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fpu_div_ctl.v @ 6

Revision 6, 49.7 KB checked in by pntsvt00, 13 years ago (diff)
versione iniziale opensparc

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1	// ========== Copyright Header Begin ==========================================
2	//
3	// OpenSPARC T1 Processor File: fpu_div_ctl.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	// Divide pipeline synthesizable logic
24	// - special input cases
25	// - opcode pipeline
26	// - sign logic
27	// - exception logic
28	// - datapath control- select lines and control logic
29	//
30	///////////////////////////////////////////////////////////////////////////////
31
32	module fpu_div_ctl (
33	inq_in1_51,
34	inq_in1_54,
35	inq_in1_53_0_neq_0,
36	inq_in1_50_0_neq_0,
37	inq_in1_53_32_neq_0,
38	inq_in1_exp_eq_0,
39	inq_in1_exp_neq_ffs,
40	inq_in2_51,
41	inq_in2_54,
42	inq_in2_53_0_neq_0,
43	inq_in2_50_0_neq_0,
44	inq_in2_53_32_neq_0,
45	inq_in2_exp_eq_0,
46	inq_in2_exp_neq_ffs,
47	inq_op,
48	div_exp1,
49	div_dest_rdy,
50	inq_rnd_mode,
51	inq_id,
52	inq_in1_63,
53	inq_in2_63,
54	inq_div,
55	div_exp_out,
56	div_frac_add_52_inva,
57	div_frac_add_in1_neq_0,
58	div_frac_out_54,
59	d6stg_frac_0,
60	d6stg_frac_1,
61	d6stg_frac_2,
62	d6stg_frac_29,
63	d6stg_frac_30,
64	d6stg_frac_31,
65	div_frac_out_53,
66	div_expadd2_12,
67	arst_l,
68	grst_l,
69	rclk,
70
71	div_pipe_active,
72	d1stg_snan_sng_in1,
73	d1stg_snan_dbl_in1,
74	d1stg_snan_sng_in2,
75	d1stg_snan_dbl_in2,
76	d1stg_step,
77	d1stg_dblop,
78	d234stg_fdiv,
79	d3stg_fdiv,
80	d4stg_fdiv,
81	d5stg_fdiva,
82	d5stg_fdivb,
83	d5stg_fdivs,
84	d5stg_fdivd,
85	d6stg_fdiv,
86	d6stg_fdivs,
87	d6stg_fdivd,
88	d7stg_fdiv,
89	d7stg_fdivd,
90	d8stg_fdiv_in,
91	d8stg_fdivs,
92	d8stg_fdivd,
93	div_id_out_in,
94	div_sign_out,
95	div_exc_out,
96	div_norm_frac_in1_dbl_norm,
97	div_norm_frac_in1_dbl_dnrm,
98	div_norm_frac_in1_sng_norm,
99	div_norm_frac_in1_sng_dnrm,
100	div_norm_frac_in2_dbl_norm,
101	div_norm_frac_in2_dbl_dnrm,
102	div_norm_frac_in2_sng_norm,
103	div_norm_frac_in2_sng_dnrm,
104	div_norm_inf,
105	div_norm_qnan,
106	div_norm_zero,
107	div_frac_add_in2_load,
108	d6stg_frac_out_shl1,
109	d6stg_frac_out_nosh,
110	div_frac_add_in1_add,
111	div_frac_add_in1_load,
112	d7stg_rndup_inv,
113	d7stg_to_0,
114	d7stg_to_0_inv,
115	div_frac_out_add_in1,
116	div_frac_out_add,
117	div_frac_out_shl1_dbl,
118	div_frac_out_shl1_sng,
119	div_frac_out_of,
120	div_frac_out_load,
121	div_expadd1_in1_dbl,
122	div_expadd1_in1_sng,
123	div_expadd1_in2_exp_in2_dbl,
124	div_expadd1_in2_exp_in2_sng,
125	div_exp1_expadd1,
126	div_exp1_0835,
127	div_exp1_0118,
128	div_exp1_zero,
129	div_exp1_load,
130	div_expadd2_in1_exp_out,
131	div_expadd2_no_decr_inv,
132	div_expadd2_cin,
133	div_exp_out_expadd22_inv,
134	div_exp_out_expadd2,
135	div_exp_out_of,
136	div_exp_out_exp_out,
137	div_exp_out_load,
138
139	se,
140	si,
141	so
142	);
143
144
145	parameter
146	FDIVS= 8'h4d,
147	FDIVD= 8'h4e;
148
149
150	input inq_in1_51; // request operand 1[51]
151	input inq_in1_54; // request operand 1[54]
152	input inq_in1_53_0_neq_0; // request operand 1[53:0]!=0
153	input inq_in1_50_0_neq_0; // request operand 1[50:0]!=0
154	input inq_in1_53_32_neq_0; // request operand 1[53:32]!=0
155	input inq_in1_exp_eq_0; // request operand 1[62:52]==0
156	input inq_in1_exp_neq_ffs; // request operand 1[62:52]!=0x7ff
157	input inq_in2_51; // request operand 2[51]
158	input inq_in2_54; // request operand 2[54]
159	input inq_in2_53_0_neq_0; // request operand 2[53:0]!=0
160	input inq_in2_50_0_neq_0; // request operand 2[50:0]!=0
161	input inq_in2_53_32_neq_0; // request operand 2[53:32]!=0
162	input inq_in2_exp_eq_0; // request operand 2[62:52]==0
163	input inq_in2_exp_neq_ffs; // request operand 2[62:52]!=0x7ff
164	input [7:0] inq_op; // request opcode to op pipes
165	input [12:0] div_exp1; // divide exponent- intermediate value
166	input div_dest_rdy; // divide result req accepted for CPX
167	input [1:0] inq_rnd_mode; // request rounding mode to op pipes
168	input [4:0] inq_id; // request ID to the operation pipes
169	input inq_in1_63; // request operand 1 to op pipes- sign
170	input inq_in2_63; // request operand 2 to op pipes- sign
171	input inq_div; // divide pipe request
172	input [12:0] div_exp_out; // divide exponent output
173	input div_frac_add_52_inva; // div_frac_add bit[52] inverted
174	input div_frac_add_in1_neq_0; // div_frac_add_in1 != 0
175	input div_frac_out_54; // div_frac_out bit[54]
176	input d6stg_frac_0; // divide fraction[0]- intermediate val
177	input d6stg_frac_1; // divide fraction[1]- intermediate val
178	input d6stg_frac_2; // divide fraction[2]- intermediate val
179	input d6stg_frac_29; // divide fraction[29]- intermediate val
180	input d6stg_frac_30; // divide fraction[30]- intermediate val
181	input d6stg_frac_31; // divide fraction[31]- intermediate val
182	input div_frac_out_53; // div_frac_out bit[53]
183	input div_expadd2_12; // div_expadd2 bit[12]
184	input arst_l; // global async. reset- asserted low
185	input grst_l; // global sync. reset- asserted low
186	input rclk; // global clock
187
188	output div_pipe_active; // div pipe is executing a valid instr
189	output d1stg_snan_sng_in1; // operand 1 is single signalling NaN
190	output d1stg_snan_dbl_in1; // operand 1 is double signalling NaN
191	output d1stg_snan_sng_in2; // operand 2 is single signalling NaN
192	output d1stg_snan_dbl_in2; // operand 2 is double signalling NaN
193	output d1stg_step; // divide pipe load
194	output d1stg_dblop; // double precision operation- d1 stg
195	output d234stg_fdiv; // select line to div_expadd1
196	output d3stg_fdiv; // divide operation- divide stage 3
197	output d4stg_fdiv; // divide operation- divide stage 4
198	output d5stg_fdiva; // divide operation- divide stage 5
199	output d5stg_fdivb; // divide operation- divide stage 5
200	output d5stg_fdivs; // divide single- divide stage 5
201	output d5stg_fdivd; // divide double- divide stage 5
202	output d6stg_fdiv; // divide operation- divide stage 6
203	output d6stg_fdivs; // divide single- divide stage 6
204	output d6stg_fdivd; // divide double- divide stage 6
205	output d7stg_fdiv; // divide operation- divide stage 7
206	output d7stg_fdivd; // divide double- divide stage 7
207	output d8stg_fdiv_in; // div pipe output request next cycle
208	output d8stg_fdivs; // divide single- divide stage 8
209	output d8stg_fdivd; // divide double- divide stage 8
210	output [9:0] div_id_out_in; // div pipe output ID next cycle
211	output div_sign_out; // divide sign output
212	output [4:0] div_exc_out; // divide pipe result- exception flags
213	output div_norm_frac_in1_dbl_norm; // select line to div_norm
214	output div_norm_frac_in1_dbl_dnrm; // select line to div_norm
215	output div_norm_frac_in1_sng_norm; // select line to div_norm
216	output div_norm_frac_in1_sng_dnrm; // select line to div_norm
217	output div_norm_frac_in2_dbl_norm; // select line to div_norm
218	output div_norm_frac_in2_dbl_dnrm; // select line to div_norm
219	output div_norm_frac_in2_sng_norm; // select line to div_norm
220	output div_norm_frac_in2_sng_dnrm; // select line to div_norm
221	output div_norm_inf; // select line to div_norm
222	output div_norm_qnan; // select line to div_norm
223	output div_norm_zero; // select line to div_norm
224	output div_frac_add_in2_load; // load enable to div_frac_add_in2
225	output d6stg_frac_out_shl1; // select line to d6stg_frac
226	output d6stg_frac_out_nosh; // select line to d6stg_frac
227	output div_frac_add_in1_add; // select line to div_frac_add_in1
228	output div_frac_add_in1_load; // load enable to div_frac_add_in1
229	output d7stg_rndup_inv; // no rounding increment
230	output d7stg_to_0; // result to max finite on overflow
231	output d7stg_to_0_inv; // result to infinity on overflow
232	output div_frac_out_add_in1; // select line to div_frac_out
233	output div_frac_out_add; // select line to div_frac_out
234	output div_frac_out_shl1_dbl; // select line to div_frac_out
235	output div_frac_out_shl1_sng; // select line to div_frac_out
236	output div_frac_out_of; // select line to div_frac_out
237	output div_frac_out_load; // load enable to div_frac_out
238	output div_expadd1_in1_dbl; // select line to div_expadd1
239	output div_expadd1_in1_sng; // select line to div_expadd1
240	output div_expadd1_in2_exp_in2_dbl; // select line to div_expadd1
241	output div_expadd1_in2_exp_in2_sng; //select line to div_expadd1
242	output div_exp1_expadd1; // select line to div_exp1
243	output div_exp1_0835; // select line to div_exp1
244	output div_exp1_0118; // select line to div_exp1
245	output div_exp1_zero; // select line to div_exp1
246	output div_exp1_load; // load enable to div_exp1
247	output div_expadd2_in1_exp_out; // select line to div_expadd2
248	output div_expadd2_no_decr_inv; // no exponent decrement
249	output div_expadd2_cin; // carry in to 2nd exponent adder
250	output div_exp_out_expadd22_inv; // select line to div_exp_out
251	output div_exp_out_expadd2; // select line to div_exp_out
252	output div_exp_out_of; // overflow to exponent output
253	output div_exp_out_exp_out; // select line to div_exp_out
254	output div_exp_out_load; // load enable to div_exp_out
255
256	input se; // scan_enable
257	input si; // scan in
258	output so; // scan out
259
260
261	wire reset;
262	wire div_frac_in1_51;
263	wire div_frac_in1_54;
264	wire div_frac_in1_53_0_neq_0;
265	wire div_frac_in1_50_0_neq_0;
266	wire div_frac_in1_53_32_neq_0;
267	wire div_exp_in1_exp_eq_0;
268	wire div_exp_in1_exp_neq_ffs;
269	wire div_frac_in2_51;
270	wire div_frac_in2_54;
271	wire div_frac_in2_53_0_neq_0;
272	wire div_frac_in2_50_0_neq_0;
273	wire div_frac_in2_53_32_neq_0;
274	wire div_exp_in2_exp_eq_0;
275	wire div_exp_in2_exp_neq_ffs;
276	wire d1stg_denorm_sng_in1;
277	wire d1stg_denorm_dbl_in1;
278	wire d1stg_denorm_sng_in2;
279	wire d1stg_denorm_dbl_in2;
280	wire d2stg_denorm_sng_in2;
281	wire d2stg_denorm_dbl_in2;
282	wire d1stg_norm_sng_in1;
283	wire d1stg_norm_dbl_in1;
284	wire d1stg_norm_sng_in2;
285	wire d1stg_norm_dbl_in2;
286	wire d2stg_norm_sng_in2;
287	wire d2stg_norm_dbl_in2;
288	wire d1stg_snan_sng_in1;
289	wire d1stg_snan_dbl_in1;
290	wire d1stg_snan_sng_in2;
291	wire d1stg_snan_dbl_in2;
292	wire d1stg_qnan_sng_in1;
293	wire d1stg_qnan_dbl_in1;
294	wire d1stg_qnan_sng_in2;
295	wire d1stg_qnan_dbl_in2;
296	wire d1stg_snan_in1;
297	wire d1stg_snan_in2;
298	wire d1stg_qnan_in1;
299	wire d1stg_qnan_in2;
300	wire d1stg_nan_sng_in1;
301	wire d1stg_nan_dbl_in1;
302	wire d1stg_nan_sng_in2;
303	wire d1stg_nan_dbl_in2;
304	wire d1stg_nan_in1;
305	wire d1stg_nan_in2;
306	wire d1stg_nan_in;
307	wire d2stg_snan_in1;
308	wire d2stg_snan_in2;
309	wire d2stg_qnan_in1;
310	wire d2stg_qnan_in2;
311	wire d2stg_nan_in2;
312	wire d2stg_nan_in;
313	wire d1stg_inf_sng_in1;
314	wire d1stg_inf_dbl_in1;
315	wire d1stg_inf_sng_in2;
316	wire d1stg_inf_dbl_in2;
317	wire d1stg_inf_in1;
318	wire d1stg_inf_in2;
319	wire d1stg_inf_in;
320	wire d1stg_2inf_in;
321	wire d2stg_inf_in1;
322	wire d2stg_inf_in2;
323	wire d2stg_2inf_in;
324	wire d1stg_infnan_sng_in1;
325	wire d1stg_infnan_dbl_in1;
326	wire d1stg_infnan_sng_in2;
327	wire d1stg_infnan_dbl_in2;
328	wire d1stg_infnan_in1;
329	wire d1stg_infnan_in2;
330	wire d1stg_infnan_in;
331	wire d2stg_infnan_in1;
332	wire d2stg_infnan_in2;
333	wire d2stg_infnan_in;
334	wire d1stg_zero_in1;
335	wire d1stg_zero_in2;
336	wire d1stg_zero_in;
337	wire d1stg_2zero_in;
338	wire d2stg_zero_in1;
339	wire d2stg_zero_in2;
340	wire d2stg_zero_in;
341	wire d2stg_2zero_in;
342	wire d1stg_hold;
343	wire d1stg_holda;
344	wire d1stg_step;
345	wire d1stg_stepa;
346	wire [7:0] d1stg_op_in;
347	wire [7:0] d1stg_op;
348	wire d1stg_div_in;
349	wire d1stg_div;
350	wire [4:0] d1stg_sngopa;
351	wire d1stg_dblop;
352	wire [4:0] d1stg_dblopa;
353	wire d1stg_fdiv;
354	wire d1stg_fdivs;
355	wire d1stg_fdivd;
356	wire [2:0] d1stg_opdec;
357	wire d234stg_fdiv_in;
358	wire [2:0] d2stg_opdec;
359	wire d234stg_fdiv;
360	wire d2stg_fdiv;
361	wire d2stg_fdivs;
362	wire d2stg_fdivd;
363	wire [2:0] d3stg_opdec;
364	wire d3stg_fdiv;
365	wire [2:0] d4stg_opdec;
366	wire d4stg_fdiv;
367	wire d4stg_fdivs;
368	wire d4stg_fdivd;
369	wire d5stg_step;
370	wire [2:0] d5stg_opdec;
371	wire d5stg_fdiva;
372	wire d5stg_fdivb_in;
373	wire d5stg_fdivb;
374	wire d5stg_fdiv;
375	wire d5stg_fdivs;
376	wire d5stg_fdivd;
377	wire d6stg_step;
378	wire [2:0] d6stg_opdec_in;
379	wire [2:0] d6stg_opdec;
380	wire d6stg_fdiv;
381	wire d6stg_fdivs;
382	wire d6stg_fdivd;
383	wire [2:0] d7stg_opdec;
384	wire d7stg_fdiv;
385	wire d7stg_fdivs;
386	wire d7stg_fdivd;
387	wire d8stg_fdiv_in;
388	wire [2:0] d8stg_opdec;
389	wire d8stg_fdiv;
390	wire d8stg_fdivs;
391	wire d8stg_fdivd;
392	wire d8stg_hold;
393	wire d8stg_step;
394	wire [1:0] d1stg_rnd_mode;
395	wire [4:0] d1stg_id;
396	wire d1stg_sign1;
397	wire d1stg_sign2;
398	wire d1stg_sign;
399	wire div_bkend_step;
400	wire [1:0] div_rnd_mode;
401	wire [9:0] div_id_out_in;
402	wire [9:0] div_id_out;
403	wire div_sign_out;
404	wire [5:0] div_cnt_plus1;
405	wire [5:0] div_cnt_in;
406	wire div_cnt_step;
407	wire [5:0] div_cnt;
408	wire div_cnt_lt_step;
409	wire divs_cnt_lt_23_in;
410	wire divs_cnt_lt_23;
411	wire divs_cnt_lt_23a;
412	wire divd_cnt_lt_52_in;
413	wire divd_cnt_lt_52;
414	wire divd_cnt_lt_52a;
415	wire div_exc_step;
416	wire div_of_mask_in;
417	wire div_of_mask;
418	wire div_nv_out_in;
419	wire div_nv_out;
420	wire div_dz_out_in;
421	wire div_dz_out;
422	wire d7stg_in_of;
423	wire div_of_out_tmp1_in;
424	wire div_of_out_tmp1;
425	wire div_of_out_tmp2;
426	wire div_out_52_inv;
427	wire div_of_out;
428	wire div_uf_out_in;
429	wire div_uf_out;
430	wire div_nx_out_in;
431	wire div_nx_out;
432	wire [4:0] div_exc_out;
433	wire d1stg_spc_rslt;
434	wire div_norm_frac_in1_dbl_norm;
435	wire div_norm_frac_in1_dbl_dnrm;
436	wire div_norm_frac_in1_sng_norm;
437	wire div_norm_frac_in1_sng_dnrm;
438	wire div_norm_frac_in2_dbl_norm;
439	wire div_norm_frac_in2_dbl_dnrm;
440	wire div_norm_frac_in2_sng_norm;
441	wire div_norm_frac_in2_sng_dnrm;
442	wire div_norm_inf;
443	wire div_norm_qnan;
444	wire div_norm_zero;
445	wire div_frac_add_in2_load;
446	wire d6stg_frac_out_shl1;
447	wire d6stg_frac_out_nosh;
448	wire div_frac_add_in1_add;
449	wire div_frac_add_in1_load;
450	wire d7stg_lsb_in;
451	wire d7stg_grd_in;
452	wire d7stg_stk_in;
453	wire d7stg_lsb;
454	wire d7stg_grd;
455	wire d7stg_stk;
456	wire d7stg_rndup;
457	wire d7stg_rndup_inv;
458	wire d7stg_to_0;
459	wire d7stg_to_0_inv;
460	wire div_frac_out_add_in1;
461	wire div_frac_out_add;
462	wire div_frac_out_shl1_dbl;
463	wire div_frac_out_shl1_sng;
464	wire div_frac_out_of;
465	wire div_frac_out_load;
466	wire div_expadd1_in1_dbl_in;
467	wire div_expadd1_in1_dbl;
468	wire div_expadd1_in1_sng_in;
469	wire div_expadd1_in1_sng;
470	wire div_expadd1_in2_exp_in2_dbl;
471	wire div_expadd1_in2_exp_in2_sng;
472	wire div_exp1_expadd1;
473	wire div_exp1_0835;
474	wire div_exp1_0118;
475	wire div_exp1_zero;
476	wire d2stg_max_exp;
477	wire d2stg_zero_exp;
478	wire div_exp1_load;
479	wire div_expadd2_in1_exp_out_in;
480	wire div_expadd2_in1_exp_out;
481	wire div_expadd2_no_decr_inv_in;
482	wire div_expadd2_no_decr_load;
483	wire div_expadd2_no_decr_inv;
484	wire div_expadd2_cin;
485	wire div_exp_out_zero;
486	wire div_exp_out_expadd22_inv;
487	wire div_exp_out_expadd2;
488	wire div_exp_out_of;
489	wire div_exp_out_exp_out;
490	wire div_exp_out_load;
491	wire div_pipe_active_in;
492	wire div_pipe_active;
493
494
495	dffrl_async #(1) dffrl_div_ctl (
496	.din (grst_l),
497	.clk (rclk),
498	.rst_l(arst_l),
499	.q (div_ctl_rst_l),
500	.se (se),
501	.si (),
502	.so ()
503	);
504
505	assign reset= (!div_ctl_rst_l);
506
507	///////////////////////////////////////////////////////////////////////////////
508	//
509	// Divide pipeline special input cases.
510	//
511	///////////////////////////////////////////////////////////////////////////////
512
513	dffe_s #(1) i_div_frac_in1_51 (
514	.din (inq_in1_51),
515	.en (d1stg_step),
516	.clk (rclk),
517
518	.q (div_frac_in1_51),
519
520	.se (se),
521	.si (),
522	.so ()
523	);
524
525	dffe_s #(1) i_div_frac_in1_54 (
526	.din (inq_in1_54),
527	.en (d1stg_step),
528	.clk (rclk),
529
530	.q (div_frac_in1_54),
531
532	.se (se),
533	.si (),
534	.so ()
535	);
536
537	dffe_s #(1) i_div_frac_in1_53_0_neq_0 (
538	.din (inq_in1_53_0_neq_0),
539	.en (d1stg_step),
540	.clk (rclk),
541
542	.q (div_frac_in1_53_0_neq_0),
543
544	.se (se),
545	.si (),
546	.so ()
547	);
548
549	dffe_s #(1) i_div_frac_in1_50_0_neq_0 (
550	.din (inq_in1_50_0_neq_0),
551	.en (d1stg_step),
552	.clk (rclk),
553
554	.q (div_frac_in1_50_0_neq_0),
555
556	.se (se),
557	.si (),
558	.so ()
559	);
560
561	dffe_s #(1) i_div_frac_in1_53_32_neq_0 (
562	.din (inq_in1_53_32_neq_0),
563	.en (d1stg_step),
564	.clk (rclk),
565
566	.q (div_frac_in1_53_32_neq_0),
567
568	.se (se),
569	.si (),
570	.so ()
571	);
572
573	dffe_s #(1) i_div_exp_in1_exp_eq_0 (
574	.din (inq_in1_exp_eq_0),
575	.en (d1stg_step),
576	.clk (rclk),
577
578	.q (div_exp_in1_exp_eq_0),
579
580	.se (se),
581	.si (),
582	.so ()
583	);
584
585	dffe_s #(1) i_div_exp_in1_exp_neq_ffs (
586	.din (inq_in1_exp_neq_ffs),
587	.en (d1stg_step),
588	.clk (rclk),
589
590	.q (div_exp_in1_exp_neq_ffs),
591
592	.se (se),
593	.si (),
594	.so ()
595	);
596
597	dffe_s #(1) i_div_frac_in2_51 (
598	.din (inq_in2_51),
599	.en (d1stg_step),
600	.clk (rclk),
601
602	.q (div_frac_in2_51),
603
604	.se (se),
605	.si (),
606	.so ()
607	);
608
609	dffe_s #(1) i_div_frac_in2_54 (
610	.din (inq_in2_54),
611	.en (d1stg_step),
612	.clk (rclk),
613
614	.q (div_frac_in2_54),
615
616	.se (se),
617	.si (),
618	.so ()
619	);
620
621	dffe_s #(1) i_div_frac_in2_53_0_neq_0 (
622	.din (inq_in2_53_0_neq_0),
623	.en (d1stg_step),
624	.clk (rclk),
625
626	.q (div_frac_in2_53_0_neq_0),
627
628	.se (se),
629	.si (),
630	.so ()
631	);
632
633	dffe_s #(1) i_div_frac_in2_50_0_neq_0 (
634	.din (inq_in2_50_0_neq_0),
635	.en (d1stg_step),
636	.clk (rclk),
637
638	.q (div_frac_in2_50_0_neq_0),
639
640	.se (se),
641	.si (),
642	.so ()
643	);
644
645	dffe_s #(1) i_div_frac_in2_53_32_neq_0 (
646	.din (inq_in2_53_32_neq_0),
647	.en (d1stg_step),
648	.clk (rclk),
649
650	.q (div_frac_in2_53_32_neq_0),
651
652	.se (se),
653	.si (),
654	.so ()
655	);
656
657	dffe_s #(1) i_div_exp_in2_exp_eq_0 (
658	.din (inq_in2_exp_eq_0),
659	.en (d1stg_step),
660	.clk (rclk),
661
662	.q (div_exp_in2_exp_eq_0),
663
664	.se (se),
665	.si (),
666	.so ()
667	);
668
669	dffe_s #(1) i_div_exp_in2_exp_neq_ffs (
670	.din (inq_in2_exp_neq_ffs),
671	.en (d1stg_step),
672	.clk (rclk),
673
674	.q (div_exp_in2_exp_neq_ffs),
675
676	.se (se),
677	.si (),
678	.so ()
679	);
680
681
682	///////////////////////////////////////////////////////////////////////////////
683	//
684	// Denorm divide inputs.
685	//
686	///////////////////////////////////////////////////////////////////////////////
687
688	assign d1stg_denorm_sng_in1= div_exp_in1_exp_eq_0 && d1stg_sngopa[0];
689
690	assign d1stg_denorm_dbl_in1= div_exp_in1_exp_eq_0 && d1stg_dblopa[0];
691
692	assign d1stg_denorm_sng_in2= div_exp_in2_exp_eq_0 && d1stg_sngopa[0];
693
694	assign d1stg_denorm_dbl_in2= div_exp_in2_exp_eq_0 && d1stg_dblopa[0];
695
696	dff_s #(1) i_d2stg_denorm_sng_in2 (
697	.din (d1stg_denorm_sng_in2),
698	.clk (rclk),
699
700	.q (d2stg_denorm_sng_in2),
701
702	.se (se),
703	.si (),
704	.so ()
705	);
706
707	dff_s #(1) i_d2stg_denorm_dbl_in2 (
708	.din (d1stg_denorm_dbl_in2),
709	.clk (rclk),
710
711	.q (d2stg_denorm_dbl_in2),
712
713	.se (se),
714	.si (),
715	.so ()
716	);
717
718
719	///////////////////////////////////////////////////////////////////////////////
720	//
721	// Non-denorm divide inputs.
722	//
723	///////////////////////////////////////////////////////////////////////////////
724
725	assign d1stg_norm_sng_in1= (!div_exp_in1_exp_eq_0) && d1stg_sngopa[0];
726
727	assign d1stg_norm_dbl_in1= (!div_exp_in1_exp_eq_0) && d1stg_dblopa[0];
728
729	assign d1stg_norm_sng_in2= (!div_exp_in2_exp_eq_0) && d1stg_sngopa[0];
730
731	assign d1stg_norm_dbl_in2= (!div_exp_in2_exp_eq_0) && d1stg_dblopa[0];
732
733	dff_s #(1) i_d2stg_norm_sng_in2 (
734	.din (d1stg_norm_sng_in2),
735	.clk (rclk),
736
737	.q (d2stg_norm_sng_in2),
738
739	.se (se),
740	.si (),
741	.so ()
742	);
743
744	dff_s #(1) i_d2stg_norm_dbl_in2 (
745	.din (d1stg_norm_dbl_in2),
746	.clk (rclk),
747
748	.q (d2stg_norm_dbl_in2),
749
750	.se (se),
751	.si (),
752	.so ()
753	);
754
755
756	///////////////////////////////////////////////////////////////////////////////
757	//
758	// Nan divide inputs.
759	//
760	///////////////////////////////////////////////////////////////////////////////
761
762	assign d1stg_snan_sng_in1= (!div_exp_in1_exp_neq_ffs) && (!div_frac_in1_54)
763	&& div_frac_in1_53_32_neq_0 && d1stg_sngopa[1];
764
765	assign d1stg_snan_dbl_in1= (!div_exp_in1_exp_neq_ffs) && (!div_frac_in1_51)
766	&& div_frac_in1_50_0_neq_0 && d1stg_dblopa[1];
767
768	assign d1stg_snan_sng_in2= (!div_exp_in2_exp_neq_ffs) && (!div_frac_in2_54)
769	&& div_frac_in2_53_32_neq_0 && d1stg_sngopa[1];
770
771	assign d1stg_snan_dbl_in2= (!div_exp_in2_exp_neq_ffs) && (!div_frac_in2_51)
772	&& div_frac_in2_50_0_neq_0 && d1stg_dblopa[1];
773
774	assign d1stg_qnan_sng_in1= (!div_exp_in1_exp_neq_ffs) && div_frac_in1_54
775	&& d1stg_sngopa[1];
776
777	assign d1stg_qnan_dbl_in1= (!div_exp_in1_exp_neq_ffs) && div_frac_in1_51
778	&& d1stg_dblopa[1];
779
780	assign d1stg_qnan_sng_in2= (!div_exp_in2_exp_neq_ffs) && div_frac_in2_54
781	&& d1stg_sngopa[1];
782
783	assign d1stg_qnan_dbl_in2= (!div_exp_in2_exp_neq_ffs) && div_frac_in2_51
784	&& d1stg_dblopa[1];
785
786	assign d1stg_snan_in1= d1stg_snan_sng_in1 \|\| d1stg_snan_dbl_in1;
787
788	assign d1stg_snan_in2= d1stg_snan_sng_in2 \|\| d1stg_snan_dbl_in2;
789
790	assign d1stg_qnan_in1= d1stg_qnan_sng_in1 \|\| d1stg_qnan_dbl_in1;
791
792	assign d1stg_qnan_in2= d1stg_qnan_sng_in2 \|\| d1stg_qnan_dbl_in2;
793
794	assign d1stg_nan_sng_in1= (!div_exp_in1_exp_neq_ffs)
795	&& (div_frac_in1_54 \|\| div_frac_in1_53_32_neq_0)
796	&& d1stg_sngopa[2];
797
798	assign d1stg_nan_dbl_in1= (!div_exp_in1_exp_neq_ffs)
799	&& (div_frac_in1_51 \|\| div_frac_in1_50_0_neq_0)
800	&& d1stg_dblopa[2];
801
802	assign d1stg_nan_sng_in2= (!div_exp_in2_exp_neq_ffs)
803	&& (div_frac_in2_54 \|\| div_frac_in2_53_32_neq_0)
804	&& d1stg_sngopa[2];
805
806	assign d1stg_nan_dbl_in2= (!div_exp_in2_exp_neq_ffs)
807	&& (div_frac_in2_51 \|\| div_frac_in2_50_0_neq_0)
808	&& d1stg_dblopa[2];
809
810	assign d1stg_nan_in1= d1stg_nan_sng_in1 \|\| d1stg_nan_dbl_in1;
811
812	assign d1stg_nan_in2= d1stg_nan_sng_in2 \|\| d1stg_nan_dbl_in2;
813
814	assign d1stg_nan_in= d1stg_nan_in1 \|\| d1stg_nan_in2;
815
816	dff_s #(1) i_d2stg_snan_in1 (
817	.din (d1stg_snan_in1),
818	.clk (rclk),
819
820	.q (d2stg_snan_in1),
821
822	.se (se),
823	.si (),
824	.so ()
825	);
826
827	dff_s #(1) i_d2stg_snan_in2 (
828	.din (d1stg_snan_in2),
829	.clk (rclk),
830
831	.q (d2stg_snan_in2),
832
833	.se (se),
834	.si (),
835	.so ()
836	);
837
838	dff_s #(1) i_d2stg_qnan_in1 (
839	.din (d1stg_qnan_in1),
840	.clk (rclk),
841
842	.q (d2stg_qnan_in1),
843
844	.se (se),
845	.si (),
846	.so ()
847	);
848
849	dff_s #(1) i_d2stg_qnan_in2 (
850	.din (d1stg_qnan_in2),
851	.clk (rclk),
852
853	.q (d2stg_qnan_in2),
854
855	.se (se),
856	.si (),
857	.so ()
858	);
859
860	dff_s #(1) i_d2stg_nan_in2 (
861	.din (d1stg_nan_in2),
862	.clk (rclk),
863
864	.q (d2stg_nan_in2),
865
866	.se (se),
867	.si (),
868	.so ()
869	);
870
871	dff_s #(1) i_d2stg_nan_in (
872	.din (d1stg_nan_in),
873	.clk (rclk),
874
875	.q (d2stg_nan_in),
876
877	.se (se),
878	.si (),
879	.so ()
880	);
881
882
883	///////////////////////////////////////////////////////////////////////////////
884	//
885	// Infinity divide inputs.
886	//
887	///////////////////////////////////////////////////////////////////////////////
888
889	assign d1stg_inf_sng_in1= (!div_exp_in1_exp_neq_ffs)
890	&& (!div_frac_in1_54) && (!div_frac_in1_53_32_neq_0)
891	&& d1stg_sngopa[2];
892
893	assign d1stg_inf_dbl_in1= (!div_exp_in1_exp_neq_ffs)
894	&& (!div_frac_in1_51) && (!div_frac_in1_50_0_neq_0)
895	&& d1stg_dblopa[2];
896
897	assign d1stg_inf_sng_in2= (!div_exp_in2_exp_neq_ffs)
898	&& (!div_frac_in2_54) && (!div_frac_in2_53_32_neq_0)
899	&& d1stg_sngopa[2];
900
901	assign d1stg_inf_dbl_in2= (!div_exp_in2_exp_neq_ffs)
902	&& (!div_frac_in2_51) && (!div_frac_in2_50_0_neq_0)
903	&& d1stg_dblopa[2];
904
905	assign d1stg_inf_in1= d1stg_inf_sng_in1 \|\| d1stg_inf_dbl_in1;
906
907	assign d1stg_inf_in2= d1stg_inf_sng_in2 \|\| d1stg_inf_dbl_in2;
908
909	assign d1stg_inf_in= d1stg_inf_in1 \|\| d1stg_inf_in2;
910
911	assign d1stg_2inf_in= d1stg_inf_in1 && d1stg_inf_in2;
912
913	dff_s #(1) i_d2stg_inf_in1 (
914	.din (d1stg_inf_in1),
915	.clk (rclk),
916
917	.q (d2stg_inf_in1),
918
919	.se (se),
920	.si (),
921	.so ()
922	);
923
924	dff_s #(1) i_d2stg_inf_in2 (
925	.din (d1stg_inf_in2),
926	.clk (rclk),
927
928	.q (d2stg_inf_in2),
929
930	.se (se),
931	.si (),
932	.so ()
933	);
934
935	dff_s #(1) i_d2stg_2inf_in (
936	.din (d1stg_2inf_in),
937	.clk (rclk),
938
939	.q (d2stg_2inf_in),
940
941	.se (se),
942	.si (),
943	.so ()
944	);
945
946
947	///////////////////////////////////////////////////////////////////////////////
948	//
949	// Infinity/Nan divide inputs.
950	//
951	///////////////////////////////////////////////////////////////////////////////
952
953	assign d1stg_infnan_sng_in1= (!div_exp_in1_exp_neq_ffs) && d1stg_sngopa[3];
954
955	assign d1stg_infnan_dbl_in1= (!div_exp_in1_exp_neq_ffs) && d1stg_dblopa[3];
956
957	assign d1stg_infnan_sng_in2= (!div_exp_in2_exp_neq_ffs) && d1stg_sngopa[3];
958
959	assign d1stg_infnan_dbl_in2= (!div_exp_in2_exp_neq_ffs) && d1stg_dblopa[3];
960
961	assign d1stg_infnan_in1= d1stg_infnan_sng_in1 \|\| d1stg_infnan_dbl_in1;
962
963	assign d1stg_infnan_in2= d1stg_infnan_sng_in2 \|\| d1stg_infnan_dbl_in2;
964
965	assign d1stg_infnan_in= d1stg_infnan_in1 \|\| d1stg_infnan_in2;
966
967	dff_s #(1) i_d2stg_infnan_in1 (
968	.din (d1stg_infnan_in1),
969	.clk (rclk),
970
971	.q (d2stg_infnan_in1),
972
973	.se (se),
974	.si (),
975	.so ()
976	);
977
978	dff_s #(1) i_d2stg_infnan_in2 (
979	.din (d1stg_infnan_in2),
980	.clk (rclk),
981
982	.q (d2stg_infnan_in2),
983
984	.se (se),
985	.si (),
986	.so ()
987	);
988
989	dff_s #(1) i_d2stg_infnan_in (
990	.din (d1stg_infnan_in),
991	.clk (rclk),
992
993	.q (d2stg_infnan_in),
994
995	.se (se),
996	.si (),
997	.so ()
998	);
999
1000
1001	///////////////////////////////////////////////////////////////////////////////
1002	//
1003	// Zero divide inputs.
1004	//
1005	///////////////////////////////////////////////////////////////////////////////
1006
1007	assign d1stg_zero_in1= div_exp_in1_exp_eq_0
1008	&& (!div_frac_in1_53_0_neq_0) && (!div_frac_in1_54);
1009
1010	assign d1stg_zero_in2= div_exp_in2_exp_eq_0
1011	&& (!div_frac_in2_53_0_neq_0) && (!div_frac_in2_54);
1012
1013	assign d1stg_zero_in= d1stg_zero_in1 \|\| d1stg_zero_in2;
1014
1015	assign d1stg_2zero_in= d1stg_zero_in1 && d1stg_zero_in2;
1016
1017	dff_s #(1) i_d2stg_zero_in1 (
1018	.din (d1stg_zero_in1),
1019	.clk (rclk),
1020
1021	.q (d2stg_zero_in1),
1022
1023	.se (se),
1024	.si (),
1025	.so ()
1026	);
1027
1028	dff_s #(1) i_d2stg_zero_in2 (
1029	.din (d1stg_zero_in2),
1030	.clk (rclk),
1031
1032	.q (d2stg_zero_in2),
1033
1034	.se (se),
1035	.si (),
1036	.so ()
1037	);
1038
1039	dff_s #(1) i_d2stg_zero_in (
1040	.din (d1stg_zero_in),
1041	.clk (rclk),
1042
1043	.q (d2stg_zero_in),
1044
1045	.se (se),
1046	.si (),
1047	.so ()
1048	);
1049
1050	dff_s #(1) i_d2stg_2zero_in (
1051	.din (d1stg_2zero_in),
1052	.clk (rclk),
1053
1054	.q (d2stg_2zero_in),
1055
1056	.se (se),
1057	.si (),
1058	.so ()
1059	);
1060
1061
1062	///////////////////////////////////////////////////////////////////////////////
1063	//
1064	// Floating point divide control pipeline.
1065	//
1066	///////////////////////////////////////////////////////////////////////////////
1067
1068	///////////////////////////////////////////////////////////////////////////////
1069	//
1070	// Opcode pipeline- divide pipeline input.
1071	//
1072	///////////////////////////////////////////////////////////////////////////////
1073
1074	assign d1stg_hold= d1stg_div
1075	\|\| d234stg_fdiv
1076	\|\| divs_cnt_lt_23
1077	\|\| divd_cnt_lt_52;
1078
1079	assign d1stg_holda= d1stg_div
1080	\|\| d234stg_fdiv
1081	\|\| divs_cnt_lt_23a
1082	\|\| divd_cnt_lt_52a;
1083
1084	assign d1stg_step= (!d1stg_hold);
1085
1086	assign d1stg_stepa= (!d1stg_holda);
1087
1088
1089	assign d1stg_op_in[7:0]= ({8{d1stg_stepa}}
1090	& (inq_op[7:0] & {8{inq_div}}));
1091
1092	dffr_s #(8) i_d1stg_op (
1093	.din (d1stg_op_in[7:0]),
1094	.rst (reset),
1095	.clk (rclk),
1096
1097	.q (d1stg_op[7:0]),
1098
1099	.se (se),
1100	.si (),
1101	.so ()
1102	);
1103
1104	assign d1stg_div_in= inq_div && d1stg_stepa;
1105
1106	dffr_s #(1) i_d1stg_div (
1107	.din (d1stg_div_in),
1108	.rst (reset),
1109	.clk (rclk),
1110
1111	.q (d1stg_div),
1112
1113	.se (se),
1114	.si (),
1115	.so ()
1116	);
1117
1118	dffe_s #(5) i_d1stg_sngopa (
1119	.din ({5{inq_op[0]}}),
1120	.en (d1stg_stepa),
1121	.clk (rclk),
1122
1123	.q (d1stg_sngopa[4:0]),
1124
1125	.se (se),
1126	.si (),
1127	.so ()
1128	);
1129
1130	dffe_s #(1) i_d1stg_dblop (
1131	.din (inq_op[1]),
1132	.en (d1stg_stepa),
1133	.clk (rclk),
1134
1135	.q (d1stg_dblop),
1136
1137	.se (se),
1138	.si (),
1139	.so ()
1140	);
1141
1142	dffe_s #(5) i_d1stg_dblopa (
1143	.din ({5{inq_op[1]}}),
1144	.en (d1stg_stepa),
1145	.clk (rclk),
1146
1147	.q (d1stg_dblopa[4:0]),
1148
1149	.se (se),
1150	.si (),
1151	.so ()
1152	);
1153
1154
1155	///////////////////////////////////////////////////////////////////////////////
1156	//
1157	// Opcode decode- divide stage 1.
1158	//
1159	///////////////////////////////////////////////////////////////////////////////
1160
1161	assign d1stg_fdiv= (d1stg_op[7:0]==FDIVS) \|\| (d1stg_op[7:0]==FDIVD);
1162
1163	assign d1stg_fdivs= (d1stg_op[7:0]==FDIVS);
1164
1165	assign d1stg_fdivd= (d1stg_op[7:0]==FDIVD);
1166
1167	assign d1stg_opdec[2:0]= {d1stg_fdiv,
1168	d1stg_fdivs,
1169	d1stg_fdivd};
1170
1171	assign d234stg_fdiv_in= d1stg_fdiv \|\| d2stg_fdiv \|\| d3stg_fdiv;
1172
1173	dffr_s #(3) i_d2stg_opdec (
1174	.din (d1stg_opdec[2:0]),
1175	.rst (reset),
1176	.clk (rclk),
1177
1178	.q (d2stg_opdec[2:0]),
1179
1180	.se (se),
1181	.si (),
1182	.so ()
1183	);
1184
1185	dffr_s #(1) i_d234stg_fdiv (
1186	.din (d234stg_fdiv_in),
1187	.rst (reset),
1188	.clk (rclk),
1189
1190	.q (d234stg_fdiv),
1191
1192	.se (se),
1193	.si (),
1194	.so ()
1195	);
1196
1197
1198	///////////////////////////////////////////////////////////////////////////////
1199	//
1200	// Opcode pipeline- divide stage 2.
1201	//
1202	///////////////////////////////////////////////////////////////////////////////
1203
1204	assign d2stg_fdiv= d2stg_opdec[2];
1205	assign d2stg_fdivs= d2stg_opdec[1];
1206	assign d2stg_fdivd= d2stg_opdec[0];
1207
1208	dffr_s #(3) i_d3stg_opdec (
1209	.din (d2stg_opdec[2:0]),
1210	.rst (reset),
1211	.clk (rclk),
1212
1213	.q (d3stg_opdec[2:0]),
1214
1215	.se (se),
1216	.si (),
1217	.so ()
1218	);
1219
1220
1221	///////////////////////////////////////////////////////////////////////////////
1222	//
1223	// Opcode pipeline- divide stage 3.
1224	//
1225	///////////////////////////////////////////////////////////////////////////////
1226
1227	assign d3stg_fdiv= d3stg_opdec[2];
1228	//assign d3stg_fdivs= d3stg_opdec[1];
1229	//assign d3stg_fdivd= d3stg_opdec[0];
1230
1231	dffr_s #(3) i_d4stg_opdec (
1232	.din (d3stg_opdec[2:0]),
1233	.rst (reset),
1234	.clk (rclk),
1235
1236	.q (d4stg_opdec[2:0]),
1237
1238	.se (se),
1239	.si (),
1240	.so ()
1241	);
1242
1243
1244	///////////////////////////////////////////////////////////////////////////////
1245	//
1246	// Opcode pipeline- divide stage 4.
1247	//
1248	///////////////////////////////////////////////////////////////////////////////
1249
1250	assign d4stg_fdiv= d4stg_opdec[2];
1251	assign d4stg_fdivs= d4stg_opdec[1];
1252	assign d4stg_fdivd= d4stg_opdec[0];
1253
1254	assign d5stg_step= (!d5stg_fdiv) \|\| d6stg_step;
1255
1256	dffre_s #(3) i_d5stg_opdec (
1257	.din (d4stg_opdec[2:0]),
1258	.en (d5stg_step),
1259	.rst (reset),
1260	.clk (rclk),
1261
1262	.q (d5stg_opdec[2:0]),
1263
1264	.se (se),
1265	.si (),
1266	.so ()
1267	);
1268
1269	dffre_s #(1) i_d5stg_fdiva (
1270	.din (d4stg_fdiv),
1271	.en (d5stg_step),
1272	.rst (reset),
1273	.clk (rclk),
1274
1275	.q (d5stg_fdiva),
1276
1277	.se (se),
1278	.si (),
1279	.so ()
1280	);
1281
1282	assign d5stg_fdivb_in= ((d5stg_step && d4stg_fdiv)
1283	\|\| ((!d5stg_step) && d5stg_fdiv))
1284	&& (!reset);
1285
1286	dff_s #(1) i_d5stg_fdivb (
1287	.din (d5stg_fdivb_in),
1288	.clk (rclk),
1289
1290	.q (d5stg_fdivb),
1291
1292	.se (se),
1293	.si (),
1294	.so ()
1295	);
1296
1297
1298	///////////////////////////////////////////////////////////////////////////////
1299	//
1300	// Opcode pipeline- divide stage 5.
1301	//
1302	///////////////////////////////////////////////////////////////////////////////
1303
1304	assign d5stg_fdiv= d5stg_opdec[2];
1305	assign d5stg_fdivs= d5stg_opdec[1];
1306	assign d5stg_fdivd= d5stg_opdec[0];
1307
1308	assign d6stg_step= (d5stg_fdivd && (div_cnt[5:0]==6'h36))
1309	\|\| (d5stg_fdivs && (div_cnt[5:0]==6'h19))
1310	\|\| (d5stg_fdiv && ((({7'b0, div_cnt[5:0]}==div_exp1[12:0])
1311	&& (div_exp1[12:0]!=13'b0))
1312	\|\| (({7'b0, div_cnt[5:0]}==div_exp1[12:0])
1313	&& (div_exp1[12:0]==13'b0)
1314	&& d8stg_step)
1315	\|\| (div_exp1[12] && d8stg_step)));
1316
1317	assign d6stg_opdec_in[2:0]= ({3{d6stg_step}}
1318	& d5stg_opdec[2:0]);
1319
1320	dffr_s #(3) i_d6stg_opdec (
1321	.din (d6stg_opdec_in[2:0]),
1322	.rst (reset),
1323	.clk (rclk),
1324
1325	.q (d6stg_opdec[2:0]),
1326
1327	.se (se),
1328	.si (),
1329	.so ()
1330	);
1331
1332
1333	///////////////////////////////////////////////////////////////////////////////
1334	//
1335	// Opcode pipeline- divide stage 6.
1336	//
1337	///////////////////////////////////////////////////////////////////////////////
1338
1339	assign d6stg_fdiv= d6stg_opdec[2];
1340	assign d6stg_fdivs= d6stg_opdec[1];
1341	assign d6stg_fdivd= d6stg_opdec[0];
1342
1343	dffr_s #(3) i_d7stg_opdec (
1344	.din (d6stg_opdec[2:0]),
1345	.rst (reset),
1346	.clk (rclk),
1347
1348	.q (d7stg_opdec[2:0]),
1349
1350	.se (se),
1351	.si (),
1352	.so ()
1353	);
1354
1355
1356	///////////////////////////////////////////////////////////////////////////////
1357	//
1358	// Opcode pipeline- divide stage 7.
1359	//
1360	///////////////////////////////////////////////////////////////////////////////
1361
1362	assign d7stg_fdiv= d7stg_opdec[2];
1363	assign d7stg_fdivs= d7stg_opdec[1];
1364	assign d7stg_fdivd= d7stg_opdec[0];
1365
1366	assign d8stg_fdiv_in= (d8stg_step && (!reset) && d7stg_fdiv)
1367	\|\| ((!d8stg_step) && (!reset) && d8stg_fdiv);
1368
1369	dffre_s #(3) i_d8stg_opdec (
1370	.din (d7stg_opdec[2:0]),
1371	.en (d8stg_step),
1372	.rst (reset),
1373	.clk (rclk),
1374
1375	.q (d8stg_opdec[2:0]),
1376
1377	.se (se),
1378	.si (),
1379	.so ()
1380	);
1381
1382
1383	///////////////////////////////////////////////////////////////////////////////
1384	//
1385	// Opcode pipeline- divide pipeline output.
1386	//
1387	///////////////////////////////////////////////////////////////////////////////
1388
1389	assign d8stg_fdiv= d8stg_opdec[2];
1390	assign d8stg_fdivs= d8stg_opdec[1];
1391	assign d8stg_fdivd= d8stg_opdec[0];
1392
1393	assign d8stg_hold= d8stg_fdiv && (!div_dest_rdy);
1394
1395	assign d8stg_step= (!d8stg_hold);
1396
1397	// Austin update
1398	// Power management update
1399
1400	assign div_pipe_active_in = // div pipe is executing a valid instr
1401	d1stg_fdiv \|\| d2stg_fdiv \|\| d3stg_fdiv \|\| d4stg_fdiv \|
1402	d5stg_fdiv \|\| d6stg_fdiv \|\| d7stg_fdiv \|\| d8stg_fdiv ;
1403
1404	dffre_s #(1) i_div_pipe_active (
1405	.din (div_pipe_active_in),
1406	.en (1'b1),
1407	.rst (reset),
1408	.clk (rclk),
1409
1410	.q (div_pipe_active),
1411
1412	.se (se),
1413	.si (),
1414	.so ()
1415	);
1416
1417
1418	///////////////////////////////////////////////////////////////////////////////
1419	//
1420	// Divide information pipeline
1421	// - rounding mode
1422	// - ID
1423	// - sign logic
1424	// Front end of the pipeline.
1425	//
1426	///////////////////////////////////////////////////////////////////////////////
1427
1428	dffe_s #(2) i_d1stg_rnd_mode (
1429	.din (inq_rnd_mode[1:0]),
1430	.en (d1stg_stepa),
1431	.clk (rclk),
1432
1433	.q (d1stg_rnd_mode[1:0]),
1434
1435	.se (se),
1436	.si (),
1437	.so ()
1438	);
1439
1440	dffe_s #(5) i_d1stg_id (
1441	.din (inq_id[4:0]),
1442	.en (d1stg_stepa),
1443	.clk (rclk),
1444
1445	.q (d1stg_id[4:0]),
1446
1447	.se (se),
1448	.si (),
1449	.so ()
1450	);
1451
1452	dffe_s #(1) i_d1stg_sign1 (
1453	.din (inq_in1_63),
1454	.en (d1stg_stepa),
1455	.clk (rclk),
1456
1457	.q (d1stg_sign1),
1458
1459	.se (se),
1460	.si (),
1461	.so ()
1462	);
1463
1464	dffe_s #(1) i_d1stg_sign2 (
1465	.din (inq_in2_63),
1466	.en (d1stg_stepa),
1467	.clk (rclk),
1468
1469	.q (d1stg_sign2),
1470
1471	.se (se),
1472	.si (),
1473	.so ()
1474	);
1475
1476
1477	///////////////////////////////////////////////////////////////////////////////
1478	//
1479	// Divide information pipeline
1480	// - rounding mode
1481	// - ID
1482	// - sign logic
1483	// Back end of the pipeline.
1484	//
1485	///////////////////////////////////////////////////////////////////////////////
1486
1487	assign d1stg_sign= ((d1stg_sign1
1488	&& (!d2stg_snan_in2)
1489	&& (!(d2stg_qnan_in2 && (!d2stg_snan_in1))))
1490	^ (d1stg_sign2
1491	&& (!(d2stg_snan_in1 && (!d2stg_snan_in2)))
1492	&& (!(d2stg_qnan_in1 && (!d2stg_nan_in2)))))
1493	&& (!(d2stg_2inf_in \|\| d2stg_2zero_in));
1494
1495	assign div_bkend_step= (d5stg_fdiv && (div_cnt[5:0]==6'b0) && d8stg_step);
1496
1497	dffe_s #(2) i_div_rnd_mode (
1498	.din (d1stg_rnd_mode[1:0]),
1499	.en (div_bkend_step),
1500	.clk (rclk),
1501
1502	.q (div_rnd_mode[1:0]),
1503
1504	.se (se),
1505	.si (),
1506	.so ()
1507	);
1508
1509	assign div_id_out_in[9:0]= ({10{div_bkend_step}}
1510	& {(d1stg_id[4:2]==3'o7),
1511	(d1stg_id[4:2]==3'o6),
1512	(d1stg_id[4:2]==3'o5),
1513	(d1stg_id[4:2]==3'o4),
1514	(d1stg_id[4:2]==3'o3),
1515	(d1stg_id[4:2]==3'o2),
1516	(d1stg_id[4:2]==3'o1),
1517	(d1stg_id[4:2]==3'o0),
1518	d1stg_id[1:0]})
1519	\| ({10{(!div_bkend_step)}}
1520	& div_id_out[9:0]);
1521
1522	dff_s #(10) i_div_id_out (
1523	.din (div_id_out_in[9:0]),
1524	.clk (rclk),
1525
1526	.q (div_id_out[9:0]),
1527
1528	.se (se),
1529	.si (),
1530	.so ()
1531	);
1532
1533	dffe_s #(1) i_div_sign_out (
1534	.din (d1stg_sign),
1535	.en (div_bkend_step),
1536	.clk (rclk),
1537
1538	.q (div_sign_out),
1539
1540	.se (se),
1541	.si (),
1542	.so ()
1543	);
1544
1545
1546	///////////////////////////////////////////////////////////////////////////////
1547	//
1548	// Divide counter.
1549	//
1550	// Tracks the number of subtraction iterations.
1551	//
1552	///////////////////////////////////////////////////////////////////////////////
1553
1554	assign div_cnt_plus1[5:0]= (div_cnt[5:0] + 6'h01);
1555
1556	assign div_cnt_in[5:0]= ({6{(d5stg_fdiv && d8stg_step)}}
1557	& div_cnt_plus1[5:0])
1558	\| ({6{d4stg_fdiv}}
1559	& 6'b0);
1560
1561	assign div_cnt_step= (d5stg_fdiv && d8stg_step)
1562	\|\| d4stg_fdiv;
1563
1564	dffre_s #(6) i_div_cnt (
1565	.din (div_cnt_in[5:0]),
1566	.en (div_cnt_step),
1567	.rst (reset),
1568	.clk (rclk),
1569
1570	.q (div_cnt[5:0]),
1571
1572	.se (se),
1573	.si (),
1574	.so ()
1575	);
1576
1577	assign div_cnt_lt_step= (!d5stg_fdiv) \|\| d6stg_step \|\| d8stg_step;
1578
1579	assign divs_cnt_lt_23_in= d4stg_fdivs
1580	\|\| (d5stg_fdivs && (!d6stg_step) && (div_cnt_plus1[5:0]<6'h17));
1581
1582	dffre_s #(1) i_divs_cnt_lt_23 (
1583	.din (divs_cnt_lt_23_in),
1584	.en (div_cnt_lt_step),
1585	.rst (reset),
1586	.clk (rclk),
1587
1588	.q (divs_cnt_lt_23),
1589
1590	.se (se),
1591	.si (),
1592	.so ()
1593	);
1594
1595	dffre_s #(1) i_divs_cnt_lt_23a (
1596	.din (divs_cnt_lt_23_in),
1597	.en (div_cnt_lt_step),
1598	.rst (reset),
1599	.clk (rclk),
1600
1601	.q (divs_cnt_lt_23a),
1602
1603	.se (se),
1604	.si (),
1605	.so ()
1606	);
1607
1608	assign divd_cnt_lt_52_in= d4stg_fdivd
1609	\|\| (d5stg_fdivd && (!d6stg_step) && (div_cnt_plus1[5:0]<6'h34));
1610
1611	dffre_s #(1) i_divd_cnt_lt_52 (
1612	.din (divd_cnt_lt_52_in),
1613	.en (div_cnt_lt_step),
1614	.rst (reset),
1615	.clk (rclk),
1616
1617	.q (divd_cnt_lt_52),
1618
1619	.se (se),
1620	.si (),
1621	.so ()
1622	);
1623
1624	dffre_s #(1) i_divd_cnt_lt_52a (
1625	.din (divd_cnt_lt_52_in),
1626	.en (div_cnt_lt_step),
1627	.rst (reset),
1628	.clk (rclk),
1629
1630	.q (divd_cnt_lt_52a),
1631
1632	.se (se),
1633	.si (),
1634	.so ()
1635	);
1636
1637
1638	///////////////////////////////////////////////////////////////////////////////
1639	//
1640	// Divide exception logic.
1641	//
1642	///////////////////////////////////////////////////////////////////////////////
1643
1644	///////////////////////////////////////////////////////////////////////////////
1645	//
1646	// Divide overflow exception enabled.
1647	//
1648	///////////////////////////////////////////////////////////////////////////////
1649
1650	assign div_exc_step= d5stg_fdiv && (div_cnt[5:0]==6'b0) && d8stg_step;
1651
1652	assign div_of_mask_in= (!(d1stg_infnan_in \|\| d1stg_zero_in));
1653
1654	dffe_s #(1) i_div_of_mask (
1655	.din (div_of_mask_in),
1656	.en (div_exc_step),
1657	.clk (rclk),
1658
1659	.q (div_of_mask),
1660
1661	.se (se),
1662	.si (),
1663	.so ()
1664	);
1665
1666
1667	///////////////////////////////////////////////////////////////////////////////
1668	//
1669	// Divide invalid exception.
1670	//
1671	///////////////////////////////////////////////////////////////////////////////
1672
1673	assign div_nv_out_in= d1stg_snan_in1 \|\| d1stg_snan_in2 \|\| d1stg_2inf_in
1674	\|\| d1stg_2zero_in;
1675
1676	dffe_s #(1) i_div_nv_out (
1677	.din (div_nv_out_in),
1678	.en (div_exc_step),
1679	.clk (rclk),
1680
1681	.q (div_nv_out),
1682
1683	.se (se),
1684	.si (),
1685	.so ()
1686	);
1687
1688	///////////////////////////////////////////////////////////////////////////////
1689	//
1690	// Divide by zero exception.
1691	//
1692	///////////////////////////////////////////////////////////////////////////////
1693
1694	assign div_dz_out_in= d1stg_zero_in2 && (!d1stg_zero_in1)
1695	&& (!d1stg_infnan_in1);
1696
1697	dffe_s #(1) i_div_dz_out (
1698	.din (div_dz_out_in),
1699	.en (div_exc_step),
1700	.clk (rclk),
1701
1702	.q (div_dz_out),
1703
1704	.se (se),
1705	.si (),
1706	.so ()
1707	);
1708
1709
1710	///////////////////////////////////////////////////////////////////////////////
1711	//
1712	// Divide overflow exception.
1713	//
1714	///////////////////////////////////////////////////////////////////////////////
1715
1716	assign d7stg_in_of= ((!div_exp_out[12])
1717	&& d7stg_fdivd
1718	&& (div_exp_out[11] \|\| (&div_exp_out[10:0]))
1719	&& div_of_mask)
1720	\|\| ((!div_exp_out[12])
1721	&& d7stg_fdivs
1722	&& ((\|div_exp_out[11:8]) \|\| (&div_exp_out[7:0]))
1723	&& div_of_mask);
1724
1725	assign div_of_out_tmp1_in= ((!div_exp_out[12])
1726	&& d7stg_fdivd
1727	&& (&div_exp_out[10:1])
1728	&& d7stg_rndup
1729	&& div_of_mask)
1730	\|\| ((!div_exp_out[12])
1731	&& d7stg_fdivs
1732	&& (&div_exp_out[7:1])
1733	&& d7stg_rndup
1734	&& div_of_mask);
1735
1736	dffe_s #(1) i_div_of_out_tmp1 (
1737	.din (div_of_out_tmp1_in),
1738	.en (d7stg_fdiv),
1739	.clk (rclk),
1740
1741	.q (div_of_out_tmp1),
1742
1743	.se (se),
1744	.si (),
1745	.so ()
1746	);
1747
1748	dffe_s #(1) i_div_of_out_tmp2 (
1749	.din (d7stg_in_of),
1750	.en (d7stg_fdiv),
1751	.clk (rclk),
1752
1753	.q (div_of_out_tmp2),
1754
1755	.se (se),
1756	.si (),
1757	.so ()
1758	);
1759
1760	dffe_s #(1) i_div_out_52_inv (
1761	.din (div_frac_add_52_inva),
1762	.en (d7stg_fdiv),
1763	.clk (rclk),
1764
1765	.q (div_out_52_inv),
1766
1767	// Austin update
1768	// include se pin
1769	.se (se),
1770	.si (),
1771	.so ()
1772	);
1773
1774	assign div_of_out= div_of_out_tmp2
1775	\|\| (div_of_out_tmp1 && (!div_out_52_inv));
1776
1777
1778	///////////////////////////////////////////////////////////////////////////////
1779	//
1780	// Divide underflow exception.
1781	//
1782	///////////////////////////////////////////////////////////////////////////////
1783
1784	assign div_uf_out_in= ((!(\|div_exp_out[11:0]))
1785	&& (div_frac_add_in1_neq_0
1786	\|\| d7stg_grd
1787	\|\| d7stg_stk)
1788	&& div_of_mask)
1789	\|\| (div_exp_out[12]
1790	&& div_of_mask);
1791
1792	dffe_s #(1) i_div_uf_out (
1793	.din (div_uf_out_in),
1794	.en (d7stg_fdiv),
1795	.clk (rclk),
1796
1797	.q (div_uf_out),
1798
1799	.se (se),
1800	.si (),
1801	.so ()
1802	);
1803
1804
1805	///////////////////////////////////////////////////////////////////////////////
1806	//
1807	// Divide inexact exception.
1808	//
1809	///////////////////////////////////////////////////////////////////////////////
1810
1811	assign div_nx_out_in= d7stg_grd \|\| d7stg_stk;
1812
1813	dffe_s #(1) i_div_nx_out (
1814	.din (div_nx_out_in),
1815	.en (d7stg_fdiv),
1816	.clk (rclk),
1817
1818	.q (div_nx_out),
1819
1820	.se (se),
1821	.si (),
1822	.so ()
1823	);
1824
1825
1826	///////////////////////////////////////////////////////////////////////////////
1827	//
1828	// Divide exception output.
1829	//
1830	///////////////////////////////////////////////////////////////////////////////
1831
1832	// Austin update
1833	// Overflow is always accompanied by inexact.
1834	// Previously this was handled within the FFU.
1835
1836	// assign div_exc_out[4:0]= {div_nv_out, div_of_out, div_uf_out, div_dz_out,
1837	// div_nx_out};
1838
1839	assign div_exc_out[4:0] =
1840	{div_nv_out,
1841	div_of_out,
1842	div_uf_out,
1843	div_dz_out,
1844	(div_nx_out \|\| div_of_out)}; // Overflow is always accompanied by inexact
1845
1846
1847	///////////////////////////////////////////////////////////////////////////////
1848	//
1849	// Divide pipeline control logic.
1850	//
1851	///////////////////////////////////////////////////////////////////////////////
1852
1853	///////////////////////////////////////////////////////////////////////////////
1854	//
1855	// Select lines- divide normalization and special input injection.
1856	//
1857	///////////////////////////////////////////////////////////////////////////////
1858
1859	assign d1stg_spc_rslt= (d1stg_inf_in \|\| d1stg_zero_in) && (!d1stg_nan_in);
1860
1861	assign div_norm_frac_in1_dbl_norm= d1stg_fdiv && d1stg_norm_dbl_in1
1862	&& (!d1stg_snan_dbl_in2)
1863	&& ((!d1stg_qnan_dbl_in2) \|\| d1stg_snan_dbl_in1)
1864	&& (!d1stg_spc_rslt);
1865
1866	assign div_norm_frac_in1_dbl_dnrm= d1stg_fdiv && d1stg_denorm_dbl_in1
1867	&& (!d1stg_snan_dbl_in2)
1868	&& (!d1stg_qnan_dbl_in2)
1869	&& (!d1stg_spc_rslt);
1870
1871	assign div_norm_frac_in1_sng_norm= d1stg_fdiv && d1stg_norm_sng_in1
1872	&& (!d1stg_snan_sng_in2)
1873	&& ((!d1stg_qnan_sng_in2) \|\| d1stg_snan_sng_in1)
1874	&& (!d1stg_spc_rslt);
1875
1876	assign div_norm_frac_in1_sng_dnrm= d1stg_fdiv && d1stg_denorm_sng_in1
1877	&& (!d1stg_snan_sng_in2)
1878	&& (!d1stg_qnan_sng_in2)
1879	&& (!d1stg_spc_rslt);
1880
1881	assign div_norm_frac_in2_dbl_norm= (d2stg_fdiv && d2stg_norm_dbl_in2
1882	&& (!d2stg_infnan_in) && (!d2stg_zero_in))
1883	\|\| (d1stg_fdiv && d1stg_snan_dbl_in2)
1884	\|\| (d1stg_fdiv && d1stg_qnan_dbl_in2 && (!d1stg_snan_dbl_in1));
1885
1886	assign div_norm_frac_in2_dbl_dnrm= d2stg_fdiv && d2stg_denorm_dbl_in2
1887	&& (!d2stg_infnan_in) && (!d2stg_zero_in);
1888
1889	assign div_norm_frac_in2_sng_norm= (d2stg_fdiv && d2stg_norm_sng_in2
1890	&& (!d2stg_infnan_in) && (!d2stg_zero_in))
1891	\|\| (d1stg_fdiv && d1stg_snan_sng_in2)
1892	\|\| (d1stg_fdiv && d1stg_qnan_sng_in2 && (!d1stg_snan_sng_in1));
1893
1894	assign div_norm_frac_in2_sng_dnrm= d2stg_fdiv && d2stg_denorm_sng_in2
1895	&& (!d2stg_infnan_in) && (!d2stg_zero_in);
1896
1897	assign div_norm_inf= (d2stg_fdiv && (d2stg_infnan_in \|\| d2stg_zero_in))
1898	\|\| (d1stg_fdiv && ((d1stg_inf_in1 && (!d1stg_infnan_in2))
1899	\|\| (d1stg_zero_in2 && (!d1stg_infnan_in1)
1900	&& (!d1stg_zero_in1))));
1901
1902	assign div_norm_qnan= d1stg_fdiv && (d1stg_2inf_in \|\| d1stg_2zero_in);
1903
1904	assign div_norm_zero= d1stg_fdiv
1905	&& ((d1stg_inf_in2 && (!d1stg_infnan_in1))
1906	\|\| (d1stg_zero_in1 && (!d1stg_infnan_in2)
1907	&& (!d1stg_zero_in2)));
1908
1909
1910	///////////////////////////////////////////////////////////////////////////////
1911	//
1912	// Select lines- divide left shift.
1913	//
1914	///////////////////////////////////////////////////////////////////////////////
1915
1916	assign div_frac_add_in2_load= d4stg_fdiv \|\| d6stg_fdiv;
1917
1918
1919	///////////////////////////////////////////////////////////////////////////////
1920	//
1921	// Select lines- divide adder/subtractor 2nd input.
1922	//
1923	///////////////////////////////////////////////////////////////////////////////
1924
1925	assign d6stg_frac_out_shl1= (!div_frac_out_54) && (!div_exp_out[12])
1926	&& (div_exp_out[11:1]!=11'b0);
1927
1928	assign d6stg_frac_out_nosh= (!d6stg_frac_out_shl1);
1929
1930	assign div_frac_add_in1_add= d5stg_fdiv && (!div_exp1[12]) && d8stg_step;
1931
1932	assign div_frac_add_in1_load= d4stg_fdiv
1933	\|\| (d5stg_fdiv && (!div_exp1[12]) && d8stg_step)
1934	\|\| d6stg_fdiv;
1935
1936
1937	///////////////////////////////////////////////////////////////////////////////
1938	//
1939	// Divide rounding bits.
1940	//
1941	///////////////////////////////////////////////////////////////////////////////
1942
1943	assign d7stg_lsb_in= (d6stg_fdivd && d6stg_frac_2)
1944	\|\| ((!d6stg_fdivd) && d6stg_frac_31);
1945
1946	assign d7stg_grd_in= (d6stg_fdivd && d6stg_frac_1)
1947	\|\| ((!d6stg_fdivd) && d6stg_frac_30);
1948
1949	assign d7stg_stk_in= (d6stg_fdivd && d6stg_frac_0)
1950	\|\| ((!d6stg_fdivd) && d6stg_frac_29)
1951	\|\| div_frac_add_in1_neq_0;
1952
1953	dffe_s #(1) i_d7stg_lsb (
1954	.din (d7stg_lsb_in),
1955	.en (d6stg_fdiv),
1956	.clk (rclk),
1957
1958	.q (d7stg_lsb),
1959
1960	.se (se),
1961	.si (),
1962	.so ()
1963	);
1964
1965	dffe_s #(1) i_d7stg_grd (
1966	.din (d7stg_grd_in),
1967	.en (d6stg_fdiv),
1968	.clk (rclk),
1969
1970	.q (d7stg_grd),
1971
1972	.se (se),
1973	.si (),
1974	.so ()
1975	);
1976
1977	dffe_s #(1) i_d7stg_stk (
1978	.din (d7stg_stk_in),
1979	.en (d6stg_fdiv),
1980	.clk (rclk),
1981
1982	.q (d7stg_stk),
1983
1984	.se (se),
1985	.si (),
1986	.so ()
1987	);
1988
1989
1990	///////////////////////////////////////////////////////////////////////////////
1991	//
1992	// Select lines- divide adder/subtractor and fraction output register.
1993	//
1994	///////////////////////////////////////////////////////////////////////////////
1995
1996	assign d7stg_rndup= ((div_rnd_mode[1:0]==2'b10) && (!div_sign_out)
1997	&& (d7stg_grd \|\| d7stg_stk))
1998	\|\| ((div_rnd_mode[1:0]==2'b11) && div_sign_out
1999	&& (d7stg_grd \|\| d7stg_stk))
2000	\|\| ((div_rnd_mode[1:0]==2'b00)
2001	&& ((d7stg_grd && d7stg_stk)
2002	\|\| (d7stg_grd && (!d7stg_stk) && d7stg_lsb)));
2003
2004	assign d7stg_rndup_inv= (!d7stg_rndup);
2005
2006	assign d7stg_to_0= (div_rnd_mode[1:0]==2'b01)
2007	\|\| ((div_rnd_mode[1:0]==2'b10) && div_sign_out)
2008	\|\| ((div_rnd_mode[1:0]==2'b11) && (!div_sign_out));
2009
2010	assign d7stg_to_0_inv= (!d7stg_to_0);
2011
2012	assign div_frac_out_add_in1= d7stg_fdiv && (!d7stg_rndup) && (!d7stg_in_of);
2013
2014	assign div_frac_out_add= d7stg_fdiv && d7stg_rndup && (!d7stg_in_of);
2015
2016	assign div_frac_out_shl1_dbl= d5stg_fdivd && (!div_exp1[12]) && d8stg_step;
2017
2018	assign div_frac_out_shl1_sng= d5stg_fdivs && (!div_exp1[12]) && d8stg_step;
2019
2020	assign div_frac_out_of= d7stg_fdiv && d7stg_in_of;
2021
2022	assign div_frac_out_load= d4stg_fdiv
2023	\|\| d7stg_fdiv
2024	\|\| div_frac_out_shl1_dbl
2025	\|\| div_frac_out_shl1_sng;
2026
2027
2028	///////////////////////////////////////////////////////////////////////////////
2029	//
2030	// Select lines- divide exponent adder in the front end of the divide pipe.
2031	//
2032	///////////////////////////////////////////////////////////////////////////////
2033
2034	assign div_expadd1_in1_dbl_in= ((d1stg_stepa && inq_op[1])
2035	\|\| ((!d1stg_stepa) && d1stg_dblopa[4]))
2036	&& (!((d1stg_fdiv \|\| d2stg_fdiv \|\| d3stg_fdiv) && (!reset)));
2037
2038	dff_s #(1) i_div_expadd1_in1_dbl (
2039	.din (div_expadd1_in1_dbl_in),
2040	.clk (rclk),
2041
2042	.q (div_expadd1_in1_dbl),
2043
2044	.se (se),
2045	.si (),
2046	.so ()
2047	);
2048
2049	assign div_expadd1_in1_sng_in= ((d1stg_stepa && inq_op[0])
2050	\|\| ((!d1stg_stepa) && d1stg_sngopa[4]))
2051	&& (!((d1stg_fdiv \|\| d2stg_fdiv \|\| d3stg_fdiv) && (!reset)));
2052
2053	dff_s #(1) i_div_expadd1_in1_sng (
2054	.din (div_expadd1_in1_sng_in),
2055	.clk (rclk),
2056
2057	.q (div_expadd1_in1_sng),
2058
2059	.se (se),
2060	.si (),
2061	.so ()
2062	);
2063
2064	assign div_expadd1_in2_exp_in2_dbl= d2stg_fdivd;
2065
2066	assign div_expadd1_in2_exp_in2_sng= d2stg_fdivs;
2067
2068	assign div_exp1_expadd1= d1stg_fdiv
2069	\|\| (d2stg_fdiv && (!d2stg_infnan_in) && (!d2stg_zero_in))
2070	\|\| d3stg_fdiv
2071	\|\| d4stg_fdiv;
2072
2073	assign div_exp1_0835= d2stg_fdivd && d2stg_max_exp;
2074
2075	assign div_exp1_0118= d2stg_fdivs && d2stg_max_exp;
2076
2077	assign div_exp1_zero= d2stg_fdiv && d2stg_zero_exp;
2078
2079	assign d2stg_max_exp= d2stg_nan_in \|\| d2stg_inf_in1 \|\| d2stg_zero_in2;
2080
2081	assign d2stg_zero_exp= (d2stg_inf_in2 && (!d2stg_infnan_in1))
2082	\|\| (d2stg_zero_in1 && (!d2stg_infnan_in2) && (!d2stg_zero_in2));
2083
2084	assign div_exp1_load= d1stg_fdiv \|\| d2stg_fdiv \|\| d3stg_fdiv \|\| d4stg_fdiv;
2085
2086
2087	///////////////////////////////////////////////////////////////////////////////
2088	//
2089	// Select lines- divide exponent adder in the back end of the divide pipe.
2090	//
2091	///////////////////////////////////////////////////////////////////////////////
2092
2093	assign div_expadd2_in1_exp_out_in= d6stg_opdec_in[2] \|\| d6stg_fdiv;
2094
2095	dffr_s #(1) i_div_expadd2_in1_exp_out (
2096	.din (div_expadd2_in1_exp_out_in),
2097	.rst (reset),
2098	.clk (rclk),
2099
2100	.q (div_expadd2_in1_exp_out),
2101
2102	.se (se),
2103	.si (),
2104	.so ()
2105	);
2106
2107	assign div_expadd2_no_decr_inv_in= (!(div_frac_out_53
2108	\|\| (div_exp1[11:0]==(({12{(!d5stg_fdivs)}} & 12'h035)
2109	\| ({12{d5stg_fdivs}} & 12'h018)))
2110	\|\| div_expadd2_12));
2111
2112	assign div_expadd2_no_decr_load= d5stg_fdiv && d8stg_step;
2113
2114	dffe_s #(1) i_div_expadd2_no_decr_inv (
2115	.din (div_expadd2_no_decr_inv_in),
2116	.en (div_expadd2_no_decr_load),
2117	.clk (rclk),
2118
2119	.q (div_expadd2_no_decr_inv),
2120
2121	.se (se),
2122	.si (),
2123	.so ()
2124	);
2125
2126	assign div_expadd2_cin= d5stg_fdiv \|\| d7stg_fdiv;
2127
2128	assign div_exp_out_zero= d7stg_fdiv && div_exp_out[12];
2129
2130	assign div_exp_out_expadd22_inv= (!(d6stg_fdiv
2131	\|\| (d5stg_fdiv && (div_cnt[5:0]==6'b0) && d8stg_step)));
2132
2133	assign div_exp_out_expadd2= ((d7stg_fdiv && d7stg_rndup && (!d7stg_in_of))
2134	\|\| (d5stg_fdiv && (div_cnt[5:0]==6'b0) && d8stg_step)
2135	\|\| d6stg_fdiv)
2136	&& (!div_exp_out_zero);
2137
2138	assign div_exp_out_of= d7stg_fdiv && d7stg_in_of;
2139
2140	assign div_exp_out_exp_out= d7stg_fdiv
2141	&& (!d7stg_in_of)
2142	&& (!div_exp_out_zero);
2143
2144	assign div_exp_out_load= (d5stg_fdiv && (div_cnt[5:0]==6'b0) && d8stg_step)
2145	\|\| d6stg_fdiv
2146	\|\| d7stg_fdiv;
2147
2148
2149	endmodule
2150
2151

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source: XOpenSparcT1/trunk/T1-FPU/fpu_div_ctl.v @ 6

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