source: XOpenSparcT1/trunk/os2wb/os2wb.v @ 33

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:  (C) Athree, 2009
// Engineer: Dmitry Rozhdestvenskiy 
// Email dmitry.rozhdestvenskiy@srisc.com dmitryr@a3.spb.ru divx4log@narod.ru
// 
// Design Name:    Bridge from SPARC Core to Wishbone Master
// Module Name:    os2wb 
// Project Name:   SPARC SoC single-core
//
// LICENSE:
// This is a Free Hardware Design; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
// The above named program is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
//////////////////////////////////////////////////////////////////////////////////
module os2wb(
    input              clk,
    input              rstn,
    
    // Core interface 
    input      [  4:0] pcx_req, 
    input              pcx_atom,
    input      [123:0] pcx_data, 
    
    output reg [  4:0] pcx_grant,
    output reg         cpx_ready,
    output reg [144:0] cpx_packet,
    
    // Wishbone master interface
    input      [ 63:0] wb_data_i,
    input              wb_ack,
    output reg         wb_cycle,
    output reg         wb_strobe,
    output reg         wb_we,
    output reg [  7:0] wb_sel,
    output reg [ 63:0] wb_addr,
    output reg [ 63:0] wb_data_o,
    
    // FPU interface
    output reg [123:0] fp_pcx,
    output reg         fp_req,
    input      [144:0] fp_cpx,
    input              fp_rdy,
    
    // Ethernet interrupt, sensed on posedge, mapped to vector 'd29
    input              eth_int
);

reg [123:0] pcx_packet_d;    // Latched incoming PCX packet
reg [123:0] pcx_packet_2nd;  // Second packet for atomic (CAS)
reg [  4:0] pcx_req_d;       // Latched request
reg         pcx_atom_d;      // Latched atomic flasg
reg [  4:0] state;           // FSM state
reg [144:0] cpx_packet_1;    // First CPX packet
reg [144:0] cpx_packet_2;    // Second CPX packet (for atomics and cached IFILLs)
reg         cpx_two_packet;  // CPX answer is two-packet (!=atomic, SWAP has atomic==0 and answer is two-packet)

reg  [ 3:0] inval_vect0; // Invalidate, instr/data, way
reg  [ 3:0] inval_vect1; // IFill may cause two D lines invalidation at a time

wire [111:0] store_inv_vec; // Store invalidation vector

assign store_inv_vec[111:91]=0;
assign store_inv_vec[90:88]=((pcx_packet_d[64+5:64+4]==2'b11) && inval_vect0[3:2]==2'b11) ? {inval_vect0[1:0],1'b1}:3'b000;
assign store_inv_vec[87:60]=0;
assign store_inv_vec[59:56]=((pcx_packet_d[64+5:64+4]==2'b10) && inval_vect0[3:2]==2'b11) || ((pcx_packet_d[64+5]==1'b1) && inval_vect0[3:2]==2'b10) ? {inval_vect0[1:0],!inval_vect0[2],inval_vect0[2]}:4'b0000;
assign store_inv_vec[55:35]=0;
assign store_inv_vec[34:32]=((pcx_packet_d[64+5:64+4]==2'b01) && inval_vect0[3:2]==2'b11) ? {inval_vect0[1:0],1'b1}:3'b000;
assign store_inv_vec[31:4]=0;
assign store_inv_vec[3:0]=((pcx_packet_d[64+5:64+4]==2'b00) && inval_vect0[3:2]==2'b11) || ((pcx_packet_d[64+5]==1'b0) && inval_vect0[3:2]==2'b10) ? {inval_vect0[1:0],!inval_vect0[2],inval_vect0[2]}:4'b0000;

wire [28:0] dcache0_do0;
wire [28:0] dcache0_do1;
wire [28:0] dcache1_do0;
wire [28:0] dcache1_do1;
wire [28:0] dcache2_do0;
wire [28:0] dcache2_do1;
wire [28:0] dcache3_do0;
wire [28:0] dcache3_do1;
wire [28:0] icache0_do;
wire [28:0] icache1_do;
wire [28:0] icache2_do;
wire [28:0] icache3_do;

`define TEST_DRAM_1      5'b00000
`define TEST_DRAM_2      5'b00001
`define TEST_DRAM_3      5'b00010
`define TEST_DRAM_4      5'b00011
`define INIT_DRAM_1      5'b00100
`define INIT_DRAM_2      5'b00101
`define WAKEUP           5'b00110
`define PCX_IDLE         5'b00111
`define GOT_PCX_REQ      5'b01000
`define PCX_REQ_2ND      5'b01001
`define PCX_REQ_STEP1    5'b01010
`define PCX_REQ_STEP1_1  5'b01011
`define PCX_REQ_STEP2    5'b01100
`define PCX_REQ_STEP2_1  5'b01101
`define PCX_REQ_STEP3    5'b01110
`define PCX_REQ_STEP3_1  5'b01111
`define PCX_REQ_STEP4    5'b10000
`define PCX_REQ_STEP4_1  5'b10001
`define PCX_BIS          5'b10010
`define PCX_BIS_1        5'b10011
`define PCX_BIS_2        5'b10100
`define CPX_READY_1      5'b10101
`define CPX_READY_2      5'b10110
`define PCX_UNKNOWN      5'b11000
`define PCX_FP_1         5'b11001
`define PCX_FP_2         5'b11010
`define FP_WAIT          5'b11011
`define CPX_FP           5'b11100
`define CPX_SEND_ETH_IRQ 5'b11101
`define CPX_INT_VEC_DIS  5'b11110
`define PCX_REQ_CAS_COMPARE 5'b11111

//`define MEM_SIZE         64'h00000000_10000000 //256 MB
//`define MEM_SIZE         64'h00000000_00100000  //1MB
`define MEM_SIZE         64'h00000000_00001000  //16KB

// sal: escludo test della DRAM `define TEST_DRAM        1
`define TEST_DRAM        0
`define DEBUGGING        1

reg        cache_init;
wire [3:0] dcache0_hit;
wire [3:0] dcache1_hit;
wire [3:0] icache_hit;
reg        multi_hit;
reg        multi_hit1;
reg        eth_int_d;
reg        eth_int_send;
reg        eth_int_sent;
reg  [3:0] cnt;

// PCX channel FIFO
wire [129:0] pcx_data_fifo;
wire         pcx_fifo_empty;
reg  [  4:0] pcx_req_1;
reg  [  4:0] pcx_req_2;
reg          pcx_atom_1;
reg          pcx_atom_2;
reg          pcx_data_123_d;

always @(posedge clk)
   begin
      pcx_req_1<=pcx_req;
      pcx_atom_1<=pcx_atom;
      pcx_atom_2<=pcx_atom_1;
      pcx_req_2<=pcx_atom_1 ? pcx_req_1:5'b0;
      pcx_grant<=(pcx_req_1 | pcx_req_2);
      pcx_data_123_d<=pcx_data[123];
   end
        
/*pcx_fifo pcx_fifo_inst( 
       // FIFO should be first word fall-through
       // It has no full flag as the core will send only limited number of requests,
       // in original design we used it 32 words deep
       // Just make it deeper if you experience overflow - 
       // you can't just send no grant on full because the core expects immediate
       // grant for at least two requests for each zone
    .aclr(!rstn),
    .clock(clk),
    .data({pcx_atom_1,pcx_req_1,pcx_data}),
    .rdreq(fifo_rd),
    .wrreq((pcx_req_1!=5'b00000 && pcx_data[123]) || (pcx_atom_2 && pcx_data_123_d)), 
       // Second atomic packet for FPU may be invalid, but should be sent to FPU
       // so if the first atomic packet is valid we latch both
    .empty(pcx_fifo_empty),
    .q(pcx_data_fifo)
);
*/
reg fifo_rd;
wire [123:0] pcx_packet;


pcx_fifo pcx_fifo_inst( 
    .clk(clk),
    .rst(!rstn),
    .din({pcx_atom_1,pcx_req_1,pcx_data}),
    .rd_en(fifo_rd),
    .wr_en((pcx_req_1!=5'b00000 && pcx_data[123]) || (pcx_atom_2 && pcx_data_123_d)), 
    .empty(pcx_fifo_empty),
    .full(),
    .dout(pcx_data_fifo)
);
        


// --------------------------

always @(posedge clk or negedge rstn)
   if(!rstn)
      eth_int_send<=0;
   else
      begin
         eth_int_d<=eth_int;
         if(eth_int && !eth_int_d)
            eth_int_send<=1;
         else
            if(eth_int_sent)
               eth_int_send<=0;
      end


assign pcx_packet=pcx_data_fifo[123:0];

always @(posedge clk or negedge rstn)
   if(rstn==0)
      begin
         //$display("INFO: OS2WB: RST_DRAM at %t",$time);
         if(`TEST_DRAM)
            state<=`TEST_DRAM_1;
         else
         state<=`INIT_DRAM_1; // DRAM initialization is mandatory!
         cpx_ready<=0;
         fifo_rd<=0;
         cpx_packet<=145'b0;
         wb_cycle<=0;
         wb_strobe<=0;
         wb_we<=0;
         wb_sel<=0;
         wb_addr<=64'b0;
         wb_data_o<=64'b0;
         pcx_packet_d<=124'b0;
         fp_pcx<=124'b0;
         fp_req<=0;
      end
   else
      case(state)
         `TEST_DRAM_1:
            begin
               //$display("INFO: OS2WB: TEST_DRAM_1");
               wb_cycle<=1;
               wb_strobe<=1;
               wb_sel<=8'hFF;
               wb_we<=1;
               state<=`TEST_DRAM_2;
            end
         `TEST_DRAM_2:
            if(wb_ack)
               begin
               //$display("INFO: OS2WB: TEST_DRAM_2 at time %d with wb_addr=%x",$time,wb_addr);
                  wb_strobe<=0;
                  if(wb_addr<`MEM_SIZE-8)
                     begin
                        wb_addr[31:0]<=wb_addr[31:0]+8;
                        wb_data_o<={wb_addr[31:0]+8,wb_addr[31:0]+8};
                        state<=`TEST_DRAM_1;
                     end
                  else
                     begin
                        state<=`TEST_DRAM_3;
                        wb_cycle<=0;
                        wb_sel<=0;
                        wb_we<=0;
                        wb_data_o<=64'b0;
                        wb_addr<=64'b0;
                     end
               end               
         `TEST_DRAM_3:
            begin
               //$display("INFO: OS2WB: TEST_DRAM_3");
               wb_cycle<=1;
               wb_strobe<=1;
               wb_sel<=8'hFF;
               state<=`TEST_DRAM_4;
            end
         `TEST_DRAM_4:
            if(wb_ack)
               begin
                 // $display("INFO: OS2WB: TEST_DRAM_4 at %t",$time);
                  wb_strobe<=0;
                  if(wb_addr<`MEM_SIZE-8)
                     begin
                        //if(wb_data_i=={wb_addr[31:0],wb_addr[31:0]})
                        //   begin
                              wb_addr[31:0]<=wb_addr[31:0]+8;
                              state<=`TEST_DRAM_3;
                        //   end
                        //else 
                        //   $display("expected %x, obtained  %x",{wb_addr[31:0],wb_addr[31:0]},wb_data_i);
                     end
                  else
                     begin
                        //$display("INFO: OS2WB: INIT_DRAM at %t",$time);
                        state<=`INIT_DRAM_1;
                        wb_cycle<=0;
                        wb_sel<=0;
                        wb_we<=0;
                        wb_data_o<=64'b0;
                        wb_addr<=64'b0;
                     end
               end               
         `INIT_DRAM_1:
            begin
               wb_cycle<=1;
               wb_strobe<=1;
               wb_sel<=8'hFF;
               wb_we<=1;
               cache_init<=1; // We also init cache directories here
               state<=`INIT_DRAM_2;
            end
         `INIT_DRAM_2:
            if(wb_ack)
               begin
                  wb_strobe<=0;
                  if(wb_addr<`MEM_SIZE-8)
                     begin
                        //for debug 
                        //  if (wb_addr[10:3]==8'b0) 
                        //      $display("INFO: OS2WB: INIT_DRAM_2 at time %d with wb_addr=%x",$time,wb_addr);
                        //
                        wb_addr[31:0]<=wb_addr[31:0]+8;
                        pcx_packet_d[64+11:64+4]<=pcx_packet_d[64+11:64+4]+1; // Address for cachedir init
                        state<=`INIT_DRAM_1;
                     end
                  else
                     begin
                        //$display("INFO: OS2WB: WAKEUP_DRAM at %t",$time);
                        state<=`WAKEUP;
                        wb_cycle<=0;
                        wb_sel<=0;
                        wb_we<=0;
                        cache_init<=0;
                        wb_addr<=64'b0;
                     end
               end               
         `WAKEUP:
            begin
               cpx_packet<=145'h1700000000000000000000000000000010001;
               cpx_ready<=1;
               state<=`PCX_IDLE;
            end
         `PCX_IDLE:
            begin
               cnt<=0;
               cpx_packet<=145'b0;
               cpx_ready<=0;
               cpx_two_packet<=0;
               //inval_vect0[3]<=0;
               //inval_vect1[3]<=0;
               inval_vect0<=0;
               inval_vect1<=0;
               multi_hit<=0;
               multi_hit1<=0;
               if(eth_int_send)
                  begin
                     state<=`CPX_SEND_ETH_IRQ;
                     eth_int_sent<=1;
                  end
               else
                  if(!pcx_fifo_empty)
                     begin
                        pcx_req_d<=pcx_data_fifo[128:124];
                        pcx_atom_d<=pcx_data_fifo[129];
                        fifo_rd<=1;
                        state<=`GOT_PCX_REQ;
                     end
            end
         `GOT_PCX_REQ:
            begin
               pcx_packet_d<=pcx_packet;
               if(`DEBUGGING)
                  begin
                     $display("INFO: OS2WB: GOT_PCX_REQ");
                     wb_sel[1:0]<=pcx_packet[113:112];
                     wb_sel[2]<=1;
                  end
               if(pcx_packet[103:64]==40'h9800000800 && pcx_packet[122:118]==5'b00001)
                  begin
                     state<=`CPX_INT_VEC_DIS;
                     fifo_rd<=0;
                  end
               else
                  if(pcx_atom_d==0)
                     begin
                        fifo_rd<=0;
                        if(pcx_packet[122:118]==5'b01010) // FP req
                           begin
                              state<=`PCX_FP_1;
                              pcx_packet_2nd[123]<=0;
                           end
                        else
                           state<=`PCX_REQ_STEP1;
                     end
                  else
                     state<=`PCX_REQ_2ND;
            end
         `PCX_REQ_2ND:
            begin
               $display("INFO: OS2WB: GOT_PCX_REQ_2ND");
               pcx_packet_2nd<=pcx_packet; //Latch second packet for atomics
               if(`DEBUGGING)
                  if(pcx_fifo_empty)
                     wb_sel<=8'h67;
               fifo_rd<=0;
               if(pcx_packet_d[122:118]==5'b01010) // FP req
                  state<=`PCX_FP_1;
               else               
                  state<=`PCX_REQ_STEP1;
            end
         `PCX_REQ_STEP1:
            begin
               if(pcx_packet_d[111]==1'b1) // Invalidate request
                  begin
                     $display("INFO: OS2WB: INVALIDATE");
                     cpx_packet_1[144]<=1;     // Valid
                     cpx_packet_1[143:140]<=4'b0100; // Invalidate reply is Store ACK
                     cpx_packet_1[139]<=1;     // L2 miss
                     cpx_packet_1[138:137]<=0; // Error
                     cpx_packet_1[136]<=pcx_packet_d[117]; // Non-cacheble
                     cpx_packet_1[135:134]<=pcx_packet_d[113:112]; // Thread ID
                     cpx_packet_1[133:131]<=0; // Way valid
                     cpx_packet_1[130]<=((pcx_packet_d[122:118]==5'b10000) && (pcx_req_d==5'b10000)) ? 1:0; // Four byte fill
                     cpx_packet_1[129]<=pcx_atom_d;
                     cpx_packet_1[128]<=pcx_packet_d[110]; // Prefetch
                     cpx_packet_1[127:0]<={2'b0,pcx_packet_d[109]/*BIS*/,pcx_packet_d[122:118]==5'b00000 ? 2'b01:2'b10,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],112'b0};
                     state<=`CPX_READY_1;
                  end
               else
                  if(pcx_packet_d[122:118]!=5'b01001) // Not INT
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1");
                        wb_cycle<=1'b1;
                        wb_strobe<=1'b1;
                        if((pcx_packet_d[122:118]==5'b00000 && !pcx_req_d[4]) || pcx_packet_d[122:118]==5'b00010 || pcx_packet_d[122:118]==5'b00100 || pcx_packet_d[122:118]==5'b00110)
                           begin 
                            $display("INFO: OS2WB: load/streadload ecc");
                           wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+4],4'b0000}; //DRAM load/streamload, CAS and SWAP always use DRAM and load first 
                           end 
                        else
                           if(pcx_packet_d[122:118]==5'b10000 && !pcx_req_d[4])
                           begin
                              $display("INFO: OS2WB: ifill");
                              wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+5],5'b00000}; //DRAM ifill
                           end
                           else
                              if(pcx_packet_d[64+39:64+28]==12'hFFF && pcx_packet_d[64+27:64+24]!=4'b0) // flash remap FFF1->FFF8
                                 wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+3]+37'h0000E00000,3'b000};
                              else
                                 wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+3],3'b000};
                        wb_data_o<=pcx_packet_d[63:0];
                        state<=`PCX_REQ_STEP1_1;
                     end
                  else
                     if((pcx_packet_d[12:10]!=3'b000) && !pcx_packet_d[117]) // Not FLUSH int and not this core
                        state<=`PCX_IDLE; 
                     else
                        state<=`CPX_READY_1;
               case(pcx_packet_d[122:118]) // Packet type
                  5'b00000://Load
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, Load");
                        wb_we<=0;
                        if(!pcx_packet_d[110] && !pcx_packet_d[117])
                           case(icache_hit)
                              4'b0000:;
                              4'b0001:inval_vect0<=4'b1_0_00;
                              4'b0010:inval_vect0<=4'b1_0_01;
                              4'b0100:inval_vect0<=4'b1_0_10;
                              4'b1000:inval_vect0<=4'b1_0_11;
                              default:multi_hit<=1;
                           endcase
                        if(!pcx_req_d[4])
                           wb_sel<=8'b11111111; // DRAM requests are always 128 bit
                        else
                           case(pcx_packet_d[106:104]) //Size
                              3'b000://Byte
                                 case(pcx_packet_d[64+2:64])
                                    3'b000:wb_sel<=8'b10000000;
                                    3'b001:wb_sel<=8'b01000000;
                                    3'b010:wb_sel<=8'b00100000;
                                    3'b011:wb_sel<=8'b00010000;
                                    3'b100:wb_sel<=8'b00001000;
                                    3'b101:wb_sel<=8'b00000100;
                                    3'b110:wb_sel<=8'b00000010;
                                    3'b111:wb_sel<=8'b00000001;
                                 endcase
                              3'b001://Halfword
                                 case(pcx_packet_d[64+2:64+1])
                                    2'b00:wb_sel<=8'b11000000;
                                    2'b01:wb_sel<=8'b00110000;
                                    2'b10:wb_sel<=8'b00001100;
                                    2'b11:wb_sel<=8'b00000011;
                                 endcase
                              3'b010://Word
                                 wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111;
                              3'b011://Doubleword
                                 wb_sel<=8'b11111111;
                              3'b100://Quadword
                                 wb_sel<=8'b11111111;
                              3'b111://Cacheline
                                 wb_sel<=8'b11111111;
                              default:
                                 wb_sel<=8'b01011010; // Unreal eye-catching value for debug
                           endcase
                     end
                  5'b00001://Store
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, Store");
                        wb_we<=1;
                        case({icache_hit,dcache0_hit})
                           8'b00000000:;
                           8'b00000001:inval_vect0<=4'b1_1_00;
                           8'b00000010:inval_vect0<=4'b1_1_01;
                           8'b00000100:inval_vect0<=4'b1_1_10;
                           8'b00001000:inval_vect0<=4'b1_1_11;
                           8'b00010000:inval_vect0<=4'b1_0_00;
                           8'b00100000:inval_vect0<=4'b1_0_01;
                           8'b01000000:inval_vect0<=4'b1_0_10;
                           8'b10000000:inval_vect0<=4'b1_0_11;
                           default:multi_hit<=1;
                        endcase
                        if(pcx_packet_d[110:109]!=2'b00) //Block (or init) store
                           wb_sel<=8'b11111111; // Blocks are always 64 bit
                        else
                           case(pcx_packet_d[106:104]) //Size
                              3'b000://Byte
                                 case(pcx_packet_d[64+2:64])
                                    3'b000:wb_sel<=8'b10000000;
                                    3'b001:wb_sel<=8'b01000000;
                                    3'b010:wb_sel<=8'b00100000;
                                    3'b011:wb_sel<=8'b00010000;
                                    3'b100:wb_sel<=8'b00001000;
                                    3'b101:wb_sel<=8'b00000100;
                                    3'b110:wb_sel<=8'b00000010;
                                    3'b111:wb_sel<=8'b00000001;
                                 endcase
                              3'b001://Halfword
                                 case(pcx_packet_d[64+2:64+1])
                                    2'b00:wb_sel<=8'b11000000;
                                    2'b01:wb_sel<=8'b00110000;
                                    2'b10:wb_sel<=8'b00001100;
                                    2'b11:wb_sel<=8'b00000011;
                                 endcase
                              3'b010://Word
                                 wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111;
                              3'b011://Doubleword
                                 wb_sel<=8'b11111111;
                              default:
                                 if(`DEBUGGING)
                                    wb_sel<=8'b01011010; // Unreal eye-catching value for debug
                           endcase
                     end
                  5'b00010://CAS
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, CAS");
                        wb_we<=0; //Load first
                        case({icache_hit,dcache0_hit})
                           8'b00000000:;
                           8'b00000001:inval_vect0<=4'b1_1_00;
                           8'b00000010:inval_vect0<=4'b1_1_01;
                           8'b00000100:inval_vect0<=4'b1_1_10;
                           8'b00001000:inval_vect0<=4'b1_1_11;
                           8'b00010000:inval_vect0<=4'b1_0_00;
                           8'b00100000:inval_vect0<=4'b1_0_01;
                           8'b01000000:inval_vect0<=4'b1_0_10;
                           8'b10000000:inval_vect0<=4'b1_0_11;
                           default:multi_hit<=1;
                        endcase
                        wb_sel<=8'b11111111; // CAS loads are as cacheline
                     end
                  5'b00100://STRLOAD
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, STRLOAD");
                        wb_we<=0;
                        wb_sel<=8'b11111111; // Stream loads are always 128 bit
                     end
                  5'b00101://STRSTORE
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, STRSTORE");
                        wb_we<=1;
                        case({icache_hit,dcache0_hit})
                           8'b00000000:;
                           8'b00000001:inval_vect0<=4'b1_1_00;
                           8'b00000010:inval_vect0<=4'b1_1_01;
                           8'b00000100:inval_vect0<=4'b1_1_10;
                           8'b00001000:inval_vect0<=4'b1_1_11;
                           8'b00010000:inval_vect0<=4'b1_0_00;
                           8'b00100000:inval_vect0<=4'b1_0_01;
                           8'b01000000:inval_vect0<=4'b1_0_10;
                           8'b10000000:inval_vect0<=4'b1_0_11;
                           default:multi_hit<=1;
                        endcase
                        case(pcx_packet_d[106:104]) //Size
                           3'b000://Byte
                              case(pcx_packet_d[64+2:64])
                                 3'b000:wb_sel<=8'b10000000;
                                 3'b001:wb_sel<=8'b01000000;
                                 3'b010:wb_sel<=8'b00100000;
                                 3'b011:wb_sel<=8'b00010000;
                                 3'b100:wb_sel<=8'b00001000;
                                 3'b101:wb_sel<=8'b00000100;
                                 3'b110:wb_sel<=8'b00000010;
                                 3'b111:wb_sel<=8'b00000001;
                              endcase
                           3'b001://Halfword
                              case(pcx_packet_d[64+2:64+1])
                                 2'b00:wb_sel<=8'b11000000;
                                 2'b01:wb_sel<=8'b00110000;
                                 2'b10:wb_sel<=8'b00001100;
                                 2'b11:wb_sel<=8'b00000011;
                              endcase
                           3'b010://Word
                              wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111;
                           3'b011://Doubleword
                              wb_sel<=8'b11111111;
                           3'b100://Quadword
                              wb_sel<=8'b11111111;
                           3'b111://Cacheline
                              wb_sel<=8'b11111111;
                           default:
                              wb_sel<=8'b01011010; // Unreal eye-catching value for debug
                        endcase
                     end
                  5'b00110://SWAP/LDSTUB
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, SWAP/LDSTUB");
                        case({icache_hit,dcache0_hit})
                           8'b00000000:;
                           8'b00000001:inval_vect0<=4'b1_1_00;
                           8'b00000010:inval_vect0<=4'b1_1_01;
                           8'b00000100:inval_vect0<=4'b1_1_10;
                           8'b00001000:inval_vect0<=4'b1_1_11;
                           8'b00010000:inval_vect0<=4'b1_0_00;
                           8'b00100000:inval_vect0<=4'b1_0_01;
                           8'b01000000:inval_vect0<=4'b1_0_10;
                           8'b10000000:inval_vect0<=4'b1_0_11;
                           default:multi_hit<=1;
                        endcase
                        wb_we<=0; // Load first, as CAS
                        wb_sel<=8'b11111111; // SWAP/LDSTUB loads are as cacheline
                     end
                  5'b01001://INT
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, INT");
                        if(pcx_packet_d[117]) // Flush
                        cpx_packet_1<={9'h171,pcx_packet_d[113:112],11'h0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],30'h0,pcx_packet_d[17:0],46'b0,pcx_packet_d[17:0]}; //FLUSH instruction answer
                        else // Tread-to-thread interrupt
                        cpx_packet_1<={9'h170,pcx_packet_d[113:112],52'h0,pcx_packet_d[17:0],46'h0,pcx_packet_d[17:0]}; 
                                //5'b01010: FP1 - processed by separate state
                                //5'b01011: FP2 - processed by separate state
                                //5'b01101: FWDREQ - not implemented
                                //5'b01110: FWDREPL - not implemented
                     end
                  5'b10000://IFILL
                     begin
                        $display("INFO: OS2WB: PCX_REQ_STEP1, IFILL");
                        wb_we<=0;
                        if(!pcx_req_d[4]) // not I/O access
                           begin
                              case(dcache0_hit)
                                 4'b0000:;
                                 4'b0001:inval_vect0<=4'b1_1_00;
                                 4'b0010:inval_vect0<=4'b1_1_01;
                                 4'b0100:inval_vect0<=4'b1_1_10;
                                 4'b1000:inval_vect0<=4'b1_1_11;
                                 default:multi_hit<=1;
                              endcase
                              case(dcache1_hit)
                                 4'b0000:;
                                 4'b0001:inval_vect1<=4'b1_1_00;
                                 4'b0010:inval_vect1<=4'b1_1_01;
                                 4'b0100:inval_vect1<=4'b1_1_10;
                                 4'b1000:inval_vect1<=4'b1_1_11;
                                 default:multi_hit1<=1;
                              endcase
                           end
                        if(pcx_req_d[4]) // I/O access
                           wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111;
                        else
                           wb_sel<=8'b11111111;
                     end
                  default:
                     begin
                        wb_we<=0;
                        wb_sel<=8'b10101010; // Unreal eye-catching value for debug
                     end
               endcase
            end
         `PCX_REQ_STEP1_1:
            begin
               if(wb_ack)
                  begin
                     $display("INFO: OS2WB: PCX_REQ_STEP1_1 wb_addr = %x wb_data_i = %x wb_data_o =  ",wb_addr, wb_data_i,wb_data_o);
                     cpx_packet_1[144]<=1;     // Valid
                     cpx_packet_1[139]<=(pcx_packet_d[122:118]==5'b00000) || (pcx_packet_d[122:118]==5'b10000) ? 1:0; // L2 always miss on load and ifill
                     cpx_packet_1[138:137]<=0; // Error
                     cpx_packet_1[136]<=pcx_packet_d[117] || (pcx_packet_d[122:118]==5'b00001) ? 1:0; // Non-cacheble is set on store too
                     cpx_packet_1[135:134]<=pcx_packet_d[113:112]; // Thread ID
                     if((pcx_packet_d[122:118]==5'b00000 && !pcx_packet_d[117] && !pcx_packet_d[110]) || (pcx_packet_d[122:118]==5'b10000)) // Cacheble Load or IFill
                        cpx_packet_1[133:131]<={inval_vect0[3],inval_vect0[1:0]};
                     else
                        cpx_packet_1[133:131]<=3'b000; // Way valid
                     if(pcx_packet_d[122:118]==5'b00100) // Strload
                        cpx_packet_1[130]<=pcx_packet_d[106]; // A
                     else
                        if(pcx_packet_d[122:118]==5'b00101) // Stream store
                           cpx_packet_1[130]<=pcx_packet_d[108]; // A
                        else
                           cpx_packet_1[130]<=((pcx_packet_d[122:118]==5'b10000) && pcx_req_d[4]) ? 1:0; // Four byte fill
                     if(pcx_packet_d[122:118]==5'b00100) // Strload
                        cpx_packet_1[129]<=pcx_packet_d[105]; // B
                     else      
                        cpx_packet_1[129]<=pcx_atom_d || (pcx_packet_d[122:118]==5'b00110); // SWAP is single-packet but needs atom in CPX
                     cpx_packet_1[128]<=pcx_packet_d[110] && pcx_packet_d[122:118]==5'b00000; // Prefetch
                     cpx_packet_2[144]<=1;     // Valid
                     cpx_packet_2[139]<=0;     // L2 miss
                     cpx_packet_2[138:137]<=0; // Error
                     cpx_packet_2[136]<=pcx_packet_d[117] || (pcx_packet_d[122:118]==5'b00001) ? 1:0; // Non-cacheble is set on store too
                     cpx_packet_2[135:134]<=pcx_packet_d[113:112]; // Thread ID
                     if(pcx_packet_d[122:118]==5'b10000) // IFill
                        cpx_packet_2[133:131]<={inval_vect1[3],inval_vect1[1:0]};
                     else
                        cpx_packet_2[133:131]<=3'b000; // Way valid
                     cpx_packet_2[130]<=0; // Four byte fill
                     cpx_packet_2[129]<=pcx_atom_d || (pcx_packet_d[122:118]==5'b00110) || ((pcx_packet_d[122:118]==5'b10000) && !pcx_req_d[4]);
                     cpx_packet_2[128]<=0; // Prefetch
                     wb_strobe<=0;
                     wb_sel<=8'b0;
                     wb_addr<=64'b0;
                     wb_data_o<=64'b0;
                     wb_we<=0;
                     case(pcx_packet_d[122:118]) // Packet type
                        5'b00000://Load
                           begin
                              cpx_packet_1[143:140]<=4'b0000; // Type
                              if(!pcx_req_d[4])
                                 begin
                                    cpx_packet_1[127:0]<={wb_data_i,wb_data_i};   
                                    state<=`PCX_REQ_STEP2;
                                 end
                              else
                                 case(pcx_packet_d[106:104]) //Size
                                    3'b000://Byte
                                       begin
                                          case(pcx_packet_d[64+2:64])
                                             3'b000:cpx_packet_1[127:0]<={wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56],wb_data_i[63:56]};
                                             3'b001:cpx_packet_1[127:0]<={wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48],wb_data_i[55:48]};
                                             3'b010:cpx_packet_1[127:0]<={wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40],wb_data_i[47:40]};
                                             3'b011:cpx_packet_1[127:0]<={wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32],wb_data_i[39:32]};
                                             3'b100:cpx_packet_1[127:0]<={wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24],wb_data_i[31:24]};
                                             3'b101:cpx_packet_1[127:0]<={wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16],wb_data_i[23:16]};
                                             3'b110:cpx_packet_1[127:0]<={wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8],wb_data_i[15: 8]};
                                             3'b111:cpx_packet_1[127:0]<={wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0],wb_data_i[ 7: 0]};
                                          endcase                      
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1;
                                       end
                                    3'b001://Halfword
                                       begin
                                          case(pcx_packet_d[64+2:64+1])
                                             2'b00:cpx_packet_1[127:0]<={wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48],wb_data_i[63:48]};
                                             2'b01:cpx_packet_1[127:0]<={wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32],wb_data_i[47:32]};
                                             2'b10:cpx_packet_1[127:0]<={wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16],wb_data_i[31:16]};
                                             2'b11:cpx_packet_1[127:0]<={wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0],wb_data_i[15: 0]};
                                          endcase                     
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1;
                                       end
                                    3'b010://Word
                                       begin
                                          if(pcx_packet_d[64+2]==0)
                                             cpx_packet_1[127:0]<={wb_data_i[63:32],wb_data_i[63:32],wb_data_i[63:32],wb_data_i[63:32]};
                                          else
                                             cpx_packet_1[127:0]<={wb_data_i[31:0],wb_data_i[31:0],wb_data_i[31:0],wb_data_i[31:0]};
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1;
                                       end
                                    3'b011://Doubleword
                                       begin
                                          cpx_packet_1[127:0]<={wb_data_i,wb_data_i};   
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1;
                                       end
                                    3'b100://Quadword
                                       begin
                                          cpx_packet_1[127:0]<={wb_data_i,wb_data_i};   
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1; // 16 byte access to PROM should just duplicate the data
                                       end
                                    3'b111://Cacheline
                                       begin
                                          cpx_packet_1[127:0]<={wb_data_i,wb_data_i};   
                                          wb_cycle<=0;
                                          state<=`CPX_READY_1; // 16 byte access to PROM should just duplicate the data
                                       end
                                    default:
                                       begin
                                          cpx_packet_1[127:0]<={wb_data_i,wb_data_i};   
                                          wb_cycle<=0;
                                          state<=`PCX_UNKNOWN;
                                       end
                                 endcase
                           end
                        5'b00001://Store
                           begin
                              cpx_packet_1[143:140]<=4'b0100; // Type
                              cpx_packet_1[127:0]<={2'b0,pcx_packet_d[109]/*BIS*/,2'b0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],store_inv_vec};
//                              if((pcx_packet_d[110:109]==2'b01) && (pcx_packet_d[64+5:64]==0) && !inval_vect0[3] && !inval_vect1[3]) // Block init store
//                                 state<=`PCX_BIS;
//                              else
//                                 begin
                                    wb_cycle<=0;
                                    state<=`CPX_READY_1;
//                                 end
                           end
                        5'b00010://CAS
                           begin
                              cpx_packet_1[143:140]<=4'b0000; // Load return for first packet
                              cpx_packet_2[143:140]<=4'b0100; // Store ACK for second packet
                              cpx_packet_2[127:0]<={5'b0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],store_inv_vec};
                              cpx_packet_1[127:0]<={wb_data_i,wb_data_i};
                              state<=`PCX_REQ_STEP2;
                           end
                        5'b00100://STRLOAD
                           begin
                              cpx_packet_1[143:140]<=4'b0010; // Type
                              cpx_packet_1[127:0]<={wb_data_i,wb_data_i};
                              state<=`PCX_REQ_STEP2;
                           end
                        5'b00101://STRSTORE
                           begin
                              cpx_packet_1[143:140]<=4'b0110; // Type
                              cpx_packet_1[127:0]<={5'b0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],store_inv_vec};
                              wb_cycle<=0;
                              state<=`CPX_READY_1;
                           end
                        5'b00110://SWAP/LDSTUB
                           begin
                              cpx_packet_1[143:140]<=4'b0000; // Load return for first packet
                              cpx_packet_2[143:140]<=4'b0100; // Store ACK for second packet
                              cpx_packet_2[127:0]<={5'b0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],store_inv_vec};
                              cpx_packet_1[127:0]<={wb_data_i,wb_data_i};
                              state<=`PCX_REQ_STEP2; 
                           end
                        5'b10000://IFILL
                           begin
                              $display("INFO: OS2WB: PCX_REQ_STEP1_1, IFILL, wb_addr = %x wb_data_i= %x",wb_addr, wb_data_i);
                              $display("INFO: OS2WB: PCX_REQ_STEP1_1, IFILL, cpx_packet_1 = %x %x",wb_data_i,wb_data_i);
                              cpx_packet_1[143:140]<=4'b0001; // Type
                              cpx_packet_2[143:140]<=4'b0001; // Type
                              if(pcx_req_d[4]) // I/O access
                                 begin
                                    if(pcx_packet_d[64+2]==0)
                                       cpx_packet_1[127:0]<={wb_data_i[63:32],wb_data_i[63:32],wb_data_i[63:32],wb_data_i[63:32]};
                                    else
                                       cpx_packet_1[127:0]<={wb_data_i[31:0],wb_data_i[31:0],wb_data_i[31:0],wb_data_i[31:0]};
                                    state<=`CPX_READY_1;
                                    wb_cycle<=0; 
                                 end
                              else
                                 begin
                                    cpx_packet_1[127:0]<={wb_data_i,wb_data_i};
                                    state<=`PCX_REQ_STEP2;
                                 end
                           end
                        default:
                           begin
                              wb_cycle<=0;
                              state<=`PCX_UNKNOWN;
                           end
                     endcase
                  end               
               end
         `PCX_REQ_STEP2: // IFill, Load/strload, CAS, SWAP, LDSTUB - alwas load
            begin
               wb_strobe<=1'b1;
               if(pcx_packet_d[122:118]==5'b10000)
                  wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+5],5'b01000};
               else
                  wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+4],4'b1000};
               wb_sel<=8'b11111111; // It is always full width for subsequent IFill and load accesses
               state<=`PCX_REQ_STEP2_1;
            end
         `PCX_REQ_STEP2_1:
            if(wb_ack==1)
               begin
                  wb_strobe<=0;
                  wb_sel<=8'b0;
                  wb_addr<=64'b0;
                  wb_data_o<=64'b0;
                  wb_we<=0;
                  cpx_packet_1[63:0]<=wb_data_i;
                  if((pcx_packet_d[122:118]!=5'b00000) && (pcx_packet_d[122:118]!=5'b00100))
                     if(pcx_packet_d[122:118]!=5'b00010) // IFill, SWAP
                        state<=`PCX_REQ_STEP3;
                     else
                        state<=`PCX_REQ_CAS_COMPARE; // CAS
                  else
                     begin
                        wb_cycle<=0;
                        state<=`CPX_READY_1;
                     end
               end
         `PCX_REQ_CAS_COMPARE:
            begin
               cpx_two_packet<=1;
               if(pcx_packet_d[106:104]==3'b010) // 32-bit
                  case(pcx_packet_d[64+3:64+2])
                     2'b00:state<=cpx_packet_1[127:96]==pcx_packet_d[63:32] ? `PCX_REQ_STEP3:`CPX_READY_1;
                     2'b01:state<=cpx_packet_1[95:64]==pcx_packet_d[63:32] ? `PCX_REQ_STEP3:`CPX_READY_1;
                     2'b10:state<=cpx_packet_1[63:32]==pcx_packet_d[63:32] ? `PCX_REQ_STEP3:`CPX_READY_1;
                     2'b11:state<=cpx_packet_1[31:0]==pcx_packet_d[63:32] ? `PCX_REQ_STEP3:`CPX_READY_1;
                  endcase
               else
                  if(pcx_packet_d[64+3]==0)
                     state<=cpx_packet_1[127:64]==pcx_packet_d[63:0] ? `PCX_REQ_STEP3:`CPX_READY_1;
                  else
                     state<=cpx_packet_1[63:0]==pcx_packet_d[63:0] ? `PCX_REQ_STEP3:`CPX_READY_1;
            end
         `PCX_REQ_STEP3: // 256-bit IFILL; CAS, SWAP and LDSTUB store
            begin
               if(pcx_packet_d[122:118]==5'b10000)
                  wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+5],5'b10000};
               else
                  wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+3],3'b000}; // CAS or SWAP save
               cpx_two_packet<=1;
               if(pcx_packet_d[122:118]==5'b10000)
                  wb_we<=0;
               else
                  wb_we<=1;
               wb_strobe<=1'b1;
               if(pcx_packet_d[122:118]==5'b00010) // CAS
                  if(pcx_packet_d[106:104]==3'b010)
                     wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111;
                  else
                     wb_sel<=8'b11111111; //CASX
               else
                  if(pcx_packet_d[122:118]==5'b00110) //SWAP or LDSTUB
                     if(pcx_packet_d[106:104]==3'b000)  //LDSTUB
                        case(pcx_packet_d[64+2:64])
                           3'b000:wb_sel<=8'b10000000;
                           3'b001:wb_sel<=8'b01000000;
                           3'b010:wb_sel<=8'b00100000;
                           3'b011:wb_sel<=8'b00010000;
                           3'b100:wb_sel<=8'b00001000;
                           3'b101:wb_sel<=8'b00000100;
                           3'b110:wb_sel<=8'b00000010;
                           3'b111:wb_sel<=8'b00000001;
                        endcase
                     else   
                        wb_sel<=(pcx_packet_d[64+2]==0) ? 8'b11110000:8'b00001111; ///SWAP is always 32-bit
                  else
                     wb_sel<=8'b11111111; // It is always full width for subsequent IFill accesses
               if(pcx_packet_d[122:118]==5'b00110) //SWAP or LDSTUB
                  wb_data_o<={pcx_packet_d[63:32],pcx_packet_d[63:32]};
//                  wb_data_o<=pcx_packet_d[63:0];
               else
                  wb_data_o<=pcx_packet_2nd[63:0]; // CAS store second packet data
//                  if(pcx_packet_d[106:104]==3'b010)
//                     wb_data_o<={pcx_packet_2nd[63:32],pcx_packet_2nd[63:32]}; // CAS store second packet data
//                  else
//                     wb_data_o<=pcx_packet_2nd[63:0];
               state<=`PCX_REQ_STEP3_1;
            end
         `PCX_REQ_STEP3_1:
            if(wb_ack==1)
               begin
                  wb_strobe<=0;
                  wb_sel<=8'b0;
                  wb_addr<=64'b0;
                  wb_we<=0;
                  wb_data_o<=64'b0;
                  if(pcx_packet_d[122:118]==5'b10000) // IFill
                     begin
                        cpx_packet_2[127:64]<=wb_data_i;
                        state<=`PCX_REQ_STEP4;
                     end
                  else
                     begin
                        wb_cycle<=0;
                        state<=`CPX_READY_1;
                     end
               end
         `PCX_REQ_STEP4: // 256-bit IFILL only
            begin
               wb_strobe<=1'b1;
               wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+5],5'b11000};
               wb_sel<=8'b11111111; // It is always full width for subsequent accesses
               state<=`PCX_REQ_STEP4_1;
            end 
         `PCX_REQ_STEP4_1:
            if(wb_ack==1)  
               begin
                  wb_cycle<=0;
                  wb_strobe<=0;
                  wb_sel<=8'b0;
                  wb_addr<=64'b0;
                  wb_we<=0;
                  cpx_packet_2[63:0]<=wb_data_i;
                  state<=`CPX_READY_1;
               end
         `PCX_BIS: // Block init store
            begin
               wb_strobe<=1'b1;
               wb_we<=1;
               wb_addr<={pcx_req_d,19'b0,pcx_packet_d[103:64+6],6'b001000};
               wb_sel<=8'b11111111;
               wb_data_o<=64'b0;
               state<=`PCX_BIS_1;
            end
         `PCX_BIS_1:
            if(wb_ack)
               begin
                  wb_strobe<=0;
                  if(wb_addr[39:0]<(pcx_packet_d[64+39:64]+8*7))
                     state<=`PCX_BIS_2;
                  else
                     begin
                        wb_cycle<=0;
                        wb_sel<=0;
                        wb_we<=0;
                        wb_addr<=64'b0;
                        state<=`CPX_READY_1;
                     end
               end
         `PCX_BIS_2:
            begin
               wb_strobe<=1'b1;
               wb_addr[5:0]<=wb_addr[5:0]+8;
               state<=`PCX_BIS_1;
            end
         `PCX_FP_1:
            begin
               fp_pcx<=pcx_packet_d;
               fp_req<=1;
               state<=`PCX_FP_2;
               if(`DEBUGGING)
                  begin
                     wb_addr<=pcx_packet_d[103:64];
                     wb_data_o<=pcx_packet_d[63:0];
                     wb_sel<=8'h22;
                  end
            end
         `PCX_FP_2:
            begin
               fp_pcx<=pcx_packet_2nd;
               state<=`FP_WAIT;
               if(`DEBUGGING)
                  begin
                     wb_addr<=pcx_packet_2nd[103:64];
                     wb_data_o<=pcx_packet_d[63:0];
                     wb_sel<=8'h23;
                  end
            end
         `FP_WAIT:
            begin
               fp_pcx<=124'b0;
               fp_req<=0;
               if(fp_rdy)
                  state<=`CPX_FP;
               if(`DEBUGGING)
                  wb_sel<=8'h24;
            end
         `CPX_FP:
            if(fp_cpx[144]) // Packet valid
               begin               
                  cpx_packet_1<=fp_cpx;
                  state<=`CPX_READY_1;
                  if(`DEBUGGING)
                     begin
                        wb_addr<=fp_cpx[63:0];
                        wb_data_o<=fp_cpx[127:64];
                     end
               end
            else
               if(!fp_rdy)
                  state<=`FP_WAIT; // Else wait for another one if it is not here still
         `CPX_SEND_ETH_IRQ:
            begin
               cpx_packet_1<=145'h1_7_000_000000000000001D_000000000000_001D;
               eth_int_sent<=0;
               state<=`CPX_READY_1;
            end
         `CPX_INT_VEC_DIS:
            begin
               if(pcx_packet_d[12:10]==3'b000)
                  cpx_two_packet<=1; // Send interrupt only if it is for this core
               cpx_packet_1[144:140]<=5'b10100;
               cpx_packet_1[139:137]<=0;
               cpx_packet_1[136]<=1;
               cpx_packet_1[135:134]<=pcx_packet_d[113:112]; // Thread ID
               cpx_packet_1[133:130]<=0;
               cpx_packet_1[129]<=pcx_atom_d;
               cpx_packet_1[128]<=0;
               cpx_packet_1[127:0]<={5'b0,pcx_packet_d[64+5:64+4],3'b0,pcx_packet_d[64+11:64+6],112'b0};
               cpx_packet_2<={9'h170,54'h0,pcx_packet_d[17:0],46'h0,pcx_packet_d[17:0]}; 
               state<=`CPX_READY_1;
            end
         `CPX_READY_1:
            begin
               $display("INFO: OS2WB: CPX_READY_1");
               cpx_ready<=1;
               cpx_packet<=cpx_packet_1;
               cnt<=cnt+1;
               if(`DEBUGGING)
                  if(multi_hit || multi_hit1)
                     wb_sel<=8'h11;
               if(!cpx_two_packet)
                  state<=`PCX_IDLE;
               else
                  //if(cnt==4'b1111 || pcx_packet_d[103:64]!=40'h9800000800)   
                     state<=`CPX_READY_2;
            end
         `CPX_READY_2:
            begin
               $display("INFO: OS2WB: CPX_READY_2");
               cpx_ready<=1;
               cpx_packet<=cpx_packet_2;
               state<=`PCX_IDLE;
            end
         `PCX_UNKNOWN:
            begin
               $display("INFO: OS2WB: PCX_UNKNOWN");
               wb_sel<=8'b10100101; // Illegal eye-catching value for debugging
               state<=`PCX_IDLE;
            end
      endcase

/* Cache directory checking:
  Load:  allocate D if cacheable, check I, invalidate&deallocate if found
  Store: check I, invalidate&deallocate if found; check D, invalidate if found
  IFill: allocate I if cacheable, check D, invalidate&deallocate if found
  SWAP/LDSTUB:  check I, invalidate&deallocate if found; check D, invalidate&deallocate if found
  CAS: Like SWAP
  
  Allocation and querying is made simultaneously at GOT_PCX_REQ
     (memory read mode does not matter as long as allocation and invalidation
      are never made to the same directory, so if memory is written its output will not be checked)
  Invalidation vectors are built during PCX_REQ_STEP1, or Invalidate all ways issued
  During PCX_REQ_STEP1_1 directory is deallocated if needed
  
*/

// Directory enable
assign dir_en=((state==`GOT_PCX_REQ) || (state==`PCX_REQ_STEP1) || cache_init ||
              ((state==`PCX_REQ_STEP1_1) && wb_ack)) ? 1:0;

// ICache deallocation flag
assign loadstore=((pcx_packet_d[122:118]==5'b00000) && !pcx_packet_d[117] && !pcx_packet_d[110]) || // cacheable load, not prefetch
                 (pcx_packet_d[122:118]==5'b00001) || (pcx_packet_d[122:118]==5'b00010) || //  Store, CAS
                 (pcx_packet_d[122:118]==5'b00110) || (pcx_packet_d[122:118]==5'b00101); // SWAP/LDSTUB, StrStore 

// DCache deallocation flag                 
assign ifillcas=(pcx_packet_d[122:118]==5'b00110) || (pcx_packet_d[122:118]==5'b00010) || //SWAP, CAS
                (pcx_packet_d[122:118]==5'b10000) || (pcx_packet_d[122:118]==5'b00101) || // IFill, StrStore
                ((pcx_packet_d[122:118]==5'b00001) && pcx_packet_d[110:109]!=2'b00); // Block (or init) store

// DCache allocation flag
assign cacheload=(pcx_packet[122:118]==5'b00000) && !pcx_packet[110] && !pcx_packet[117] && !pcx_packet[111];

// ICache allocation flag
assign cacheifill=(pcx_packet[122:118]==5'b10000) && !pcx_packet[117] && !pcx_packet[111];

assign dcache0_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b00) && cacheload;
assign dcache0_dealloc0=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_1_00) && ifillcas;
assign dcache0_dealloc1=(state==`PCX_REQ_STEP1_1) && (inval_vect1==4'b1_1_00) && ifillcas;

assign dcache1_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b01) && cacheload;
assign dcache1_dealloc0=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_1_01) && ifillcas;
assign dcache1_dealloc1=(state==`PCX_REQ_STEP1_1) && (inval_vect1==4'b1_1_01) && ifillcas;

assign dcache2_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b10) && cacheload;
assign dcache2_dealloc0=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_1_10) && ifillcas;
assign dcache2_dealloc1=(state==`PCX_REQ_STEP1_1) && (inval_vect1==4'b1_1_10) && ifillcas;

assign dcache3_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b11) && cacheload;
assign dcache3_dealloc0=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_1_11) && ifillcas;
assign dcache3_dealloc1=(state==`PCX_REQ_STEP1_1) && (inval_vect1==4'b1_1_11) && ifillcas;

assign icache0_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b00) && cacheifill;
assign icache0_dealloc=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_0_00) && loadstore;

assign icache1_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b01) && cacheifill;
assign icache1_dealloc=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_0_01) && loadstore;

assign icache2_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b10) && cacheifill;
assign icache2_dealloc=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_0_10) && loadstore;

assign icache3_alloc=(state==`GOT_PCX_REQ) && (pcx_packet[108:107]==2'b11) && cacheifill;
assign icache3_dealloc=(state==`PCX_REQ_STEP1_1) && (inval_vect0==4'b1_0_11) && loadstore;

assign dcache_inval_all=(state==`PCX_REQ_STEP1) && pcx_packet_d[111] && pcx_packet_d[122:118]==5'b00000;
assign icache_inval_all=(state==`PCX_REQ_STEP1) && pcx_packet_d[111] && pcx_packet_d[122:118]==5'b10000;

`define INVAL_TAG 29'h10000000

// DCache least address bit for first bank
// it should be 0 for IFill (1 is hardcoded for second bank)
assign dcache_la=(state==`GOT_PCX_REQ) ? (pcx_packet[122:118]==5'b10000 ? 1'b0:pcx_packet[64+4]):
                 (pcx_packet_d[122:118]==5'b10000 ? 1'b0:pcx_packet_d[64+4]);

wire [ 6:0] dcache_index;
wire [28:0] dcache_data;
assign dcache_index=(state==`GOT_PCX_REQ) ? pcx_packet[64+10:64+5]:pcx_packet_d[64+10:64+5];
assign dcache_data=(state==`GOT_PCX_REQ) ? pcx_packet[64+39:64+11]:`INVAL_TAG;

cachedir dcache0 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(dcache0_alloc || dcache0_dealloc0 || dcache_inval_all || cache_init),
   .address_a({1'b0,dcache_index,dcache_la}),
   .data_a(dcache_data),
   .q_a(dcache0_do0),
  
   .wren_b(dcache0_dealloc1),
   .address_b({1'b0,dcache_index,1'b1}),
   .data_b(`INVAL_TAG),
   .q_b(dcache0_do1) 
);

cachedir dcache1 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(dcache1_alloc || dcache1_dealloc0 || dcache_inval_all || cache_init),
   .address_a({1'b0,dcache_index,dcache_la}),
   .data_a(dcache_data),
   .q_a(dcache1_do0),
   
   .wren_b(dcache1_dealloc1),
   .address_b({1'b0,dcache_index,1'b1}),
   .data_b(`INVAL_TAG),
   .q_b(dcache1_do1) 
);

cachedir dcache2 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(dcache2_alloc || dcache2_dealloc0 || dcache_inval_all || cache_init),
   .address_a({1'b0,dcache_index,dcache_la}),
   .data_a(dcache_data),
   .q_a(dcache2_do0),
   
   .wren_b(dcache2_dealloc1),
   .address_b({1'b0,dcache_index,1'b1}),
   .data_b(`INVAL_TAG),
   .q_b(dcache2_do1) 
);

cachedir dcache3 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(dcache3_alloc || dcache3_dealloc0 || dcache_inval_all || cache_init),
   .address_a({1'b0,dcache_index,dcache_la}),
   .data_a(dcache_data),
   .q_a(dcache3_do0),
   
   .wren_b(dcache3_dealloc1),
   .address_b({1'b0,dcache_index,1'b1}),
   .data_b(`INVAL_TAG),
   .q_b(dcache3_do1) 
);

assign dcache0_hit={dcache3_do0==pcx_packet_d[64+39:64+11],
                    dcache2_do0==pcx_packet_d[64+39:64+11],
                    dcache1_do0==pcx_packet_d[64+39:64+11],
                    dcache0_do0==pcx_packet_d[64+39:64+11]};
assign dcache1_hit={dcache3_do1==pcx_packet_d[64+39:64+11],
                    dcache2_do1==pcx_packet_d[64+39:64+11],
                    dcache1_do1==pcx_packet_d[64+39:64+11],
                    dcache0_do1==pcx_packet_d[64+39:64+11]};

wire [ 6:0] icache_index;
wire [28:0] icache_data;
assign icache_index=(state==`GOT_PCX_REQ) ? pcx_packet[64+11:64+5]:pcx_packet_d[64+11:64+5];
assign icache_data=(state==`GOT_PCX_REQ) ? {pcx_packet[64+39:64+12],1'b0}:`INVAL_TAG;

cachedir icache01 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(icache0_alloc || icache0_dealloc || icache_inval_all || cache_init),
   .address_a({2'b00,icache_index}),
   .data_a(icache_data),
   .q_a(icache0_do),
   
   .wren_b(icache1_alloc || icache1_dealloc || icache_inval_all || cache_init),
   .address_b({2'b01,icache_index}),
   .data_b(icache_data),
   .q_b(icache1_do) 
);

cachedir icache23 (
   .clock(clk),
   .enable(dir_en),
   .wren_a(icache2_alloc || icache2_dealloc || icache_inval_all || cache_init),
   .address_a({2'b00,icache_index}),
   .data_a(icache_data),
   .q_a(icache2_do),
   
   .wren_b(icache3_alloc || icache3_dealloc || icache_inval_all || cache_init),
   .address_b({2'b01,icache_index}),
   .data_b(icache_data),
   .q_b(icache3_do) 
);

assign icache_hit={icache3_do[28:1]==pcx_packet_d[64+39:64+12],
                   icache2_do[28:1]==pcx_packet_d[64+39:64+12],
                   icache1_do[28:1]==pcx_packet_d[64+39:64+12],
                   icache0_do[28:1]==pcx_packet_d[64+39:64+12]};

/*
               case(pcx_packet_d[122:118]) // Packet type
                  5'b00000://Load
                  5'b00001://Store
                  5'b00010://CAS
                  5'b00100://STRLOAD
                  5'b00101://STRSTORE
                  5'b00110://SWAP
                  5'b01001://INT
                  //5'b01010://FP1
                  //5'b01011://FP2
                  //5'b01101://FWDREQ
                  //5'b01110://FWDREPL
                  5'b10000://IFILL
               endcase
*/
endmodule