ecp5: Adding BRAM initialisation and config

Signed-off-by: David Shah <dave@ds0.me>

5 files changed, 73 insertions, 0 deletions

diff --git a/techlibs/ecp5/.gitignore b/techlibs/ecp5/.gitignore
new file mode 100644
index 000000000..84d260810
--- /dev/null
+++ b/techlibs/ecp5/.gitignore
@@ -0,0 +1,3 @@
+bram_init_1_2_4.vh
+bram_init_9_18_36.vh
+brams_init.mk
diff --git a/techlibs/ecp5/Makefile.inc b/techlibs/ecp5/Makefile.inc
index 9d3247347..95d40fccf 100644
--- a/techlibs/ecp5/Makefile.inc
+++ b/techlibs/ecp5/Makefile.inc
@@ -5,4 +5,19 @@ $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/cells_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/cells_sim.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/drams_map.v))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/dram.txt))
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/bram.txt))
 $(eval $(call add_share_file,share/ecp5,techlibs/ecp5/arith_map.v))
+
+EXTRA_OBJS += techlibs/ecp5/brams_init.mk
+.SECONDARY: techlibs/ecp5/brams_init.mk
+
+techlibs/ecp5/brams_init.mk: techlibs/ecp5/brams_init.py
+	$(Q) mkdir -p techlibs/ecp5
+	$(P) python3 $<
+	$(Q) touch $@
+
+techlibs/ecp5/bram_init_1_2_4.vh: techlibs/ecp5/brams_init.mk
+techlibs/ecp5/bram_init_9_18_36.vh: techlibs/ecp5/brams_init.mk
+
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/bram_init_1_2_4.vh))
+$(eval $(call add_share_file,share/ecp5,techlibs/ecp5/bram_init_9_18_36.vh))
diff --git a/techlibs/ecp5/bram.txt b/techlibs/ecp5/bram.txt
new file mode 100644
index 000000000..9d22e4afe
--- /dev/null
+++ b/techlibs/ecp5/bram.txt
@@ -0,0 +1,29 @@
+bram $__ECP5_DP16KD
+  init 1
+
+  abits 10 @a10d18
+  dbits 18 @a10d18
+  abits 11 @a11d9
+  dbits 9  @a11d9
+  abits 12 @a12d4
+  dbits 4  @a12d4
+  abits 13 @a13d2
+  dbits 2  @a13d2
+  abits 14 @a14d1
+  dbits 1  @a14d1
+
+  groups 2
+  ports 1 1
+  wrmode 1 0
+  enable 2 1 @a10d18
+  enable 1 1 @a11d9 @a12d4 @a13d2 @a14d1
+  transp 0 2
+  clocks 1 2
+  clkpol 2 2
+endbram
+
+match $__ECP5_DP16KD
+  min bits 2048
+  min efficiency 5
+  shuffle_enable B
+endmatch
diff --git a/techlibs/ecp5/brams_init.py b/techlibs/ecp5/brams_init.py
new file mode 100755
index 000000000..6f650b2a9
--- /dev/null
+++ b/techlibs/ecp5/brams_init.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+with open("techlibs/ecp5/bram_init_1_2_4.vh", "w") as f:
+    for i in range(0, 0x40):
+        init_snippets = []
+        for j in range(32):
+            init_snippets.append("INIT[%4d*8 +: 8]" % (32 * i + j))
+            init_snippets.append("3'b000" if (j % 2 == 1) else "1'b0")
+        init_snippets = list(reversed(init_snippets))
+        for k in range(8, 64, 8):
+            init_snippets[k] = "\n          " + init_snippets[k]
+        print(".INIT_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
+
+with open("techlibs/ecp5/bram_init_9_18_36.vh", "w") as f:
+    for i in range(0, 0x40):
+        init_snippets = []
+        for j in range(16):
+            init_snippets.append("INIT[%3d*18 +: 18]" % (16 * i + j))
+            init_snippets.append("2'b00")
+        init_snippets = list(reversed(init_snippets))
+        for k in range(8, 32, 8):
+            init_snippets[k] = "\n          " + init_snippets[k]
+        print(".INIT_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
diff --git a/techlibs/ecp5/cells_sim.v b/techlibs/ecp5/cells_sim.v
index c89fde1b1..3e7e83aac 100644
--- a/techlibs/ecp5/cells_sim.v
+++ b/techlibs/ecp5/cells_sim.v
@@ -472,6 +472,10 @@ module DP16KD(
   parameter CSDECODE_A = "0b000";
   parameter CSDECODE_B = "0b000";
 
+  parameter WRITEMODE_A = "NORMAL";
+  parameter WRITEMODE_B = "NORMAL";
+
+
   parameter GSR = "ENABLED";
 
   parameter INITVAL_00 = "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000";