Towards Xilinx bram support

1 files changed, 73 insertions, 0 deletions

diff --git a/techlibs/xilinx/tests/bram1_tb.v b/techlibs/xilinx/tests/bram1_tb.v
new file mode 100644
index 000000000..98e6bafe6
--- /dev/null
+++ b/techlibs/xilinx/tests/bram1_tb.v
@@ -0,0 +1,73 @@
+module bram1_tb #(
+	parameter ABITS = 8, DBITS = 8, TRANSP = 0
+);
+	reg clk;
+	reg [ABITS-1:0] WR_ADDR;
+	reg [DBITS-1:0] WR_DATA;
+	reg WR_EN;
+	reg [ABITS-1:0] RD_ADDR;
+	wire [DBITS-1:0] RD_DATA;
+
+	bram1 #(
+		// .ABITS(ABITS),
+		// .DBITS(DBITS),
+		// .TRANSP(TRANSP)
+	) uut  (
+		.clk    (clk    ),
+		.WR_ADDR(WR_ADDR),
+		.WR_DATA(WR_DATA),
+		.WR_EN  (WR_EN  ),
+		.RD_ADDR(RD_ADDR),
+		.RD_DATA(RD_DATA)
+	);
+
+	function [31:0] getaddr(input [3:0] n);
+		begin
+			case (n)
+				0: getaddr = 0;
+				1: getaddr = 2**ABITS-1;
+				2: getaddr = 'b101 << (ABITS / 3);
+				3: getaddr = 'b101 << (2*ABITS / 3);
+				4: getaddr = 'b11011 << (ABITS / 4);
+				5: getaddr = 'b11011 << (2*ABITS / 4);
+				6: getaddr = 'b11011 << (3*ABITS / 4);
+				7: getaddr = 123456789;
+				default: getaddr = 1 << (2*n-16);
+			endcase
+		end
+	endfunction
+
+	reg [DBITS-1:0] memory [0:2**ABITS-1];
+	reg [DBITS-1:0] expected_rd;
+
+	integer i, j;
+	initial begin
+		$dumpfile("testbench.vcd");
+		$dumpvars(0, bram1_tb);
+		clk <= 0;
+		for (i = 0; i < 256; i = i+1) begin
+			WR_DATA <= i;
+			WR_ADDR <= getaddr(i[7:4]);
+			RD_ADDR <= getaddr(i[3:0]);
+			WR_EN <= ^i;
+
+			#1; clk <= 1;
+			#1; clk <= 0;
+
+			if (TRANSP) begin
+				if (WR_EN) memory[WR_ADDR] = WR_DATA;
+				expected_rd = memory[RD_ADDR];
+			end else begin
+				expected_rd = memory[RD_ADDR];
+				if (WR_EN) memory[WR_ADDR] = WR_DATA;
+			end
+
+			for (j = 0; j < DBITS; j = j+1) begin
+				if (expected_rd[j] === 1'bx)
+					expected_rd[j] = RD_DATA[j];
+			end
+
+			$display("#OUT# | WA=%x WD=%x WE=%x | RA=%x RD=%x | %s", WR_ADDR, WR_DATA, WR_EN, RD_ADDR, RD_DATA, expected_rd === RD_DATA ? "ok" : "ERROR");
+		end
+	end
+endmodule