/*********************************************************/
// MODULE:		Dual Port RAM
//
// FILE NAME:	dual.v
// VERSION:		1.0
// DATE:		January 1, 1999
// AUTHOR:		Bob Zeidman, Zeidman Consulting
// 
// CODE TYPE:	Behavioral and RTL
//
// DESCRIPTION:	This module defines a Synchronous Dual Port
// Random Access Memory.
//
/*********************************************************/

// DEFINES
`define DEL	1			// Clock-to-output delay. Zero
						// time delays can be confusing
						// and sometimes cause problems.

`define RAM_WIDTH 8		// Width of RAM (number of bits)
`define RAM_DEPTH 16	// Depth of RAM (number of bytes)
`define ADDR_SZ 4		// Number of bits required to
						// represent the RAM address

// TOP MODULE
module Dual(
		clk,
		data_in,
		rd_address,
		read,
		data_out,
		wr_address,
		write);

// INPUTS
input			   		clk;	   	// RAM clock
input [`RAM_WIDTH-1:0]	data_in;	// RAM data input
input [`ADDR_SZ-1:0]	rd_address;	// RAM read address
input				 	read;  		// Read control
input [`ADDR_SZ-1:0]	wr_address;	// RAM write address
input				 	write;     	// Write control

// OUTPUTS
output [`RAM_WIDTH-1:0]	data_out;	// RAM data output

// INOUTS

// SIGNAL DECLARATIONS
wire			   		clk;
wire [`RAM_WIDTH-1:0]	data_in;
wire [`ADDR_SZ-1:0]		rd_address;
wire				 	read;
wire [`ADDR_SZ-1:0]		wr_address;
wire				 	write;
reg  [`RAM_WIDTH-1:0]	data_out;

								// The RAM
reg [`RAM_WIDTH-1:0]	mem [`RAM_DEPTH-1:0];

// PARAMETERS

// ASSIGN STATEMENTS

// MAIN CODE

// Look at the rising edge of the clock
always @(posedge clk) begin
	if (write)
		mem[wr_address] <= #`DEL data_in;

	if (read)
		data_out <= #`DEL mem[rd_address];
end
endmodule		// Dual