From d53a2bd1d3ae3cfbc9ead0fc12999fe269628179 Mon Sep 17 00:00:00 2001
From: Icenowy Zheng <icenowy@aosc.io>
Date: Fri, 14 Dec 2018 16:50:37 +0800
Subject: anlogic: add support for Eagle Distributed RAM

The MSLICEs on the Eagle series of FPGA can be configured as Distributed
RAM.

Enable to synthesis to DRAM.

As the Anlogic software suite doesn't support any 'bx to exist in the
initializtion data of DRAM, do not enable the initialization support of
the inferred DRAM.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 techlibs/anlogic/Makefile.inc     |  3 ++-
 techlibs/anlogic/drams.txt        | 16 ++++++++++++++++
 techlibs/anlogic/drams_map.v      | 19 +++++++++++++++++++
 techlibs/anlogic/synth_anlogic.cc |  6 ++++++
 4 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 techlibs/anlogic/drams.txt
 create mode 100644 techlibs/anlogic/drams_map.v

(limited to 'techlibs/anlogic')

diff --git a/techlibs/anlogic/Makefile.inc b/techlibs/anlogic/Makefile.inc
index 750dced31..59be83fd0 100644
--- a/techlibs/anlogic/Makefile.inc
+++ b/techlibs/anlogic/Makefile.inc
@@ -5,4 +5,5 @@ OBJS += techlibs/anlogic/anlogic_eqn.o
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/arith_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_sim.v))
-$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/eagle_bb.v))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/drams.txt))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/drams_map.v))
diff --git a/techlibs/anlogic/drams.txt b/techlibs/anlogic/drams.txt
new file mode 100644
index 000000000..2bff14a03
--- /dev/null
+++ b/techlibs/anlogic/drams.txt
@@ -0,0 +1,16 @@
+bram $__ANLOGIC_DRAM16X4
+  init 0
+  abits 4
+  dbits 2
+  groups 2
+  ports  1 1
+  wrmode 0 1
+  enable 0 1
+  transp 0 0
+  clocks 0 1
+  clkpol 0 1
+endbram
+
+match $__ANLOGIC_DRAM16X4
+  make_outreg
+endmatch
diff --git a/techlibs/anlogic/drams_map.v b/techlibs/anlogic/drams_map.v
new file mode 100644
index 000000000..87cbb6a45
--- /dev/null
+++ b/techlibs/anlogic/drams_map.v
@@ -0,0 +1,19 @@
+module \$__ANLOGIC_DRAM16X4 (CLK1, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
+	input CLK1;
+
+	input [3:0] A1ADDR;
+	output [3:0] A1DATA;
+
+	input [3:0] B1ADDR;
+	input [3:0] B1DATA;
+	input B1EN;
+
+	EG_LOGIC_DRAM16X4 _TECHMAP_REPLACE_ (
+		.di(B1DATA),
+		.waddr(B1ADDR),
+		.wclk(CLK1),
+		.we(B1EN),
+		.raddr(A1ADDR),
+		.do(A1DATA)
+	);
+endmodule
diff --git a/techlibs/anlogic/synth_anlogic.cc b/techlibs/anlogic/synth_anlogic.cc
index f4ef88770..a4eafeddf 100644
--- a/techlibs/anlogic/synth_anlogic.cc
+++ b/techlibs/anlogic/synth_anlogic.cc
@@ -150,6 +150,12 @@ struct SynthAnlogicPass : public ScriptPass
 			run("synth -run coarse");
 		}
 
+		if (check_label("dram"))
+		{
+			run("memory_bram -rules +/anlogic/drams.txt");
+			run("techmap -map +/anlogic/drams_map.v");
+		}
+
 		if (check_label("fine"))
 		{
 			run("opt -fast -mux_undef -undriven -fine");
-- 
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