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Call memory_dff before DSP mapping to reserve registers (fixes #1447)

This commit is contained in:
N. Engelhardt 2019-10-17 21:33:54 +02:00
parent 0d037bf9d8
commit 3b405d985e
2 changed files with 2 additions and 0 deletions
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1
techlibs/ice40/synth_ice40.cc
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@ -273,6 +273,7 @@ struct SynthIce40Pass : public ScriptPass
run("opt_expr");
run("opt_clean");
if (help_mode || dsp) {
run("memory_dff");
run("techmap -map +/mul2dsp.v -map +/ice40/dsp_map.v -D DSP_A_MAXWIDTH=16 -D DSP_B_MAXWIDTH=16 "
"-D DSP_A_MINWIDTH=2 -D DSP_B_MINWIDTH=2 -D DSP_Y_MINWIDTH=11 "
"-D DSP_NAME=$__MUL16X16", "(if -dsp)");

1
techlibs/xilinx/synth_xilinx.cc
View File

@ -341,6 +341,7 @@ struct SynthXilinxPass : public ScriptPass
if (check_label("map_dsp", "(skip if '-nodsp')")) {
if (!nodsp || help_mode) {
run("memory_dff"); // xilinx_dsp will merge registers, reserve memory port registers first
// NB: Xilinx multipliers are signed only
run("techmap -map +/mul2dsp.v -map +/xilinx/dsp_map.v -D DSP_A_MAXWIDTH=25 "
"-D DSP_A_MAXWIDTH_PARTIAL=18 -D DSP_B_MAXWIDTH=18 " // Partial multipliers are intentionally