[prim,rtl] Fix RW collision bug in prim_1p_ram_scr
When a read collides with buffered write data only the bits that have
been written by a partial write should be forwarded. Otherwise the read
data should come directly from the memory as normal.
Previously prim_ram_1p_scr would forward bits from the buffered write
data if they had been written and otherwise just produce 0 for read
bits that weren't part of a buffered partial write.
Signed-off-by: Greg Chadwick <gac@lowrisc.org>
diff --git a/hw/ip/prim/rtl/prim_ram_1p_scr.sv b/hw/ip/prim/rtl/prim_ram_1p_scr.sv
index 0a30c9b..3065581 100644
--- a/hw/ip/prim/rtl/prim_ram_1p_scr.sv
+++ b/hw/ip/prim/rtl/prim_ram_1p_scr.sv
@@ -320,6 +320,8 @@
for (int k = 0; k < Width; k++) begin
if (wmask_q[k]) begin
rdata_o[k] = wdata_q[k];
+ end else begin
+ rdata_o[k] = rdata[k];
end
end
// regular reads. note that we just return zero in case
