2 * yosys -- Yosys Open SYnthesis Suite
4 * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include "kernel/register.h"
21 #include "kernel/celltypes.h"
22 #include "kernel/rtlil.h"
23 #include "kernel/log.h"
26 PRIVATE_NAMESPACE_BEGIN
28 #define XC7_WIRE_DELAY "300" // Number with which ABC will map a 6-input gate
29 // to one LUT6 (instead of a LUT5 + LUT2)
31 struct SynthXilinxPass
: public ScriptPass
33 SynthXilinxPass() : ScriptPass("synth_xilinx", "synthesis for Xilinx FPGAs") { }
35 void help() YS_OVERRIDE
37 // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
39 log(" synth_xilinx [options]\n");
41 log("This command runs synthesis for Xilinx FPGAs. This command does not operate on\n");
42 log("partly selected designs. At the moment this command creates netlists that are\n");
43 log("compatible with 7-Series Xilinx devices.\n");
45 log(" -top <module>\n");
46 log(" use the specified module as top module\n");
48 log(" -family {xcup|xcu|xc7|xc6s}\n");
49 log(" run synthesis for the specified Xilinx architecture\n");
50 log(" generate the synthesis netlist for the specified family.\n");
51 log(" default: xc7\n");
53 log(" -edif <file>\n");
54 log(" write the design to the specified edif file. writing of an output file\n");
55 log(" is omitted if this parameter is not specified.\n");
57 log(" -blif <file>\n");
58 log(" write the design to the specified BLIF file. writing of an output file\n");
59 log(" is omitted if this parameter is not specified.\n");
62 log(" generate an output netlist (and BLIF file) suitable for VPR\n");
63 log(" (this feature is experimental and incomplete)\n");
66 log(" disable inference of block rams\n");
69 log(" disable inference of distributed rams\n");
72 log(" disable inference of shift registers\n");
75 log(" do not use XORCY/MUXCY/CARRY4 cells in output netlist\n");
78 log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\n");
80 log(" -run <from_label>:<to_label>\n");
81 log(" only run the commands between the labels (see below). an empty\n");
82 log(" from label is synonymous to 'begin', and empty to label is\n");
83 log(" synonymous to the end of the command list.\n");
86 log(" flatten design before synthesis\n");
89 log(" run 'abc' with -dff option\n");
92 log(" use new ABC9 flow (EXPERIMENTAL)\n");
95 log("The following commands are executed by this synthesis command:\n");
100 std::string top_opt
, edif_file
, blif_file
, family
;
101 bool flatten
, retime
, vpr
, nobram
, nodram
, nosrl
, nocarry
, nowidelut
, abc9
;
103 void clear_flags() YS_OVERRIDE
105 top_opt
= "-auto-top";
121 void execute(std::vector
<std::string
> args
, RTLIL::Design
*design
) YS_OVERRIDE
123 std::string run_from
, run_to
;
127 for (argidx
= 1; argidx
< args
.size(); argidx
++)
129 if (args
[argidx
] == "-top" && argidx
+1 < args
.size()) {
130 top_opt
= "-top " + args
[++argidx
];
133 if ((args
[argidx
] == "-family" || args
[argidx
] == "-arch") && argidx
+1 < args
.size()) {
134 family
= args
[++argidx
];
137 if (args
[argidx
] == "-edif" && argidx
+1 < args
.size()) {
138 edif_file
= args
[++argidx
];
141 if (args
[argidx
] == "-blif" && argidx
+1 < args
.size()) {
142 blif_file
= args
[++argidx
];
145 if (args
[argidx
] == "-run" && argidx
+1 < args
.size()) {
146 size_t pos
= args
[argidx
+1].find(':');
147 if (pos
== std::string::npos
)
149 run_from
= args
[++argidx
].substr(0, pos
);
150 run_to
= args
[argidx
].substr(pos
+1);
153 if (args
[argidx
] == "-flatten") {
157 if (args
[argidx
] == "-retime") {
161 if (args
[argidx
] == "-nocarry") {
165 if (args
[argidx
] == "-nowidelut") {
169 if (args
[argidx
] == "-vpr") {
173 if (args
[argidx
] == "-nocarry") {
177 if (args
[argidx
] == "-nobram") {
181 if (args
[argidx
] == "-nodram") {
185 if (args
[argidx
] == "-nosrl") {
189 if (args
[argidx
] == "-abc9") {
195 extra_args(args
, argidx
, design
);
197 if (family
!= "xcup" && family
!= "xcu" && family
!= "xc7" && family
!= "xc6s")
198 log_cmd_error("Invalid Xilinx -family setting: %s\n", family
.c_str());
200 if (!design
->full_selection())
201 log_cmd_error("This command only operates on fully selected designs!\n");
203 log_header(design
, "Executing SYNTH_XILINX pass.\n");
206 run_script(design
, run_from
, run_to
);
211 void script() YS_OVERRIDE
213 if (check_label("begin")) {
215 run("read_verilog -lib -D _ABC -D_EXPLICIT_CARRY +/xilinx/cells_sim.v");
217 run("read_verilog -lib -D _ABC +/xilinx/cells_sim.v");
219 run("read_verilog -lib +/xilinx/cells_xtra.v");
221 if (!nobram
|| help_mode
)
222 run("read_verilog -lib +/xilinx/brams_bb.v", "(skip if '-nobram')");
224 run(stringf("hierarchy -check %s", top_opt
.c_str()));
227 if (check_label("flatten", "(with '-flatten' only)")) {
228 if (flatten
|| help_mode
) {
234 if (check_label("coarse")) {
235 run("synth -run coarse");
237 // shregmap -tech xilinx can cope with $shiftx and $mux
238 // cells for identifying variable-length shift registers,
239 // so attempt to convert $pmux-es to the former
240 if (!nosrl
|| help_mode
)
241 run("pmux2shiftx", "(skip if '-nosrl')");
243 // Run a number of peephole optimisations, including one
244 // that optimises $mul cells driving $shiftx's B input
245 // and that aids wide mux analysis
249 if (check_label("bram", "(skip if '-nobram')")) {
250 if (!nobram
|| help_mode
) {
251 run("memory_bram -rules +/xilinx/brams.txt");
252 run("techmap -map +/xilinx/brams_map.v");
256 if (check_label("dram", "(skip if '-nodram')")) {
257 if (!nodram
|| help_mode
) {
258 run("memory_bram -rules +/xilinx/drams.txt");
259 run("techmap -map +/xilinx/drams_map.v");
263 if (check_label("fine")) {
264 run("opt -fast -full");
270 if (!nosrl
|| help_mode
) {
271 // shregmap operates on bit-level flops, not word-level,
272 // so break those down here
273 run("simplemap t:$dff t:$dffe", "(skip if '-nosrl')");
274 // shregmap with '-tech xilinx' infers variable length shift regs
275 run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')");
278 std::string techmap_files
= " -map +/techmap.v";
280 techmap_files
+= " [-map +/xilinx/arith_map.v]";
282 techmap_files
+= " -map +/xilinx/arith_map.v";
284 techmap_files
+= " -D _EXPLICIT_CARRY";
286 techmap_files
+= " -D _CLB_CARRY";
288 run("techmap " + techmap_files
);
292 if (check_label("map_cells")) {
293 run("techmap -map +/techmap.v -map +/xilinx/cells_map.v");
297 if (check_label("map_luts")) {
298 run("opt_expr -mux_undef");
300 run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(skip if 'nowidelut', only for '-retime')");
303 log_warning("'synth_xilinx -abc9' currently supports '-family xc7' only.\n");
305 run("abc9 -lut +/xilinx/abc_xc7_nowide.lut -box +/xilinx/abc_xc7.box -W " + std::string(XC7_WIRE_DELAY
) + string(retime
? " -dff" : ""));
307 run("abc9 -lut +/xilinx/abc_xc7.lut -box +/xilinx/abc_xc7.box -W " + std::string(XC7_WIRE_DELAY
) + string(retime
? " -dff" : ""));
311 run("abc -luts 2:2,3,6:5" + string(retime
? " -dff" : ""));
313 run("abc -luts 2:2,3,6:5,10,20" + string(retime
? " -dff" : ""));
317 // This shregmap call infers fixed length shift registers after abc
318 // has performed any necessary retiming
319 if (!nosrl
|| help_mode
)
320 run("shregmap -minlen 3 -init -params -enpol any_or_none", "(skip if '-nosrl')");
321 run("techmap -map +/xilinx/lut_map.v -map +/xilinx/ff_map.v -map +/xilinx/cells_map.v");
322 run("dffinit -ff FDRE Q INIT -ff FDCE Q INIT -ff FDPE Q INIT -ff FDSE Q INIT "
323 "-ff FDRE_1 Q INIT -ff FDCE_1 Q INIT -ff FDPE_1 Q INIT -ff FDSE_1 Q INIT");
327 if (check_label("check")) {
328 run("hierarchy -check");
329 run("stat -tech xilinx");
330 run("check -noinit");
333 if (check_label("edif")) {
334 if (!edif_file
.empty() || help_mode
)
335 run(stringf("write_edif -pvector bra %s", edif_file
.c_str()));
338 if (check_label("blif")) {
339 if (!blif_file
.empty() || help_mode
)
340 run(stringf("write_blif %s", edif_file
.c_str()));
345 PRIVATE_NAMESPACE_END