bram: TDP minitest

Signed-off-by: John McMaster <johndmcmaster@gmail.com>

minitests/bram_basic/Makefile

@@ -44,4 +44,6 @@ build/roi_bram18_width.diff:
 build/roi_bram18_write_mode.diff:
 	$(MAKE) -f diff.mk OUT_DIFF=build/roi_bram18_write_mode.diff PRJL=roi_bram18_write_mode_a PRJR=roi_bram18_write_mode_b
 
+build/roi_bram18_ram_mode.diff:
+	$(MAKE) -f diff.mk OUT_DIFF=build/roi_bram18_ram_mode.diff PRJL=roi_bram18_ram_mode_tdp PRJR=roi_bram18_ram_mode_sdp
 

minitests/bram_basic/runme.tcl

@@ -25,5 +25,7 @@ route_design
 write_checkpoint -force design.dcp
 
 # set_property BITSTREAM.GENERAL.DEBUGBITSTREAM Yes [current_design]
+# BRAM SDP WEA check, to make test slightly easier to write
+set_property IS_ENABLED 0 [get_drc_checks {REQP-1931}]
 write_bitstream -force design.bit
 

minitests/bram_basic/top.v

@@ -266,7 +266,7 @@ module roi_hck(input clk, input [255:0] din, output [255:0] dout);
 endmodule
 
 /******************************************************************************
-Misc ROI
+READ_WIDTH
 ******************************************************************************/
 
 module roi_bram18_width_a(input clk, input [255:0] din, output [255:0] dout);
@@ -281,6 +281,9 @@ module roi_bram18_width_b(input clk, input [255:0] din, output [255:0] dout);
 endmodule
 
 
+/******************************************************************************
+WRITE_MODE
+******************************************************************************/
 
 module roi_bram18_write_mode_a(input clk, input [255:0] din, output [255:0] dout);
     ram_RAMB18E1 #(.LOC("RAMB18_X0Y40"), .WRITE_MODE_A("WRITE_FIRST"))
@@ -293,6 +296,29 @@ module roi_bram18_write_mode_b(input clk, input [255:0] din, output [255:0] dout
             r0(.clk(clk), .din(din[  0 +: 8]), .dout(dout[  0 +: 8]));
 endmodule
 
+/******************************************************************************
+RAM_MODE
+******************************************************************************/
+
+module roi_bram18_ram_mode_tdp(input clk, input [255:0] din, output [255:0] dout);
+    ram_RAMB18E1 #(.LOC("RAMB18_X0Y40"), .RAM_MODE("TDP"))
+            r0(.clk(clk), .din(din[  0 +: 8]), .dout(dout[  0 +: 8]));
+endmodule
+
+/*
+ERROR: [DRC REQP-1931] RAMB18E1_WEA_NO_CONNECT_OR_TIED_GND:
+roi/r0/ram programming per UG473 requires that for SDP mode the WEA bus must be unconnected
+or tied to GND.
+
+Are these routing bits are real bits we need to look at?
+> bit_0002031b_002_00
+> bit_0002031b_002_04
+*/
+module roi_bram18_ram_mode_sdp(input clk, input [255:0] din, output [255:0] dout);
+    ram_RAMB18E1 #(.LOC("RAMB18_X0Y40"), .RAM_MODE("SDP"))
+            r0(.clk(clk), .din(din[  0 +: 8]), .dout(dout[  0 +: 8]));
+endmodule
+
 /******************************************************************************
 Library
 ******************************************************************************/