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sparc_ifu_fdp.v @ 6

Revision 6, 41.7 KB checked in by pntsvt00, 14 years ago (diff)
versione iniziale opensparc

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1	// ========== Copyright Header Begin ==========================================
2	//
3	// OpenSPARC T1 Processor File: sparc_ifu_fdp.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_ifu_fdp
24	// Description:
25	// The fdp contains the pc's for all four threads and the PC and
26	// nPC for all pipestages register. The fetcher also contains two
27	// adders for doing PC + br_offset and PC + 4.
28	// The fdp also holds the last fetched icache data for each thread
29	// and the next instruction register, which has the top half of the
30	// double instruction bundle which is fetched from the icache.
31	*/
32	////////////////////////////////////////////////////////////////////////
33	// Local header file includes / local defines
34	////////////////////////////////////////////////////////////////////////
35	`include "ifu.h"
36
37	`define NOP 32'h01000000
38	`define PO_RESET_PC 48'hfffff0000020
39	`define VER_MANUF 16'h003e
40	`define VER_IMPL 16'h0023
41	`define VER_MAXGL 8'h03
42	`define VER_MAXWIN 8'h07
43	`define VER_MAXTL 8'h06
44
45	//`define VER_MAXTL {5'b0, fcl_fdp_hprivmode_e, 2'b10}
46	//`define VER_IMPL_MASK 24'h002301
47
48	//`define VERSION_REG_HPV {`VER_MANUF, `VER_IMPL_MASK, `VER_MAXGL, 5'b0, fcl_fdp_hprivmode_e, 2'b10, `VER_MAXWIN}
49
50	//`define VERSION_REG {`VER_MANUF, `VER_IMPL_MASK, `VER_MAXGL, 8'h06, `VER_MAXWIN}
51
52	//FPGA_SYN enables all FPGA related modifications
53	`ifdef FPGA_SYN
54	`define FPGA_SYN_CLK_EN
55	`define FPGA_SYN_CLK_DFF
56	`endif
57
58	module sparc_ifu_fdp(/AUTOARG/
59	// Outputs
60	so, fdp_itlb_ctxt_bf, fdp_icd_vaddr_bf, fdp_icv_index_bf,
61	fdp_erb_pc_f, fdp_dtu_inst_s, ifu_exu_pc_d, ifu_exu_rs1_s,
62	ifu_exu_rs2_s, ifu_exu_rs3_s, ifu_tlu_pc_m, ifu_tlu_npc_m,
63	ifu_tlu_pc_oor_e, ifu_exu_pcver_e, fdp_fcl_swc_s2,
64	fdp_fcl_pc_oor_vec_f, fdp_fcl_pc_oor_e, fdp_fcl_op_s,
65	fdp_fcl_op3_s, fdp_fcl_ibit_s,
66	// Inputs
67	rclk, se, si, const_maskid, lsu_t0_pctxt_state,
68	lsu_t1_pctxt_state, lsu_t2_pctxt_state, lsu_t3_pctxt_state,
69	exu_ifu_brpc_e, tlu_ifu_trappc_w2, tlu_ifu_trapnpc_w2,
70	tlu_itlb_dmp_nctxt_g, tlu_itlb_dmp_actxt_g, tlu_itlb_tte_tag_w2,
71	dtu_fdp_thrconf_e, icd_fdp_fetdata_s1, icd_fdp_topdata_s1,
72	ifq_fdp_fill_inst, fcl_fdp_oddwin_s, fcl_fdp_pcoor_vec_f,
73	fcl_fdp_pcoor_f, fcl_fdp_mask32b_f, fcl_fdp_addr_mask_d,
74	fcl_fdp_tctxt_sel_prim, fcl_fdp_usenir_sel_nir_s1,
75	fcl_fdp_rbinst_sel_inste_s, fcl_fdp_thrtnpc_sel_tnpc_l,
76	fcl_fdp_thrtnpc_sel_npcw_l, fcl_fdp_thrtnpc_sel_pcf_l,
77	fcl_fdp_thrtnpc_sel_old_l, fcl_fdp_thr_s1_l,
78	fcl_fdp_next_thr_bf_l, fcl_fdp_next_ctxt_bf_l, fcl_fdp_thr_s2_l,
79	fcl_fdp_nirthr_s1_l, fcl_fdp_tpcbf_sel_pcp4_bf_l,
80	fcl_fdp_tpcbf_sel_brpc_bf_l, fcl_fdp_tpcbf_sel_trap_bf_l,
81	fcl_fdp_tpcbf_sel_old_bf_l, fcl_fdp_pcbf_sel_swpc_bf_l,
82	fcl_fdp_pcbf_sel_nosw_bf_l, fcl_fdp_pcbf_sel_br_bf_l,
83	fcl_fdp_trrbpc_sel_trap_bf_l, fcl_fdp_trrbpc_sel_rb_bf_l,
84	fcl_fdp_trrbpc_sel_err_bf_l, fcl_fdp_trrbpc_sel_pcs_bf_l,
85	fcl_fdp_noswpc_sel_tnpc_l_bf, fcl_fdp_noswpc_sel_old_l_bf,
86	fcl_fdp_noswpc_sel_inc_l_bf, fcl_fdp_nextpcs_sel_pce_f_l,
87	fcl_fdp_nextpcs_sel_pcd_f_l, fcl_fdp_nextpcs_sel_pcs_f_l,
88	fcl_fdp_nextpcs_sel_pcf_f_l, fcl_fdp_rdsr_sel_pc_e_l,
89	fcl_fdp_rdsr_sel_ver_e_l, fcl_fdp_rdsr_sel_thr_e_l,
90	fcl_fdp_inst_sel_curr_s_l, fcl_fdp_inst_sel_switch_s_l,
91	fcl_fdp_inst_sel_nir_s_l, fcl_fdp_inst_sel_nop_s_l,
92	fcl_fdp_tinst_sel_curr_s_l, fcl_fdp_tinst_sel_rb_s_l,
93	fcl_fdp_tinst_sel_old_s_l, fcl_fdp_tinst_sel_ifq_s_l,
94	fcl_fdp_dmpthr_l, fcl_fdp_ctxt_sel_dmp_bf_l,
95	fcl_fdp_ctxt_sel_sw_bf_l, fcl_fdp_ctxt_sel_curr_bf_l
96	);
97
98	input rclk,
99	se,
100	si;
101
102	input [7:0] const_maskid;
103
104	input [12:0] lsu_t0_pctxt_state, // primary context
105	lsu_t1_pctxt_state,
106	lsu_t2_pctxt_state,
107	lsu_t3_pctxt_state;
108
109	// input exu_ifu_va_oor_e;
110	input [47:0] exu_ifu_brpc_e; // br address for dir branch
111
112	input [48:0] tlu_ifu_trappc_w2, // trap/exception PC
113	tlu_ifu_trapnpc_w2; // next trap PC
114
115	input tlu_itlb_dmp_nctxt_g,
116	tlu_itlb_dmp_actxt_g;
117
118	input [12:0] tlu_itlb_tte_tag_w2;
119
120	// input [`IC_IDX_HI:4] ifq_fdp_icindex_bf; // index + 1 bit for 16B write
121
122	input [40:0] dtu_fdp_thrconf_e;
123
124	input [32:0] icd_fdp_fetdata_s1, // 4 inst + 4 sw bits
125	icd_fdp_topdata_s1; // next instruction
126
127	input [32:0] ifq_fdp_fill_inst; // icache miss return
128
129	input fcl_fdp_oddwin_s;
130	input [3:0] fcl_fdp_pcoor_vec_f;
131	input fcl_fdp_pcoor_f;
132	input fcl_fdp_mask32b_f;
133	input fcl_fdp_addr_mask_d;
134	input [3:0] fcl_fdp_tctxt_sel_prim;
135
136	// 2:1 mux selects
137	input fcl_fdp_usenir_sel_nir_s1; // same as usenir_d2
138	input [3:0] fcl_fdp_rbinst_sel_inste_s; // rollback 1 or 2
139
140	input [3:0] fcl_fdp_thrtnpc_sel_tnpc_l, // load npc
141	fcl_fdp_thrtnpc_sel_npcw_l,
142	fcl_fdp_thrtnpc_sel_pcf_l,
143	fcl_fdp_thrtnpc_sel_old_l;
144
145	input [3:0] fcl_fdp_thr_s1_l; // s2 thr (64*5 muxes)
146
147	// other mux selects
148	input [3:0] fcl_fdp_next_thr_bf_l; // for thrpc output mux
149	input [3:0] fcl_fdp_next_ctxt_bf_l; // for ctxt output mux
150
151	input [3:0] fcl_fdp_thr_s2_l; // s2 thr (64*5 muxes)
152	input [3:0] fcl_fdp_nirthr_s1_l; // same as thr_s1, but protected
153
154	input [3:0] fcl_fdp_tpcbf_sel_pcp4_bf_l, // selects for thread PC muxes
155	fcl_fdp_tpcbf_sel_brpc_bf_l,
156	fcl_fdp_tpcbf_sel_trap_bf_l,
157	fcl_fdp_tpcbf_sel_old_bf_l;
158
159	input fcl_fdp_pcbf_sel_swpc_bf_l,
160	fcl_fdp_pcbf_sel_nosw_bf_l,
161	fcl_fdp_pcbf_sel_br_bf_l;
162
163	input [3:0] fcl_fdp_trrbpc_sel_trap_bf_l,
164	fcl_fdp_trrbpc_sel_rb_bf_l,
165	fcl_fdp_trrbpc_sel_err_bf_l,
166	fcl_fdp_trrbpc_sel_pcs_bf_l;
167
168	input fcl_fdp_noswpc_sel_tnpc_l_bf, // next pc select from trap,
169	fcl_fdp_noswpc_sel_old_l_bf,
170	fcl_fdp_noswpc_sel_inc_l_bf;
171
172	input [3:0] fcl_fdp_nextpcs_sel_pce_f_l,
173	fcl_fdp_nextpcs_sel_pcd_f_l,
174	fcl_fdp_nextpcs_sel_pcs_f_l,
175	fcl_fdp_nextpcs_sel_pcf_f_l;
176
177	input fcl_fdp_rdsr_sel_pc_e_l,
178	fcl_fdp_rdsr_sel_ver_e_l,
179	fcl_fdp_rdsr_sel_thr_e_l;
180
181	input fcl_fdp_inst_sel_curr_s_l, // selects for inst_s2
182	fcl_fdp_inst_sel_switch_s_l,
183	fcl_fdp_inst_sel_nir_s_l,
184	fcl_fdp_inst_sel_nop_s_l;
185
186	input [3:0] fcl_fdp_tinst_sel_curr_s_l, // selects for tinst regs
187	fcl_fdp_tinst_sel_rb_s_l,
188	fcl_fdp_tinst_sel_old_s_l,
189	fcl_fdp_tinst_sel_ifq_s_l;
190
191	input [3:0] fcl_fdp_dmpthr_l;
192
193	input fcl_fdp_ctxt_sel_dmp_bf_l,
194	fcl_fdp_ctxt_sel_sw_bf_l,
195	fcl_fdp_ctxt_sel_curr_bf_l;
196
197
198	output so;
199	output [12:0] fdp_itlb_ctxt_bf;
200	output [47:2] fdp_icd_vaddr_bf; // 11:2 is index to ic
201	output [11:5] fdp_icv_index_bf;
202	output [47:0] fdp_erb_pc_f;
203	output [31:0] fdp_dtu_inst_s; // 32b inst + switch bit
204
205	output [47:0] ifu_exu_pc_d; // PC for rel branch
206	output [4:0] ifu_exu_rs1_s, // reg file read address
207	ifu_exu_rs2_s,
208	ifu_exu_rs3_s;
209
210	output [48:0] ifu_tlu_pc_m,
211	ifu_tlu_npc_m;
212
213	output ifu_tlu_pc_oor_e;
214
215	output [63:0] ifu_exu_pcver_e; // PCs to different dests.
216
217	output fdp_fcl_swc_s2; // tells whether to switch or not
218	output [3:0] fdp_fcl_pc_oor_vec_f; // PC va hole check
219	output fdp_fcl_pc_oor_e;
220
221	output [1:0] fdp_fcl_op_s;
222	output [5:2] fdp_fcl_op3_s;
223	output fdp_fcl_ibit_s;
224
225
226
227
228	//----------------------------------------------------------------------
229	// Declarations
230	//----------------------------------------------------------------------
231
232	// local signals
233
234	// Contexts
235	wire [12:0] curr_ctxt,
236	sw_ctxt,
237	dmp_ctxt,
238	dmp_ctxt_unq,
239	dmp_ctxt1,
240	dmp_ctxt2,
241	t0_ctxt_bf,
242	t1_ctxt_bf,
243	t2_ctxt_bf,
244	t3_ctxt_bf;
245
246	// PCs
247	wire [48:0] t0pc_f, t1pc_f, t2pc_f, t3pc_f, // F stage thread PC
248	t0pc_s, t1pc_s, t2pc_s, t3pc_s, // S stage thr pc
249	t0_next_pcs_f, t1_next_pcs_f, t2_next_pcs_f, t3_next_pcs_f,
250	t0npc_bf, t1npc_bf, t2npc_bf, t3npc_bf, // Next PC in
251	// BF stage
252	pc_s, pc_d, pc_e, pc_m, pc_w,
253	npc_s, npc_d, npc_e, npc_m, npc_w,
254	pc_d_adj, npc_d_adj;
255
256	wire [47:0] pc_bf,
257	swpc_bf, // PC of next thread if not branch
258	pc_f;
259
260	wire [48:0] nextpc_nosw_bf, // next pc if no switch
261	am_mask;
262
263	// trap PCs and rollback PCs
264	wire [48:0] t0_trap_rb_pc_bf,
265	t1_trap_rb_pc_bf,
266	t2_trap_rb_pc_bf,
267	t3_trap_rb_pc_bf;
268
269	wire [48:0] thr_trappc_bf,
270	t0_trapnpc_f,
271	t1_trapnpc_f,
272	t2_trapnpc_f,
273	t3_trapnpc_f,
274	trapnpc0_bf,
275	trapnpc1_bf,
276	trapnpc2_bf,
277	trapnpc3_bf;
278
279	// Branch PCs
280	wire [48:0] pcinc_f; // incr output
281
282	// Instruction Words
283	wire [32:0] inst_s2, // instruction to switch to in S
284	fdp_inst_s, // instruction to be sent to D
285	t0inst_s1, // input to thr inst reg in S
286	t1inst_s1,
287	t2inst_s1,
288	t3inst_s1,
289	t0inst_s2, // thr inst reg output
290	t1inst_s2,
291	t2inst_s2,
292	t3inst_s2;
293
294	wire [32:0] inst_s1; // fetched instruction in S
295	wire [32:0] inst_s1_bf1; // buf version of inst_s1
296
297	wire [32:0] rb_inst0_s, // instruction to rollback to
298	rb_inst1_s, // instruction to rollback to
299	rb_inst2_s, // instruction to rollback to
300	rb_inst3_s, // instruction to rollback to
301	inst_d, // rollback 1
302	inst_e; // rollback 2
303
304	// Next instruction word
305	wire [32:0] nirdata_s1, // next inst reg contents
306	t0nir, // thread NIR reg output
307	t1nir,
308	t2nir,
309	t3nir;
310
311	wire clk;
312
313
314	//
315	// Code start here
316	//
317	assign clk = rclk;
318
319	//----------------------------------------------------------------------
320	// Context Reg
321	//----------------------------------------------------------------------
322	assign t0_ctxt_bf = lsu_t0_pctxt_state & {13{fcl_fdp_tctxt_sel_prim[0]}};
323
324	`ifdef FPGA_SYN_1THREAD
325
326	assign sw_ctxt = t0_ctxt_bf;
327	assign curr_ctxt = t0_ctxt_bf;
328	assign dmp_ctxt_unq = lsu_t0_pctxt_state;
329
330	`else
331
332	assign t1_ctxt_bf = lsu_t1_pctxt_state & {13{fcl_fdp_tctxt_sel_prim[1]}};
333	assign t2_ctxt_bf = lsu_t2_pctxt_state & {13{fcl_fdp_tctxt_sel_prim[2]}};
334	assign t3_ctxt_bf = lsu_t3_pctxt_state & {13{fcl_fdp_tctxt_sel_prim[3]}};
335
336	dp_mux4ds #(13) sw_ctxt_mux(.dout (sw_ctxt),
337	.in0 (t0_ctxt_bf),
338	.in1 (t1_ctxt_bf),
339	.in2 (t2_ctxt_bf),
340	.in3 (t3_ctxt_bf),
341	.sel0_l (fcl_fdp_next_ctxt_bf_l[0]),
342	.sel1_l (fcl_fdp_next_ctxt_bf_l[1]),
343	.sel2_l (fcl_fdp_next_ctxt_bf_l[2]),
344	.sel3_l (fcl_fdp_next_ctxt_bf_l[3]));
345
346	dp_mux4ds #(13) curr_ctxt_mux(.dout (curr_ctxt),
347	.in0 (t0_ctxt_bf),
348	.in1 (t1_ctxt_bf),
349	.in2 (t2_ctxt_bf),
350	.in3 (t3_ctxt_bf),
351	.sel0_l (fcl_fdp_thr_s2_l[0]),
352	.sel1_l (fcl_fdp_thr_s2_l[1]),
353	.sel2_l (fcl_fdp_thr_s2_l[2]),
354	.sel3_l (fcl_fdp_thr_s2_l[3]));
355
356	dp_mux4ds #(13) dmp_ctxt_mux(.dout (dmp_ctxt_unq),
357	.in0 (lsu_t0_pctxt_state),
358	.in1 (lsu_t1_pctxt_state),
359	.in2 (lsu_t2_pctxt_state),
360	.in3 (lsu_t3_pctxt_state),
361	.sel0_l (fcl_fdp_dmpthr_l[0]),
362	.sel1_l (fcl_fdp_dmpthr_l[1]),
363	.sel2_l (fcl_fdp_dmpthr_l[2]),
364	.sel3_l (fcl_fdp_dmpthr_l[3]));
365	`endif // !`ifdef FPGA_SYN_1THREAD
366
367	assign dmp_ctxt1 = dmp_ctxt_unq & {13{~(tlu_itlb_dmp_nctxt_g \|
368	tlu_itlb_dmp_actxt_g)}};
369	//`ifdef SPARC_HPV_EN
370	assign dmp_ctxt2 = {tlu_itlb_tte_tag_w2[12:7],tlu_itlb_tte_tag_w2[6:0]} &
371	{13{tlu_itlb_dmp_actxt_g}};
372	//`else
373	// assign dmp_ctxt2 = {tlu_itlb_tte_tag_w2[13:8],tlu_itlb_tte_tag_w2[6:0]} &
374	// {13{tlu_itlb_dmp_actxt_g}};
375	//`endif
376
377	assign dmp_ctxt = dmp_ctxt1 \| dmp_ctxt2;
378
379	dp_mux3ds #(13) ctxt_mux (.dout (fdp_itlb_ctxt_bf),
380	.in0 (curr_ctxt),
381	.in1 (sw_ctxt),
382	.in2 (dmp_ctxt),
383	.sel0_l (fcl_fdp_ctxt_sel_curr_bf_l),
384	.sel1_l (fcl_fdp_ctxt_sel_sw_bf_l),
385	.sel2_l (fcl_fdp_ctxt_sel_dmp_bf_l));
386
387
388	// ----------------------------------------------------------------------
389	// PC datapath
390	// ----------------------------------------------------------------------
391
392	// pc/thr to exu for rdsr instruction
393	// this is the only 64 bit cell in the IFU
394	dp_mux3ds #(64) ver_mux(.dout (ifu_exu_pcver_e[63:0]),
395	.in0 ({{16{pc_e[47]}}, pc_e[47:0]}),
396	.in1 ({`VER_MANUF,
397	`VER_IMPL,
398	const_maskid[7:0],
399	`VER_MAXGL,
400	`VER_MAXTL,
401	`VER_MAXWIN}),
402	.in2 ({12'b0,
403	dtu_fdp_thrconf_e[40:29],
404	4'b0,
405	dtu_fdp_thrconf_e[28:9],
406	2'b0,
407	dtu_fdp_thrconf_e[8:3],
408	5'b0,
409	dtu_fdp_thrconf_e[2:0]}),
410	.sel0_l (fcl_fdp_rdsr_sel_pc_e_l),
411	.sel1_l (fcl_fdp_rdsr_sel_ver_e_l),
412	.sel2_l (fcl_fdp_rdsr_sel_thr_e_l));
413
414	// Select the next thread pc (for F stage)
415	dp_mux4ds #(49) t0_pcbf_mux(.dout (t0npc_bf),
416	.in0 ({fcl_fdp_pcoor_vec_f[0], t0pc_f[47:0]}),
417	.in1 (nextpc_nosw_bf),
418	.in2 (t0_trap_rb_pc_bf),
419	.in3 ({1'b0, exu_ifu_brpc_e}),
420	.sel0_l (fcl_fdp_tpcbf_sel_old_bf_l[0]),
421	.sel1_l (fcl_fdp_tpcbf_sel_pcp4_bf_l[0]),
422	.sel2_l (fcl_fdp_tpcbf_sel_trap_bf_l[0]),
423	.sel3_l (fcl_fdp_tpcbf_sel_brpc_bf_l[0]));
424
425	`ifdef FPGA_SYN_1THREAD
426	`else
427	dp_mux4ds #(49) t1_pcbf_mux(.dout (t1npc_bf),
428	.in0 ({fcl_fdp_pcoor_vec_f[1], t1pc_f[47:0]}),
429	.in1 (nextpc_nosw_bf),
430	.in2 (t1_trap_rb_pc_bf),
431	.in3 ({1'b0, exu_ifu_brpc_e}),
432	.sel0_l (fcl_fdp_tpcbf_sel_old_bf_l[1]),
433	.sel1_l (fcl_fdp_tpcbf_sel_pcp4_bf_l[1]),
434	.sel2_l (fcl_fdp_tpcbf_sel_trap_bf_l[1]),
435	.sel3_l (fcl_fdp_tpcbf_sel_brpc_bf_l[1]));
436
437	dp_mux4ds #(49) t2_pcbf_mux(.dout (t2npc_bf),
438	.in0 ({fcl_fdp_pcoor_vec_f[2], t2pc_f[47:0]}),
439	.in1 (nextpc_nosw_bf),
440	.in2 (t2_trap_rb_pc_bf),
441	.in3 ({1'b0, exu_ifu_brpc_e}),
442	.sel0_l (fcl_fdp_tpcbf_sel_old_bf_l[2]),
443	.sel1_l (fcl_fdp_tpcbf_sel_pcp4_bf_l[2]),
444	.sel2_l (fcl_fdp_tpcbf_sel_trap_bf_l[2]),
445	.sel3_l (fcl_fdp_tpcbf_sel_brpc_bf_l[2]));
446
447	dp_mux4ds #(49) t3_pcbf_mux(.dout (t3npc_bf),
448	.in0 ({fcl_fdp_pcoor_vec_f[3], t3pc_f[47:0]}),
449	.in1 (nextpc_nosw_bf),
450	.in2 (t3_trap_rb_pc_bf),
451	.in3 ({1'b0, exu_ifu_brpc_e}),
452	.sel0_l (fcl_fdp_tpcbf_sel_old_bf_l[3]),
453	.sel1_l (fcl_fdp_tpcbf_sel_pcp4_bf_l[3]),
454	.sel2_l (fcl_fdp_tpcbf_sel_trap_bf_l[3]),
455	.sel3_l (fcl_fdp_tpcbf_sel_brpc_bf_l[3]));
456	`endif
457
458	// F stage thread PC regs; use low power thr flop
459	dff_s #(49) t0_pcf_reg(.din (t0npc_bf),
460	.clk (clk),
461	.q (t0pc_f),
462	.se (se), .si(), .so());
463	`ifdef FPGA_SYN_1THREAD
464	assign fdp_fcl_pc_oor_vec_f = {3'b0, t0pc_f[48]};
465	assign swpc_bf = t0pc_f[47:0];
466	`else
467	dff_s #(49) t1_pcf_reg(.din (t1npc_bf),
468	.clk (clk),
469	.q (t1pc_f),
470	.se (se), .si(), .so());
471	dff_s #(49) t2_pcf_reg(.din (t2npc_bf),
472	.clk (clk),
473	.q (t2pc_f),
474	.se (se), .si(), .so());
475	dff_s #(49) t3_pcf_reg(.din (t3npc_bf),
476	.clk (clk),
477	.q (t3pc_f),
478	.se (se), .si(), .so());
479
480	assign fdp_fcl_pc_oor_vec_f = {t3pc_f[48], t2pc_f[48],
481	t1pc_f[48], t0pc_f[48]};
482
483
484	// select the pc to be used on a switch -- need to protect
485	dp_mux4ds #(48) swpc_mux(.dout (swpc_bf),
486	.in0 (t0pc_f[47:0]),
487	.in1 (t1pc_f[47:0]),
488	.in2 (t2pc_f[47:0]),
489	.in3 (t3pc_f[47:0]),
490	.sel0_l (fcl_fdp_next_thr_bf_l[0]),
491	.sel1_l (fcl_fdp_next_thr_bf_l[1]),
492	.sel2_l (fcl_fdp_next_thr_bf_l[2]),
493	.sel3_l (fcl_fdp_next_thr_bf_l[3]));
494	`endif
495
496	// choose between I$ write address and read address
497	// need mux only for lower 11 bits (2+3 + ICINDEX_SIZE)
498	// dp_mux2es #(48) ifqfdp_mux(.dout (icaddr_nosw_bf[47:0]),
499	// .in0 (nextpc_nosw_bf[47:0]),
500	// .in1 ({{37{1'b0}}, ifq_fdp_icindex_bf, 4'b0}),
501	// .sel (fcl_fdp_ifqfdp_sel_ifq_bf)); // 1=ifq
502
503	// implements switch and branch
504	// can we cut this down to 11 bits? No! tlb needs all 48
505
506	// dp_mux4ds #(48) nxt_icaddr_mux(.dout (icaddr_bf),
507	// .in0 (swpc_bf[47:0]),
508	// .in1 (nextpc_nosw_bf[47:0]),
509	// .in2 ({8'b0, {`IC_TAG_SZ{1'b0}},
510	// ifq_fdp_icindex_bf, 4'b0}),
511	// .in3 (exu_ifu_brpc_e[47:0]),
512	// .sel0_l (fcl_fdp_icaddr_sel_swpc_bf_l),
513	// .sel1_l (fcl_fdp_icaddr_sel_curr_bf_l),
514	// .sel2_l (fcl_fdp_icaddr_sel_ifq_bf_l),
515	// .sel3_l (fcl_fdp_icaddr_sel_br_bf_l));
516
517	// assign fdp_icd_vaddr_bf = icaddr_bf[47:0];
518	// this goes to the itlb, icd and ict on top of fdp
519	// this is !!very critical!!
520	assign fdp_icd_vaddr_bf = pc_bf[47:2];
521
522	// create separate output for the icv to the left
523	assign fdp_icv_index_bf = pc_bf[11:5];
524
525	// Place this mux as close to the top (itlb) as possible
526	dp_mux3ds #(48) pcbf_mux(.dout (pc_bf[47:0]),
527	.in0 (swpc_bf[47:0]),
528	.in1 (nextpc_nosw_bf[47:0]),
529	.in2 (exu_ifu_brpc_e[47:0]),
530	.sel0_l (fcl_fdp_pcbf_sel_swpc_bf_l),
531	.sel1_l (fcl_fdp_pcbf_sel_nosw_bf_l),
532	.sel2_l (fcl_fdp_pcbf_sel_br_bf_l));
533
534	dff_s #(48) pcf_reg(.din (pc_bf),
535	.clk (clk),
536	.q (pc_f),
537	.se (se), .si(), .so());
538
539	assign fdp_erb_pc_f = pc_f[47:0];
540
541	// trappc mux (choose trap pc vs rollback/uTrap pc)
542	dp_mux4ds #(49) trap_pc0_mux(.dout (t0_trap_rb_pc_bf),
543	.in0 (tlu_ifu_trappc_w2),
544	.in1 (pc_d_adj),
545	.in2 (t0pc_s),
546	.in3 (pc_w),
547	.sel0_l (fcl_fdp_trrbpc_sel_trap_bf_l[0]),
548	.sel1_l (fcl_fdp_trrbpc_sel_rb_bf_l[0]),
549	.sel2_l (fcl_fdp_trrbpc_sel_pcs_bf_l[0]),
550	.sel3_l (fcl_fdp_trrbpc_sel_err_bf_l[0]));
551
552	`ifdef FPGA_SYN_1THREAD
553	`else
554	dp_mux4ds #(49) trap_pc1_mux(.dout (t1_trap_rb_pc_bf),
555	.in0 (tlu_ifu_trappc_w2),
556	.in1 (pc_d_adj),
557	.in2 (t1pc_s),
558	.in3 (pc_w),
559	.sel0_l (fcl_fdp_trrbpc_sel_trap_bf_l[1]),
560	.sel1_l (fcl_fdp_trrbpc_sel_rb_bf_l[1]),
561	.sel2_l (fcl_fdp_trrbpc_sel_pcs_bf_l[1]),
562	.sel3_l (fcl_fdp_trrbpc_sel_err_bf_l[1]));
563
564	dp_mux4ds #(49) trap_pc2_mux(.dout (t2_trap_rb_pc_bf),
565	.in0 (tlu_ifu_trappc_w2),
566	.in1 (pc_d_adj),
567	.in2 (t2pc_s),
568	.in3 (pc_w),
569	.sel0_l (fcl_fdp_trrbpc_sel_trap_bf_l[2]),
570	.sel1_l (fcl_fdp_trrbpc_sel_rb_bf_l[2]),
571	.sel2_l (fcl_fdp_trrbpc_sel_pcs_bf_l[2]),
572	.sel3_l (fcl_fdp_trrbpc_sel_err_bf_l[2]));
573
574	dp_mux4ds #(49) trap_pc3_mux(.dout (t3_trap_rb_pc_bf),
575	.in0 (tlu_ifu_trappc_w2),
576	.in1 (pc_d_adj),
577	.in2 (t3pc_s),
578	.in3 (pc_w),
579	.sel0_l (fcl_fdp_trrbpc_sel_trap_bf_l[3]),
580	.sel1_l (fcl_fdp_trrbpc_sel_rb_bf_l[3]),
581	.sel2_l (fcl_fdp_trrbpc_sel_pcs_bf_l[3]),
582	.sel3_l (fcl_fdp_trrbpc_sel_err_bf_l[3]));
583	`endif
584
585
586	// can reduce this to a 2:1 mux since reset pc is not used any more and
587	// pc_f is not needed.
588	dp_mux3ds #(49) pcp4_mux(.dout (nextpc_nosw_bf),
589	.in0 (pcinc_f),
590	.in1 (thr_trappc_bf),
591	.in2 ({fcl_fdp_pcoor_f, pc_f[47:0]}),
592	.sel0_l (fcl_fdp_noswpc_sel_inc_l_bf),
593	.sel1_l (fcl_fdp_noswpc_sel_tnpc_l_bf),
594	.sel2_l (fcl_fdp_noswpc_sel_old_l_bf));
595
596
597	// next S stage thread pc mux per thread
598	// Use advtpcs signal which works for stall (Aug '01)
599	// Merged pc_e/pc_d into the eqn to allow for rollback
600	dp_mux4ds #(49) t0pcf_mux(.dout (t0_next_pcs_f),
601	.in0 (t0pc_s),
602	.in1 ({fcl_fdp_pcoor_vec_f[0], t0pc_f[47:0]}),
603	.in2 (pc_d_adj),
604	.in3 (pc_e),
605	.sel0_l (fcl_fdp_nextpcs_sel_pcs_f_l[0]),
606	.sel1_l (fcl_fdp_nextpcs_sel_pcf_f_l[0]),
607	.sel2_l (fcl_fdp_nextpcs_sel_pcd_f_l[0]),
608	.sel3_l (fcl_fdp_nextpcs_sel_pce_f_l[0]));
609
610	`ifdef FPGA_SYN_1THREAD
611	`else
612	dp_mux4ds #(49) t1pcf_mux(.dout (t1_next_pcs_f),
613	.in0 (t1pc_s),
614	.in1 ({fcl_fdp_pcoor_vec_f[1], t1pc_f[47:0]}),
615	.in2 (pc_d_adj),
616	.in3 (pc_e),
617	.sel0_l (fcl_fdp_nextpcs_sel_pcs_f_l[1]),
618	.sel1_l (fcl_fdp_nextpcs_sel_pcf_f_l[1]),
619	.sel2_l (fcl_fdp_nextpcs_sel_pcd_f_l[1]),
620	.sel3_l (fcl_fdp_nextpcs_sel_pce_f_l[1]));
621
622	dp_mux4ds #(49) t2pcf_mux(.dout (t2_next_pcs_f),
623	.in0 (t2pc_s),
624	.in1 ({fcl_fdp_pcoor_vec_f[2], t2pc_f[47:0]}),
625	// .in1 ({fcl_fdp_pcoor_f, pc_f[47:0]}),
626	.in2 (pc_d_adj),
627	.in3 (pc_e),
628	.sel0_l (fcl_fdp_nextpcs_sel_pcs_f_l[2]),
629	.sel1_l (fcl_fdp_nextpcs_sel_pcf_f_l[2]),
630	.sel2_l (fcl_fdp_nextpcs_sel_pcd_f_l[2]),
631	.sel3_l (fcl_fdp_nextpcs_sel_pce_f_l[2]));
632
633	dp_mux4ds #(49) t3pcf_mux(.dout (t3_next_pcs_f),
634	.in0 (t3pc_s),
635	.in1 ({fcl_fdp_pcoor_vec_f[3], t3pc_f[47:0]}),
636	// .in1 ({fcl_fdp_pcoor_f, pc_f[47:0]}),
637	.in2 (pc_d_adj),
638	.in3 (pc_e),
639	.sel0_l (fcl_fdp_nextpcs_sel_pcs_f_l[3]),
640	.sel1_l (fcl_fdp_nextpcs_sel_pcf_f_l[3]),
641	.sel2_l (fcl_fdp_nextpcs_sel_pcd_f_l[3]),
642	.sel3_l (fcl_fdp_nextpcs_sel_pce_f_l[3]));
643	`endif
644
645
646	// S stage thread PC regs; use low power thr flop
647	dff_s #(49) t0pcs_reg(.din (t0_next_pcs_f),
648	.q (t0pc_s),
649	.clk (clk), .se(se), .si(), .so());
650	`ifdef FPGA_SYN_1THREAD
651	assign pc_s = t0pc_s;
652	assign npc_s = t0_next_pcs_f;
653	`else
654	dff_s #(49) t1pcs_reg(.din (t1_next_pcs_f),
655	.q (t1pc_s),
656	.clk (clk), .se(se), .si(), .so());
657	dff_s #(49) t2pcs_reg(.din (t2_next_pcs_f),
658	.q (t2pc_s),
659	.clk (clk), .se(se), .si(), .so());
660	dff_s #(49) t3pcs_reg(.din (t3_next_pcs_f),
661	.q (t3pc_s),
662	.clk (clk), .se(se), .si(), .so());
663
664	// S stage PC mux -- need to protect
665	dp_mux4ds #(49) pcs_mux(.dout (pc_s),
666	.in0 (t0pc_s),
667	.in1 (t1pc_s),
668	.in2 (t2pc_s),
669	.in3 (t3pc_s),
670	.sel0_l (fcl_fdp_thr_s2_l[0]),
671	.sel1_l (fcl_fdp_thr_s2_l[1]),
672	.sel2_l (fcl_fdp_thr_s2_l[2]),
673	.sel3_l (fcl_fdp_thr_s2_l[3]));
674
675	// S stage next PC mux -- need to protect
676	dp_mux4ds #(49) npcs_mux(.dout (npc_s),
677	.in0 (t0_next_pcs_f),
678	.in1 (t1_next_pcs_f),
679	.in2 (t2_next_pcs_f),
680	.in3 (t3_next_pcs_f),
681	.sel0_l (fcl_fdp_thr_s2_l[0]),
682	.sel1_l (fcl_fdp_thr_s2_l[1]),
683	.sel2_l (fcl_fdp_thr_s2_l[2]),
684	.sel3_l (fcl_fdp_thr_s2_l[3]));
685	`endif
686
687	// D stage PC and nPC
688	dff_s #(49) pcd_reg(.din (pc_s),
689	.q (pc_d),
690	.clk (clk), .se(se), .si(), .so());
691	dff_s #(49) npcd_reg(.din (npc_s),
692	.q (npc_d),
693	.clk (clk), .se(se), .si(), .so());
694
695	assign am_mask = {{17{~fcl_fdp_addr_mask_d}}, 32'hffffffff};
696
697	// nand2
698	assign pc_d_adj = pc_d & am_mask;
699	assign npc_d_adj = npc_d & am_mask;
700
701	assign ifu_exu_pc_d = pc_d_adj[47:0];
702
703	// E stage PC and nPC
704	dff_s #(49) pce_reg(.din (pc_d_adj),
705	.q (pc_e),
706	.clk (clk), .se(se), .si(), .so());
707	dff_s #(49) npce_reg(.din (npc_d_adj),
708	.q (npc_e),
709	.clk (clk), .se(se), .si(), .so());
710
711	assign fdp_fcl_pc_oor_e = pc_e[48];
712	assign ifu_tlu_pc_oor_e = pc_e[48];
713
714	// M stage PC and nPC
715	dff_s #(49) pcm_reg(.din (pc_e),
716	.q (pc_m),
717	.clk (clk), .se(se), .si(), .so());
718	dff_s #(49) npcm_reg(.din (npc_e),
719	.q (npc_m),
720	.clk (clk), .se(se), .si(), .so());
721	assign ifu_tlu_pc_m = pc_m[48:0];
722	assign ifu_tlu_npc_m = npc_m[48:0];
723
724	// W stage PC and nPC
725	dff_s #(49) pcw_reg(.din (pc_m),
726	.q (pc_w),
727	.clk (clk), .se(se), .si(), .so());
728	dff_s #(49) npcw_reg(.din (npc_m),
729	.q (npc_w),
730	.clk (clk), .se(se), .si(), .so());
731
732	// assign ifu_tlu_pc_w = pc_w;
733	// assign ifu_tlu_npc_w = npc_w;
734
735	// PC incrementer
736	// can we fit the ofl logic on the side of the incrementer?
737	assign pcinc_f[1:0] = pc_f[1:0];
738	sparc_ifu_incr46 pc_inc(.a (pc_f[47:2]),
739	.a_inc (pcinc_f[47:2]),
740	.ofl ()); // ofl output not needed
741
742	// assign pcinc_f[48] = inc_ofl & ~fcl_fdp_mask32b_f \| fcl_fdp_pcoor_f;
743	assign pcinc_f[48] = ~pc_f[47] & pcinc_f[47] & ~fcl_fdp_mask32b_f \|
744	fcl_fdp_pcoor_f;
745
746	// Enable for thr trapnpc reg
747	dp_mux4ds #(49) t0tnpc_mux(.dout (trapnpc0_bf),
748	.in0 (tlu_ifu_trapnpc_w2),
749	.in1 (npc_w),
750	.in2 (t0pc_f),
751	.in3 (t0_trapnpc_f),
752	.sel0_l (fcl_fdp_thrtnpc_sel_tnpc_l[0]),
753	.sel1_l (fcl_fdp_thrtnpc_sel_npcw_l[0]),
754	.sel2_l (fcl_fdp_thrtnpc_sel_pcf_l[0]),
755	.sel3_l (fcl_fdp_thrtnpc_sel_old_l[0]));
756
757	`ifdef FPGA_SYN_1THREAD
758	`else
759	dp_mux4ds #(49) t1tnpc_mux(.dout (trapnpc1_bf),
760	.in0 (tlu_ifu_trapnpc_w2),
761	.in1 (npc_w),
762	.in2 (t1pc_f),
763	.in3 (t1_trapnpc_f),
764	.sel0_l (fcl_fdp_thrtnpc_sel_tnpc_l[1]),
765	.sel1_l (fcl_fdp_thrtnpc_sel_npcw_l[1]),
766	.sel2_l (fcl_fdp_thrtnpc_sel_pcf_l[1]),
767	.sel3_l (fcl_fdp_thrtnpc_sel_old_l[1]));
768
769	dp_mux4ds #(49) t2tnpc_mux(.dout (trapnpc2_bf),
770	.in0 (tlu_ifu_trapnpc_w2),
771	.in1 (npc_w),
772	.in2 (t2pc_f),
773	.in3 (t2_trapnpc_f),
774	.sel0_l (fcl_fdp_thrtnpc_sel_tnpc_l[2]),
775	.sel1_l (fcl_fdp_thrtnpc_sel_npcw_l[2]),
776	.sel2_l (fcl_fdp_thrtnpc_sel_pcf_l[2]),
777	.sel3_l (fcl_fdp_thrtnpc_sel_old_l[2]));
778
779	dp_mux4ds #(49) t3tnpc_mux(.dout (trapnpc3_bf),
780	.in0 (tlu_ifu_trapnpc_w2),
781	.in1 (npc_w),
782	.in2 (t3pc_f),
783	.in3 (t3_trapnpc_f),
784	.sel0_l (fcl_fdp_thrtnpc_sel_tnpc_l[3]),
785	.sel1_l (fcl_fdp_thrtnpc_sel_npcw_l[3]),
786	.sel2_l (fcl_fdp_thrtnpc_sel_pcf_l[3]),
787	.sel3_l (fcl_fdp_thrtnpc_sel_old_l[3]));
788	`endif
789
790	// thread next trap pc reg
791	dff_s #(49) t0tnpcf_reg(.din (trapnpc0_bf),
792	.q (t0_trapnpc_f),
793	.clk (clk), .se(se), .si(), .so());
794	`ifdef FPGA_SYN_1THREAD
795	assign thr_trappc_bf = t0_trapnpc_f;
796	`else
797	dff_s #(49) t1tnpcf_reg(.din (trapnpc1_bf),
798	.q (t1_trapnpc_f),
799	.clk (clk), .se(se), .si(), .so());
800	dff_s #(49) t2tnpcf_reg(.din (trapnpc2_bf),
801	.q (t2_trapnpc_f),
802	.clk (clk), .se(se), .si(), .so());
803	dff_s #(49) t3tnpcf_reg(.din (trapnpc3_bf),
804	.q (t3_trapnpc_f),
805	.clk (clk), .se(se), .si(), .so());
806
807	dp_mux4ds #(49) nxttpc_mux(.dout (thr_trappc_bf),
808	.in0 (t0_trapnpc_f),
809	.in1 (t1_trapnpc_f),
810	.in2 (t2_trapnpc_f),
811	.in3 (t3_trapnpc_f),
812	.sel0_l (fcl_fdp_thr_s2_l[0]), // thr_s2 = thr_f
813	.sel1_l (fcl_fdp_thr_s2_l[1]),
814	.sel2_l (fcl_fdp_thr_s2_l[2]),
815	.sel3_l (fcl_fdp_thr_s2_l[3]));
816	`endif
817
818	// During rst nextpc_nosw_bf = PO_RESET_PC. All thread PC_f registers,
819	// the icaddr_f register and the nextpc register should be loaded
820	// with nextpc_nosw_bf during reset.
821	// Eventually, we will load the reset_pc from the trap logic unit,
822	// which will arrive on the trap_pc bus.
823
824
825	// TBD in PC datapath:
826	// 1. Add useNIR bit to PCs -- DONE
827	// 2. Add support for ifq request grant -- DONE
828	// 3. Generate icache read signal (from fcl?) -- DONE
829	// 4. Rollback functionality -- DONE
830	// 5. PC range checks -- DONE
831	// 6. Change PC to 48 bit value -- DONE
832
833
834	//----------------------------------------------------------------------
835	// Fetched Instruction Datapath
836	//----------------------------------------------------------------------
837
838	// This is logically 33 bits wide. The NIR and IR datapaths are laid
839	// side by side, making this a 66bit datapath. The NIR path is
840	// potentially a little longer.
841
842	// choose between NIR data and fetched data
843	dp_mux2es #(33) usenir_mux(.dout (inst_s1),
844	.in0 (icd_fdp_fetdata_s1[32:0]),
845	.in1 (nirdata_s1),
846	.sel (fcl_fdp_usenir_sel_nir_s1)); // 1=nir
847
848	// Instruction Output Mux
849	// CHANGE: now 4:1
850	dp_mux4ds #(33) instout_mux(.dout (fdp_inst_s),
851	.in0 (icd_fdp_fetdata_s1[32:0]),
852	.in1 (inst_s2),
853	.in2 ({`NOP, 1'b0}),
854	.in3 (nirdata_s1[32:0]),
855	.sel0_l (fcl_fdp_inst_sel_curr_s_l),
856	.sel1_l (fcl_fdp_inst_sel_switch_s_l),
857	.sel2_l (fcl_fdp_inst_sel_nop_s_l),
858	.sel3_l (fcl_fdp_inst_sel_nir_s_l));
859
860	assign fdp_fcl_swc_s2 = fdp_inst_s[0];
861
862	assign fdp_fcl_op_s = fdp_inst_s[32:31];
863	assign fdp_fcl_op3_s = fdp_inst_s[25:22];
864	assign fdp_fcl_ibit_s = fdp_inst_s[14];
865
866	assign fdp_dtu_inst_s = fdp_inst_s[32:1];
867
868	// CHANGE: Random logic to fix timing paths
869	// output pin on RHS, as close to IRF as possible
870	// 16x drivers
871	// nand2-xor-invert
872	assign ifu_exu_rs1_s[4] = fdp_inst_s[19] ^
873	(fdp_inst_s[18] & fcl_fdp_oddwin_s);
874	assign ifu_exu_rs1_s[3:0] = fdp_inst_s[18:15];
875
876	assign ifu_exu_rs2_s[4] = (fdp_inst_s[5] ^
877	(fdp_inst_s[4] & fcl_fdp_oddwin_s));
878	assign ifu_exu_rs2_s[3:0] = fdp_inst_s[4:1];
879
880	assign ifu_exu_rs3_s[4] = (fdp_inst_s[30] ^
881	(fdp_inst_s[29] & fcl_fdp_oddwin_s));
882	assign ifu_exu_rs3_s[3:0] = fdp_inst_s[29:26];
883
884
885	dp_buffer #(33) insts1_buf(inst_s1_bf1, inst_s1[32:0]);
886
887	// Thread instruction muxes
888	dp_mux4ds #(33) t0inst_mux(.dout (t0inst_s1),
889	.in0 (ifq_fdp_fill_inst),
890	.in1 (inst_s1_bf1),
891	.in2 (t0inst_s2),
892	.in3 (rb_inst0_s),
893	.sel0_l (fcl_fdp_tinst_sel_ifq_s_l[0]),
894	.sel1_l (fcl_fdp_tinst_sel_curr_s_l[0]),
895	.sel2_l (fcl_fdp_tinst_sel_old_s_l[0]),
896	.sel3_l (fcl_fdp_tinst_sel_rb_s_l[0]));
897
898	`ifdef FPGA_SYN_1THREAD
899	`else
900	dp_mux4ds #(33) t1inst_mux(.dout (t1inst_s1),
901	.in0 (ifq_fdp_fill_inst),
902	.in1 (inst_s1_bf1),
903	.in2 (t1inst_s2),
904	.in3 (rb_inst1_s),
905	.sel0_l (fcl_fdp_tinst_sel_ifq_s_l[1]),
906	.sel1_l (fcl_fdp_tinst_sel_curr_s_l[1]),
907	.sel2_l (fcl_fdp_tinst_sel_old_s_l[1]),
908	.sel3_l (fcl_fdp_tinst_sel_rb_s_l[1]));
909
910	dp_mux4ds #(33) t2inst_mux(.dout (t2inst_s1),
911	.in0 (ifq_fdp_fill_inst),
912	.in1 (inst_s1_bf1),
913	.in2 (t2inst_s2),
914	.in3 (rb_inst2_s),
915	.sel0_l (fcl_fdp_tinst_sel_ifq_s_l[2]),
916	.sel1_l (fcl_fdp_tinst_sel_curr_s_l[2]),
917	.sel2_l (fcl_fdp_tinst_sel_old_s_l[2]),
918	.sel3_l (fcl_fdp_tinst_sel_rb_s_l[2]));
919
920	dp_mux4ds #(33) t3inst_mux(.dout (t3inst_s1),
921	.in0 (ifq_fdp_fill_inst),
922	.in1 (inst_s1_bf1),
923	.in2 (t3inst_s2),
924	.in3 (rb_inst3_s),
925	.sel0_l (fcl_fdp_tinst_sel_ifq_s_l[3]),
926	.sel1_l (fcl_fdp_tinst_sel_curr_s_l[3]),
927	.sel2_l (fcl_fdp_tinst_sel_old_s_l[3]),
928	.sel3_l (fcl_fdp_tinst_sel_rb_s_l[3]));
929	`endif
930
931	// Thread Instruction Register
932	dff_s #(33) t0_inst_reg(.din (t0inst_s1),
933	.q (t0inst_s2),
934	.clk (clk), .se(se), .si(), .so());
935	`ifdef FPGA_SYN_1THREAD
936	assign inst_s2 = t0inst_s2;
937	`else
938	dff_s #(33) t1_inst_reg(.din (t1inst_s1),
939	.q (t1inst_s2),
940	.clk (clk), .se(se), .si(), .so());
941	dff_s #(33) t2_inst_reg(.din (t2inst_s1),
942	.q (t2inst_s2),
943	.clk (clk), .se(se), .si(), .so());
944	dff_s #(33) t3_inst_reg(.din (t3inst_s1),
945	.q (t3inst_s2),
946	.clk (clk), .se(se), .si(), .so());
947
948	// switch instruction mux -- choose the instruction to switch to
949	// fcl keep track of which t*inst_s2 is valid
950	dp_mux4ds #(33) swinst_mux(.dout (inst_s2),
951	.in0 (t0inst_s2),
952	.in1 (t1inst_s2),
953	.in2 (t2inst_s2),
954	.in3 (t3inst_s2),
955	.sel0_l (fcl_fdp_thr_s2_l[0]),
956	.sel1_l (fcl_fdp_thr_s2_l[1]),
957	.sel2_l (fcl_fdp_thr_s2_l[2]),
958	.sel3_l (fcl_fdp_thr_s2_l[3]));
959	`endif
960
961	// Rollback instruction
962	dff_s #(33) rbinst_d_reg(.din (fdp_inst_s[32:0]),
963	.q (inst_d),
964	.clk (clk),
965	.se (se), .si(), .so());
966
967	dff_s #(33) rbinst_e_reg(.din (inst_d),
968	.q (inst_e),
969	.clk (clk),
970	.se (se), .si(), .so());
971
972	dp_mux2es #(33) rbinst0_mux(.dout (rb_inst0_s),
973	.in0 (inst_d),
974	.in1 (inst_e),
975	.sel (fcl_fdp_rbinst_sel_inste_s[0]));
976
977	`ifdef FPGA_SYN_1THREAD
978	`else
979	dp_mux2es #(33) rbinst1_mux(.dout (rb_inst1_s),
980	.in0 (inst_d),
981	.in1 (inst_e),
982	.sel (fcl_fdp_rbinst_sel_inste_s[1]));
983
984	dp_mux2es #(33) rbinst2_mux(.dout (rb_inst2_s),
985	.in0 (inst_d),
986	.in1 (inst_e),
987	.sel (fcl_fdp_rbinst_sel_inste_s[2]));
988
989	dp_mux2es #(33) rbinst3_mux(.dout (rb_inst3_s),
990	.in0 (inst_d),
991	.in1 (inst_e),
992	.sel (fcl_fdp_rbinst_sel_inste_s[3]));
993	`endif
994
995	//----------------------------------------------------------------------
996	// Next Instruction Datapath
997	//----------------------------------------------------------------------
998
999	// Thread next instruction muxes
1000	// dp_mux2es #(33) t0nir_mux(.dout (t0nir_in),
1001	// .in0 (icd_fdp_topdata_s1[32:0]),
1002	// .in1 (t0nir),
1003	// .sel (fcl_fdp_thr_s1_l[0])); // 0=new
1004	// dp_mux2es #(33) t1nir_mux(.dout (t1nir_in),
1005	// .in0 (icd_fdp_topdata_s1[32:0]),
1006	// .in1 (t1nir),
1007	// .sel (fcl_fdp_thr_s1_l[1]));
1008	// dp_mux2es #(33) t2nir_mux(.dout (t2nir_in),
1009	// .in0 (icd_fdp_topdata_s1[32:0]),
1010	// .in1 (t2nir),
1011	// .sel (fcl_fdp_thr_s1_l[2]));
1012	// dp_mux2es #(33) t3nir_mux(.dout (t3nir_in),
1013	// .in0 (icd_fdp_topdata_s1[32:0]),
1014	// .in1 (t3nir),
1015	// .sel (fcl_fdp_thr_s1_l[3]));
1016
1017	// Thread Next Instruction Register
1018	wire clk_nir0;
1019	`ifdef FPGA_SYN_CLK_EN
1020	`else
1021
1022	bw_u1_ckenbuf_6x ckennir0(.rclk (rclk),
1023	.clk (clk_nir0),
1024	.en_l (fcl_fdp_thr_s1_l[0]),
1025	.tm_l (~se));
1026	`endif
1027	`ifdef FPGA_SYN_CLK_DFF
1028	dffe_s #(33) t0nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1029	.q (t0nir),
1030	.en (~(fcl_fdp_thr_s1_l[0])), .clk(rclk), .se(se), .si(), .so());
1031	`else
1032
1033	dff_s #(33) t0nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1034	.q (t0nir),
1035	.clk (clk_nir0), .se(se), .si(), .so());
1036	`endif
1037
1038	`ifdef FPGA_SYN_1THREAD
1039	assign nirdata_s1 = t0nir;
1040	`else
1041	wire clk_nir1;
1042	`ifdef FPGA_SYN_CLK_EN
1043	`else
1044
1045	bw_u1_ckenbuf_6x ckennir1(.rclk (rclk),
1046	.clk (clk_nir1),
1047	.en_l (fcl_fdp_thr_s1_l[1]),
1048	.tm_l (~se));
1049	`endif
1050	`ifdef FPGA_SYN_CLK_DFF
1051	dffe_s #(33) t1nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1052	.q (t1nir),
1053	.en (~(fcl_fdp_thr_s1_l[1])), .clk (rclk), .se(se), .si(), .so());
1054	`else
1055	dff_s #(33) t1nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1056	.q (t1nir),
1057	.clk (clk_nir1), .se(se), .si(), .so());
1058	`endif
1059
1060	wire clk_nir2;
1061	`ifdef FPGA_SYN_CLK_EN
1062	`else
1063
1064	bw_u1_ckenbuf_6x ckennir2(.rclk (rclk),
1065	.clk (clk_nir2),
1066	.en_l (fcl_fdp_thr_s1_l[2]),
1067	.tm_l (~se));
1068	`endif
1069	`ifdef FPGA_SYN_CLK_DFF
1070	dffe_s #(33) t2nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1071	.q (t2nir),
1072	.en (~(fcl_fdp_thr_s1_l[2])), .clk (rclk), .se(se), .si(), .so());
1073	`else
1074	dff_s #(33) t2nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1075	.q (t2nir),
1076	.clk (clk_nir2), .se(se), .si(), .so());
1077	`endif
1078	wire clk_nir3;
1079	`ifdef FPGA_SYN_CLK_EN
1080	`else
1081
1082	bw_u1_ckenbuf_6x ckennir3(.rclk (rclk),
1083	.clk (clk_nir3),
1084	.en_l (fcl_fdp_thr_s1_l[3]),
1085	.tm_l (~se));
1086	`endif
1087	`ifdef FPGA_SYN_CLK_DFF
1088	dffe_s #(33) t3nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1089	.q (t3nir),
1090	.en (~(fcl_fdp_thr_s1_l[3])), .clk (rclk), .se(se), .si(), .so());
1091	`else
1092
1093	dff_s #(33) t3nir_reg(.din (icd_fdp_topdata_s1[32:0]),
1094	.q (t3nir),
1095	.clk (clk_nir3), .se(se), .si(), .so());
1096	`endif
1097
1098	// Next thread NIR mux (nir output mux)
1099	dp_mux4ds #(33) nextnir_mux(.dout (nirdata_s1),
1100	.in0 (t0nir),
1101	.in1 (t1nir),
1102	.in2 (t2nir),
1103	.in3 (t3nir),
1104	.sel0_l (fcl_fdp_nirthr_s1_l[0]),
1105	.sel1_l (fcl_fdp_nirthr_s1_l[1]),
1106	.sel2_l (fcl_fdp_nirthr_s1_l[2]),
1107	.sel3_l (fcl_fdp_nirthr_s1_l[3]));
1108	`endif
1109
1110	// TBD in fetched instruction DP:
1111	// 1. Rollback -- DONE
1112	// 2. Icache parity check (increase fet data and top data to 34 bits)
1113
1114	endmodule // sparc_ifu_fdp
1115

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source: XOpenSparcT1/trunk/T1-CPU/ifu/sparc_ifu_fdp.v @ 6

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