[6] | 1 | // ========== Copyright Header Begin ========================================== |
---|
| 2 | // |
---|
| 3 | // OpenSPARC T1 Processor File: sparc_exu_ecc.v |
---|
| 4 | // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. |
---|
| 5 | // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. |
---|
| 6 | // |
---|
| 7 | // The above named program is free software; you can redistribute it and/or |
---|
| 8 | // modify it under the terms of the GNU General Public |
---|
| 9 | // License version 2 as published by the Free Software Foundation. |
---|
| 10 | // |
---|
| 11 | // The above named program is distributed in the hope that it will be |
---|
| 12 | // useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
| 14 | // General Public License for more details. |
---|
| 15 | // |
---|
| 16 | // You should have received a copy of the GNU General Public |
---|
| 17 | // License along with this work; if not, write to the Free Software |
---|
| 18 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
---|
| 19 | // |
---|
| 20 | // ========== Copyright Header End ============================================ |
---|
| 21 | //////////////////////////////////////////////////////////////////////// |
---|
| 22 | /* |
---|
| 23 | // Module Name: sparc_exu_ecc |
---|
| 24 | // Description: This block performs the ecc check and correction as well as |
---|
| 25 | // doing the w2 write port arbitration and the w2 ecc generation. |
---|
| 26 | */ |
---|
| 27 | module sparc_exu_ecc (/*AUTOARG*/ |
---|
| 28 | // Outputs |
---|
| 29 | so, ecc_ecl_rs1_ce, ecc_ecl_rs1_ue, ecc_ecl_rs2_ce, |
---|
| 30 | ecc_ecl_rs2_ue, ecc_ecl_rs3_ce, ecc_ecl_rs3_ue, |
---|
| 31 | ecc_byp_ecc_result_m, exu_ifu_err_synd_m, |
---|
| 32 | // Inputs |
---|
| 33 | rclk, se, si, byp_ecc_rcc_data_e, ecl_ecc_rs1_use_rf_e, |
---|
| 34 | byp_ecc_rs1_synd_d, byp_alu_rs2_data_e, ecl_ecc_rs2_use_rf_e, |
---|
| 35 | byp_ecc_rs2_synd_d, byp_ecc_rs3_data_e, ecl_ecc_rs3_use_rf_e, |
---|
| 36 | byp_ecc_rs3_synd_d, ecl_ecc_sel_rs1_m_l, ecl_ecc_sel_rs2_m_l, |
---|
| 37 | ecl_ecc_sel_rs3_m_l, ecl_ecc_log_rs1_m, ecl_ecc_log_rs2_m, |
---|
| 38 | ecl_ecc_log_rs3_m |
---|
| 39 | ) ; |
---|
| 40 | input rclk; |
---|
| 41 | input se; |
---|
| 42 | input si; |
---|
| 43 | input [63:0] byp_ecc_rcc_data_e; |
---|
| 44 | input ecl_ecc_rs1_use_rf_e; |
---|
| 45 | input [7:0] byp_ecc_rs1_synd_d; |
---|
| 46 | input [63:0] byp_alu_rs2_data_e; |
---|
| 47 | input ecl_ecc_rs2_use_rf_e; |
---|
| 48 | input [7:0] byp_ecc_rs2_synd_d; |
---|
| 49 | input [63:0] byp_ecc_rs3_data_e; |
---|
| 50 | input ecl_ecc_rs3_use_rf_e; |
---|
| 51 | input [7:0] byp_ecc_rs3_synd_d; |
---|
| 52 | input ecl_ecc_sel_rs1_m_l; |
---|
| 53 | input ecl_ecc_sel_rs2_m_l; |
---|
| 54 | input ecl_ecc_sel_rs3_m_l; |
---|
| 55 | input ecl_ecc_log_rs1_m; |
---|
| 56 | input ecl_ecc_log_rs2_m; |
---|
| 57 | input ecl_ecc_log_rs3_m; |
---|
| 58 | |
---|
| 59 | output so; |
---|
| 60 | output ecc_ecl_rs1_ce; |
---|
| 61 | output ecc_ecl_rs1_ue; |
---|
| 62 | output ecc_ecl_rs2_ce; |
---|
| 63 | output ecc_ecl_rs2_ue; |
---|
| 64 | output ecc_ecl_rs3_ce; |
---|
| 65 | output ecc_ecl_rs3_ue; |
---|
| 66 | |
---|
| 67 | output [63:0] ecc_byp_ecc_result_m; |
---|
| 68 | output [6:0] exu_ifu_err_synd_m; |
---|
| 69 | |
---|
| 70 | wire clk; |
---|
| 71 | wire sel_rs1_m; |
---|
| 72 | wire sel_rs2_m; |
---|
| 73 | wire sel_rs3_m; |
---|
| 74 | wire [7:0] rs1_ecc_e; |
---|
| 75 | wire [6:0] rs1_err_e; // syndrome generated by checker |
---|
| 76 | wire [6:0] rs1_err_m; // syndrome generated by checker |
---|
| 77 | wire [7:0] rs2_ecc_e; |
---|
| 78 | wire [6:0] rs2_err_e; // syndrome generated by checker |
---|
| 79 | wire [6:0] rs2_err_m; // syndrome generated by checker |
---|
| 80 | wire [7:0] rs3_ecc_e; |
---|
| 81 | wire [6:0] rs3_err_e; // syndrome generated by checker |
---|
| 82 | wire [6:0] rs3_err_m; // syndrome generated by checker |
---|
| 83 | wire [6:0] err_m; |
---|
| 84 | wire [63:0] ecc_datain_m; |
---|
| 85 | wire [63:0] byp_ecc_rcc_data_m; |
---|
| 86 | wire [63:0] byp_alu_rs2_data_m; |
---|
| 87 | wire [63:0] exu_lsu_rs3_data_m; |
---|
| 88 | wire [63:0] error_data_m; |
---|
| 89 | |
---|
| 90 | assign clk = rclk; |
---|
| 91 | // Pass along ecc parity bits from RF |
---|
| 92 | dff_s #(8) rs1_ecc_d2e(.din(byp_ecc_rs1_synd_d[7:0]), .clk(clk), .q(rs1_ecc_e[7:0]), |
---|
| 93 | .se(se), .si(), .so()); |
---|
| 94 | dff_s #(8) rs2_ecc_d2e(.din(byp_ecc_rs2_synd_d[7:0]), .clk(clk), .q(rs2_ecc_e[7:0]), |
---|
| 95 | .se(se), .si(), .so()); |
---|
| 96 | dff_s #(8) rs3_ecc_d2e(.din(byp_ecc_rs3_synd_d[7:0]), .clk(clk), .q(rs3_ecc_e[7:0]), |
---|
| 97 | .se(se), .si(), .so()); |
---|
| 98 | |
---|
| 99 | // Check the ecc for all 4 outputs from RF |
---|
| 100 | zzecc_exu_chkecc2 chk_rs1(.d(byp_ecc_rcc_data_e[63:0]), |
---|
| 101 | .vld(ecl_ecc_rs1_use_rf_e), |
---|
| 102 | .p(rs1_ecc_e[7:0]), |
---|
| 103 | .q(rs1_err_e[6:0]), |
---|
| 104 | .ce(ecc_ecl_rs1_ce), .ue(ecc_ecl_rs1_ue), .ne()); |
---|
| 105 | zzecc_exu_chkecc2 chk_rs2(.d(byp_alu_rs2_data_e[63:0]), |
---|
| 106 | .vld(ecl_ecc_rs2_use_rf_e), |
---|
| 107 | .p(rs2_ecc_e[7:0]), |
---|
| 108 | .q(rs2_err_e[6:0]), |
---|
| 109 | .ce(ecc_ecl_rs2_ce), .ue(ecc_ecl_rs2_ue), .ne()); |
---|
| 110 | zzecc_exu_chkecc2 chk_rs3(.d(byp_ecc_rs3_data_e[63:0]), |
---|
| 111 | .vld(ecl_ecc_rs3_use_rf_e), |
---|
| 112 | .p(rs3_ecc_e[7:0]), |
---|
| 113 | .q(rs3_err_e[6:0]), |
---|
| 114 | .ce(ecc_ecl_rs3_ce), .ue(ecc_ecl_rs3_ue), .ne()); |
---|
| 115 | |
---|
| 116 | // Put results from checkers into flops |
---|
| 117 | dff_s #(7) rs1_err_e2m(.din(rs1_err_e[6:0]), .clk(clk), .q(rs1_err_m[6:0]), |
---|
| 118 | .se(se), .si(), .so()); |
---|
| 119 | dff_s #(7) rs2_err_e2m(.din(rs2_err_e[6:0]), .clk(clk), .q(rs2_err_m[6:0]), |
---|
| 120 | .se(se), .si(), .so()); |
---|
| 121 | dff_s #(7) rs3o_err_e2m(.din(rs3_err_e[6:0]), .clk(clk), .q(rs3_err_m[6:0]), |
---|
| 122 | .se(se), .si(), .so()); |
---|
| 123 | |
---|
| 124 | // Pass along RF data to M stage |
---|
| 125 | dff_s #(64) rs1_data_e2m(.din(byp_ecc_rcc_data_e[63:0]), .clk(clk), .q(byp_ecc_rcc_data_m[63:0]), |
---|
| 126 | .se(se), .si(), .so()); |
---|
| 127 | dff_s #(64) rs2_data_e2m(.din(byp_alu_rs2_data_e[63:0]), .clk(clk), .q(byp_alu_rs2_data_m[63:0]), |
---|
| 128 | .se(se), .si(), .so()); |
---|
| 129 | dff_s #(64) rs3_data_e2m(.din(byp_ecc_rs3_data_e[63:0]), .clk(clk), |
---|
| 130 | .q(exu_lsu_rs3_data_m[63:0]), |
---|
| 131 | .se(se), .si(), .so()); |
---|
| 132 | |
---|
| 133 | // Mux between 3 different ports for syndrome and data |
---|
| 134 | assign sel_rs1_m = ~ecl_ecc_sel_rs1_m_l; |
---|
| 135 | assign sel_rs2_m = ~ecl_ecc_sel_rs2_m_l; |
---|
| 136 | assign sel_rs3_m = ~ecl_ecc_sel_rs3_m_l; |
---|
| 137 | mux3ds #(7) syn_mux(.dout(err_m[6:0]), |
---|
| 138 | .in0(rs1_err_m[6:0]), |
---|
| 139 | .in1(rs2_err_m[6:0]), |
---|
| 140 | .in2(rs3_err_m[6:0]), |
---|
| 141 | .sel0(sel_rs1_m), |
---|
| 142 | .sel1(sel_rs2_m), |
---|
| 143 | .sel2(sel_rs3_m)); |
---|
| 144 | mux3ds #(64) data_m_mux(.dout(ecc_datain_m[63:0]), |
---|
| 145 | .in0(byp_ecc_rcc_data_m[63:0]), |
---|
| 146 | .in1(byp_alu_rs2_data_m[63:0]), |
---|
| 147 | .in2(exu_lsu_rs3_data_m[63:0]), |
---|
| 148 | .sel0(sel_rs1_m), |
---|
| 149 | .sel1(sel_rs2_m), |
---|
| 150 | .sel2(sel_rs3_m)); |
---|
| 151 | |
---|
| 152 | mux3ds #(7) syn_log_mux(.dout(exu_ifu_err_synd_m[6:0]), |
---|
| 153 | .in0(rs1_err_m[6:0]), |
---|
| 154 | .in1(rs2_err_m[6:0]), |
---|
| 155 | .in2(rs3_err_m[6:0]), |
---|
| 156 | .sel0(ecl_ecc_log_rs1_m), |
---|
| 157 | .sel1(ecl_ecc_log_rs2_m), |
---|
| 158 | .sel2(ecl_ecc_log_rs3_m)); |
---|
| 159 | // Decode syndrome from checker |
---|
| 160 | sparc_exu_ecc_dec decode(.e (error_data_m[63:0]), |
---|
| 161 | .q (err_m[6:0])); |
---|
| 162 | assign ecc_byp_ecc_result_m[63:0] = ecc_datain_m[63:0] ^ error_data_m[63:0]; |
---|
| 163 | |
---|
| 164 | |
---|
| 165 | endmodule // sparc_exu_ecc |
---|