From: Andrew Zonenberg <azonenberg@drawersteak.com>
Date: Sat, 10 Dec 2016 10:46:36 +0000 (+0800)
Subject: greenpak4: Can now techmap inferred D latches (without set/reset or output inverter)
X-Git-Tag: yosys-0.8~553^2^2~20
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c53a33143efc0ba2ee38fdb9f2ab8a4f16bde4b8;p=yosys.git

greenpak4: Can now techmap inferred D latches (without set/reset or output inverter)
---

diff --git a/techlibs/greenpak4/Makefile.inc b/techlibs/greenpak4/Makefile.inc
index 1c9871e2f..7482af6c6 100644
--- a/techlibs/greenpak4/Makefile.inc
+++ b/techlibs/greenpak4/Makefile.inc
@@ -3,6 +3,7 @@ OBJS += techlibs/greenpak4/synth_greenpak4.o
 OBJS += techlibs/greenpak4/greenpak4_counters.o
 OBJS += techlibs/greenpak4/greenpak4_dffinv.o
 
+$(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_latch.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_map.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/cells_sim.v))
 $(eval $(call add_share_file,share/greenpak4,techlibs/greenpak4/gp_dff.lib))
diff --git a/techlibs/greenpak4/cells_latch.v b/techlibs/greenpak4/cells_latch.v
new file mode 100644
index 000000000..2ccdd2031
--- /dev/null
+++ b/techlibs/greenpak4/cells_latch.v
@@ -0,0 +1,15 @@
+module $_DLATCH_P_(input E, input D, output Q);
+	GP_DLATCH _TECHMAP_REPLACE_ (
+		.D(D),
+		.nCLK(!E),
+		.Q(Q)
+		);
+endmodule
+
+module $_DLATCH_N_(input E, input D, output Q);
+	GP_DLATCH _TECHMAP_REPLACE_ (
+		.D(D),
+		.nCLK(E),
+		.Q(Q)
+		);
+endmodule
diff --git a/techlibs/greenpak4/synth_greenpak4.cc b/techlibs/greenpak4/synth_greenpak4.cc
index dac256822..be12ab495 100644
--- a/techlibs/greenpak4/synth_greenpak4.cc
+++ b/techlibs/greenpak4/synth_greenpak4.cc
@@ -161,6 +161,7 @@ struct SynthGreenPAK4Pass : public ScriptPass
 			run("memory_map");
 			run("opt -undriven -fine");
 			run("techmap");
+			run("techmap -map +/greenpak4/cells_latch.v");
 			run("dfflibmap -prepare -liberty +/greenpak4/gp_dff.lib");
 			run("opt -fast");
 			if (retime || help_mode)