From 903f9973913371452005eb173ac50fec1d5d1447 Mon Sep 17 00:00:00 2001 From: Pepijn de Vos Date: Mon, 28 Oct 2019 15:18:01 +0100 Subject: add tristate buffer and test --- techlibs/gowin/cells_sim.v | 6 ++++++ techlibs/gowin/synth_gowin.cc | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) (limited to 'techlibs/gowin') diff --git a/techlibs/gowin/cells_sim.v b/techlibs/gowin/cells_sim.v index 0fe2c8c52..cc1ac48e6 100644 --- a/techlibs/gowin/cells_sim.v +++ b/techlibs/gowin/cells_sim.v @@ -302,6 +302,12 @@ module OBUF(output O, input I); assign O = I; endmodule +module TBUF (O, I, OEN); + input I, OEN; + output O; + assign O = OEN ? I : 1'bz; +endmodule + module GSR (input GSRI); wire GSRO = GSRI; endmodule diff --git a/techlibs/gowin/synth_gowin.cc b/techlibs/gowin/synth_gowin.cc index e9b2ccded..d541edd84 100644 --- a/techlibs/gowin/synth_gowin.cc +++ b/techlibs/gowin/synth_gowin.cc @@ -174,7 +174,7 @@ struct SynthGowinPass : public ScriptPass run("synth -run coarse"); } - if (!nobram && check_label("bram", "(skip if -nobram)")) + if (!nobram && check_label("bram", "(skip if -nobram)")) { run("memory_bram -rules +/gowin/bram.txt"); run("techmap -map +/gowin/brams_map.v -map +/gowin/cells_sim.v"); @@ -230,7 +230,7 @@ struct SynthGowinPass : public ScriptPass run("techmap -map +/gowin/cells_map.v"); run("setundef -undriven -params -zero"); run("hilomap -singleton -hicell VCC V -locell GND G"); - run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O", "(unless -noiopads)"); + run("iopadmap -bits -inpad IBUF O:I -outpad OBUF I:O, -toutpad TBUF OEN:I:O", "(unless -noiopads)"); run("dffinit -ff DFF Q INIT"); run("clean"); -- cgit v1.2.3