From d19866615b5cb1ad24d28df544071dd65f6df78a Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Mon, 6 Apr 2015 13:03:37 +0200
Subject: Added Xilinx test case for initialized brams

---
 techlibs/xilinx/tests/.gitignore |  3 +++
 techlibs/xilinx/tests/bram2.sh   |  8 +++++++
 techlibs/xilinx/tests/bram2.v    | 24 +++++++++++++++++++++
 techlibs/xilinx/tests/bram2_tb.v | 45 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 80 insertions(+)
 create mode 100644 techlibs/xilinx/tests/bram2.sh
 create mode 100644 techlibs/xilinx/tests/bram2.v
 create mode 100644 techlibs/xilinx/tests/bram2_tb.v

diff --git a/techlibs/xilinx/tests/.gitignore b/techlibs/xilinx/tests/.gitignore
index bc2f8bab..496b8746 100644
--- a/techlibs/xilinx/tests/.gitignore
+++ b/techlibs/xilinx/tests/.gitignore
@@ -1,3 +1,6 @@
 bram1_cmp
 bram1.mk
 bram1_[0-9]*/
+bram2.log
+bram2_syn.v
+bram2_tb
diff --git a/techlibs/xilinx/tests/bram2.sh b/techlibs/xilinx/tests/bram2.sh
new file mode 100644
index 00000000..d8d8ed30
--- /dev/null
+++ b/techlibs/xilinx/tests/bram2.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -ex
+unisims=/opt/Xilinx/Vivado/2014.4/data/verilog/src/unisims
+../../../yosys -v2 -l bram2.log -p synth_xilinx -o bram2_syn.v bram2.v
+iverilog -o bram2_tb bram2_tb.v bram2_syn.v -y $unisims $unisims/../glbl.v
+vvp -N bram2_tb
+
diff --git a/techlibs/xilinx/tests/bram2.v b/techlibs/xilinx/tests/bram2.v
new file mode 100644
index 00000000..9444fb17
--- /dev/null
+++ b/techlibs/xilinx/tests/bram2.v
@@ -0,0 +1,24 @@
+module myram(
+	input		  rd_clk,
+	input	   [ 7:0] rd_addr,
+	output reg [15:0] rd_data,
+	input		  wr_clk,
+	input		  wr_enable,
+	input	   [ 7:0] wr_addr,
+	input	   [15:0] wr_data
+);
+	reg [15:0] memory [0:255];
+	integer i;
+
+	initial begin
+		for (i = 0; i < 256; i = i+1)
+			memory[i] = i;
+	end
+
+	always @(posedge rd_clk)
+		rd_data <= memory[rd_addr];
+
+	always @(posedge wr_clk)
+		if (wr_enable)
+			memory[wr_addr] <= wr_data;
+endmodule
diff --git a/techlibs/xilinx/tests/bram2_tb.v b/techlibs/xilinx/tests/bram2_tb.v
new file mode 100644
index 00000000..3a43b655
--- /dev/null
+++ b/techlibs/xilinx/tests/bram2_tb.v
@@ -0,0 +1,45 @@
+`timescale 1 ns / 1 ps
+
+module testbench;
+	reg         rd_clk;
+	reg  [ 7:0] rd_addr;
+	wire [15:0] rd_data;
+
+	wire        wr_clk    = 0;
+	wire        wr_enable = 0;
+	wire [ 7:0] wr_addr   = 0;
+	wire [15:0] wr_data   = 0;
+
+	myram uut (
+		.rd_clk   (rd_clk   ),
+		.rd_addr  (rd_addr  ),
+		.rd_data  (rd_data  ),
+		.wr_clk   (wr_clk   ),
+		.wr_enable(wr_enable),
+		.wr_addr  (wr_addr  ),
+		.wr_data  (wr_data  )
+	);
+
+	initial begin
+		rd_clk = 0;
+		#1000;
+		forever #10 rd_clk <= ~rd_clk;
+	end
+
+	integer i;
+	initial begin
+		rd_addr <= 0;
+		@(posedge rd_clk);
+		for (i = 0; i < 256; i=i+1) begin
+			rd_addr <= rd_addr + 1;
+			@(posedge rd_clk);
+			// $display("%3d %3d", i, rd_data);
+			if (i != rd_data) begin
+				$display("[%1t] ERROR: addr=%3d, data=%3d", $time, i, rd_data);
+				$stop;
+			end
+		end
+		$display("[%1t] Passed bram2 test.", $time);
+		$finish;
+	end
+endmodule
-- 
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