From 10589c57bfd0e5dd29c739e9d9db044cdb8ad8ed Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Fri, 17 Mar 2023 16:15:43 +0100
Subject: [PATCH] insert IO buffers for ECP5, off by default
---
techlibs/ecp5/synth_ecp5.cc | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/techlibs/ecp5/synth_ecp5.cc b/techlibs/ecp5/synth_ecp5.cc
index f2dc534f9..82e234868 100644
--- a/techlibs/ecp5/synth_ecp5.cc
+++ b/techlibs/ecp5/synth_ecp5.cc
@@ -100,6 +100,9 @@ struct SynthEcp5Pass : public ScriptPass
log(" generate an output netlist (and BLIF file) suitable for VPR\n");
log(" (this feature is experimental and incomplete)\n");
log("\n");
+ log(" -iopad\n");
+ log(" insert IO buffers\n");
+ log("\n");
log(" -nodsp\n");
log(" do not map multipliers to MULT18X18D\n");
log("\n");
@@ -115,7 +118,7 @@ struct SynthEcp5Pass : public ScriptPass
}
string top_opt, blif_file, edif_file, json_file;
- bool noccu2, nodffe, nobram, nolutram, nowidelut, asyncprld, flatten, dff, retime, abc2, abc9, nodsp, vpr, no_rw_check;
+ bool noccu2, nodffe, nobram, nolutram, nowidelut, asyncprld, flatten, dff, retime, abc2, abc9, iopad, nodsp, vpr, no_rw_check;
void clear_flags() override
{
@@ -135,6 +138,7 @@ struct SynthEcp5Pass : public ScriptPass
abc2 = false;
vpr = false;
abc9 = false;
+ iopad = false;
nodsp = false;
no_rw_check = false;
}
@@ -223,6 +227,10 @@ struct SynthEcp5Pass : public ScriptPass
abc9 = true;
continue;
}
+ if (args[argidx] == "-iopad") {
+ iopad = true;
+ continue;
+ }
if (args[argidx] == "-nodsp") {
nodsp = true;
continue;
@@ -319,6 +327,11 @@ struct SynthEcp5Pass : public ScriptPass
run("techmap");
else
run("techmap -map +/techmap.v -map +/ecp5/arith_map.v");
+ if (help_mode || iopad) {
+ run("iopadmap -bits -outpad OB I:O -inpad IB O:I -toutpad OBZ ~T:I:O -tinoutpad BB ~T:O:I:B A:top", "(only if '-iopad')");
+ run("attrmvcp -attr src -attr LOC t:OB %x:+[O] t:OBZ %x:+[O] t:BB %x:+[B]");
+ run("attrmvcp -attr src -attr LOC -driven t:IB %x:+[I]");
+ }
run("opt -fast");
if (retime || help_mode)
run("abc -dff -D 1", "(only if -retime)");