From 3b405d985e789ecf0082f724d2d62d3752e4b60c Mon Sep 17 00:00:00 2001 From: "N. Engelhardt" Date: Thu, 17 Oct 2019 21:33:54 +0200 Subject: Call memory_dff before DSP mapping to reserve registers (fixes #1447) --- techlibs/xilinx/synth_xilinx.cc | 1 + 1 file changed, 1 insertion(+) (limited to 'techlibs/xilinx') diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index f13740865..6f8254b59 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -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 -- cgit v1.2.3