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// Copyright 2015, Brian Swetland <swetland@frotz.net>
// Licensed under the Apache License, Version 2.0.
`timescale 1ns / 1ps
import "DPI-C" function void dpi_mem_write(int addr, int data);
import "DPI-C" function void dpi_mem_read(int addr, output int data);
module simram(
input clk,
input [15:0]waddr,
input [15:0]wdata,
input we,
input [15:0]raddr,
output reg [15:0]rdata,
input re
);
wire [31:0]rawdata;
wire [31:0]junk;
// hack: this should be posedge but if we do that
// then the dpi_mem_write() happens too early
always @(negedge clk) begin
if (we) begin
$display(":WRI %08x %08x", waddr, wdata);
dpi_mem_write({16'd0, waddr}, {16'd0, wdata});
end
end
always @(posedge clk) begin
if (re) begin
dpi_mem_read({16'd0, raddr}, rawdata);
rdata <= rawdata[15:0];
end else begin
//junk = $random();
//rdata <= junk[15:0];
rdata <= 16'hEEEE;
end
end
endmodule
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