diff options
Diffstat (limited to 'techlibs/nexus/synth_nexus.cc')
| -rw-r--r-- | techlibs/nexus/synth_nexus.cc | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/techlibs/nexus/synth_nexus.cc b/techlibs/nexus/synth_nexus.cc index 7e2185ab6..7f36eb282 100644 --- a/techlibs/nexus/synth_nexus.cc +++ b/techlibs/nexus/synth_nexus.cc @@ -77,6 +77,11 @@ struct SynthNexusPass : public ScriptPass log(" -nodffe\n"); log(" do not use flipflops with CE in output netlist\n"); log("\n"); + log(" -nolram\n"); + log(" do not use large RAM cells in output netlist\n"); + log(" note that large RAM must be explicitly requested with a (* lram *)\n"); + log(" attribute on the memory.\n"); + log("\n"); log(" -nobram\n"); log(" do not use block RAM cells in output netlist\n"); log("\n"); @@ -89,6 +94,9 @@ struct SynthNexusPass : public ScriptPass log(" -noiopad\n"); log(" do not insert IO buffers\n"); log("\n"); + log(" -nodsp\n"); + log(" do not infer DSP multipliers\n"); + log("\n"); log(" -abc9\n"); log(" use new ABC9 flow (EXPERIMENTAL)\n"); log("\n"); @@ -98,7 +106,7 @@ struct SynthNexusPass : public ScriptPass } string top_opt, json_file, vm_file, family; - bool noccu2, nodffe, nobram, nolutram, nowidelut, noiopad, flatten, dff, retime, abc9; + bool noccu2, nodffe, nolram, nobram, nolutram, nowidelut, noiopad, nodsp, flatten, dff, retime, abc9; void clear_flags() override { @@ -108,10 +116,12 @@ struct SynthNexusPass : public ScriptPass vm_file = ""; noccu2 = false; nodffe = false; + nolram = false; nobram = false; nolutram = false; nowidelut = false; noiopad = false; + nodsp = false; flatten = true; dff = false; retime = false; @@ -161,6 +171,10 @@ struct SynthNexusPass : public ScriptPass dff = true; continue; } + if (args[argidx] == "-nodsp") { + nodsp = true; + continue; + } if (args[argidx] == "-retime") { retime = true; continue; @@ -173,6 +187,10 @@ struct SynthNexusPass : public ScriptPass nodffe = true; continue; } + if (args[argidx] == "-nolram") { + nolram = true; + continue; + } if (args[argidx] == "-nobram") { nobram = true; continue; @@ -211,6 +229,22 @@ struct SynthNexusPass : public ScriptPass log_pop(); } + struct DSPRule { + int a_maxwidth; + int b_maxwidth; + int a_minwidth; + int b_minwidth; + std::string prim; + }; + + const std::vector<DSPRule> dsp_rules = { + {36, 36, 22, 22, "$__NX_MUL36X36"}, + {36, 18, 22, 10, "$__NX_MUL36X18"}, + {18, 18, 10, 4, "$__NX_MUL18X18"}, + {18, 18, 4, 10, "$__NX_MUL18X18"}, + { 9, 9, 4, 4, "$__NX_MUL9X9"}, + }; + void script() override { @@ -244,12 +278,31 @@ struct SynthNexusPass : public ScriptPass run("opt_expr"); run("opt_clean"); + if (help_mode) { + run("techmap -map +/mul2dsp.v [...]", "(unless -nodsp)"); + run("techmap -map +/nexus/dsp_map.v", "(unless -nodsp)"); + } else if (!nodsp) { + for (const auto &rule : dsp_rules) { + run(stringf("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=%d -D DSP_B_MAXWIDTH=%d -D DSP_A_MINWIDTH=%d -D DSP_B_MINWIDTH=%d -D DSP_NAME=%s", + rule.a_maxwidth, rule.b_maxwidth, rule.a_minwidth, rule.b_minwidth, rule.prim.c_str())); + run("chtype -set $mul t:$__soft_mul"); + } + run("techmap -map +/nexus/dsp_map.v"); + } + run("alumacc"); run("opt"); run("memory -nomap"); run("opt_clean"); } + if (!nolram && check_label("map_lram", "(skip if -nolram)")) + { + run("memory_bram -rules +/nexus/lrams.txt"); + run("setundef -zero -params t:$__NX_PDPSC512K"); + run("techmap -map +/nexus/lrams_map.v"); + } + if (!nobram && check_label("map_bram", "(skip if -nobram)")) { run("memory_bram -rules +/nexus/brams.txt"); |