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xc7: Map combinational DSP48E1s

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-07-08 19:15:25 +01:00
parent e78864993a
commit c865559f95
4 changed files with 77 additions and 7 deletions
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39
techlibs/xilinx/synth_xilinx.cc
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@ -77,6 +77,9 @@ struct SynthXilinxPass : public ScriptPass
log(" -nowidelut\n");
log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\n");
log("\n");
log(" -nodsp\n");
log(" do not use DSP48E1s to implement multipliers and associated logic\n");
log("\n");
log(" -widemux <int>\n");
log(" enable inference of hard multiplexer resources (MuxFx) for muxes at or\n");
log(" above this number of inputs (minimum value 5).\n");
@ -103,7 +106,7 @@ struct SynthXilinxPass : public ScriptPass
}
std::string top_opt, edif_file, blif_file, family;
bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, abc9;
bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, nodsp, abc9;
int widemux;
void clear_flags() YS_OVERRIDE
@ -121,6 +124,7 @@ struct SynthXilinxPass : public ScriptPass
nosrl = false;
nocarry = false;
nowidelut = false;
nodsp = false;
abc9 = false;
widemux = 0;
}
@ -201,6 +205,10 @@ struct SynthXilinxPass : public ScriptPass
abc9 = true;
continue;
}
if (args[argidx] == "-nodsp") {
nodsp = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -239,10 +247,31 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("coarse")) {
if (help_mode)
run("synth -run coarse [-flatten]", "(with '-flatten')");
else
run("synth -run coarse" + std::string(flatten ? "" : " -flatten"), "(with '-flatten')");
run("proc");
if (flatten || help_mode)
run("flatten", "(with '-flatten')");
run("opt_expr");
run("opt_clean");
run("check");
run("opt");
run("wreduce");
run("peepopt");
run("opt_clean");
run("share");
run("techmap -map +/cmp2lut.v -D LUT_WIDTH=4");
run("opt_expr");
run("opt_clean");
if (!nodsp || help_mode) {
run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=25 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL25X18");
run("clean");
run("techmap -map +/xilinx/dsp_map.v");
}
run("alumacc");
run("opt");
run("fsm");
run("opt -fast");
run("memory -nomap");
run("opt_clean");
if (widemux > 0 || help_mode)
run("muxpack", " ('-widemux' only)");