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7.4

verilog RAM testbench

Asked by boardergirl in Miscellaneous Programming

Tags: ram, verilog, testbench

Hi

I found the below verilog RAM code on this website:

http://www.asic-world.com/examples/verilog/ram_sp_sr_sw.html#Single_Port_RAM_Synchronous_Read/Write

Could someone tell me how to write the testbench for this Single Port Synchronous Read/Write RAM ?

I want to print out the addresses and the values as they get written and read.

thanks.

1  //===========================================
2 // Function : Synchronous read write RAM  
3 // Coder : Deepak Kumar Tala
4 // Date : 18-April-2002
5 //===========================================
6 module ram_sp_sr_sw (
7 clk , // Clock Input
8 address , // Address Input
9 data , // Data bi-directional
10 cs , // Chip Select
11 we , // Write Enable/Read Enable
12 oe // Output Enable
13 );  
14  
15 parameter DATA_WIDTH = 8 ;
16 parameter ADDR_WIDTH = 8 ;
17 parameter RAM_DEPTH = 1 << ADDR_WIDTH;
18  
19 //--------------Input Ports-----------------------  
20 input clk ;
21 input [ADDR_WIDTH-1:0] address ;
22 input cs ;
23 input we ;
24 input oe ;  
25  
26 //--------------Inout Ports-----------------------  
27 inout [DATA_WIDTH-1:0] data ;
28  
29 //--------------Internal variables----------------  
30 reg [DATA_WIDTH-1:0] data_out ;
31 reg [DATA_WIDTH-1:0] mem [0:RAM_DEPTH-1];
32  
33 //--------------Code Starts Here------------------  
34  
35 // Tri-State Buffer control  
36 // output : When we = 0, oe = 1, cs = 1
37 assign data = (cs && oe && !we) ? data_out : 8'bz;  
38  
39 // Memory Write Block  
40 // Write Operation : When we = 1, cs = 1
41 always @ (posedge clk)
42 begin : MEM_WRITE
43   if ( cs && we ) begin
44     mem[address] = data;
45   end
46 end
47  
48 // Memory Read Block  
49 // Read Operation : When we = 0, oe = 1, cs = 1
50 always @ (posedge clk)
51 begin : MEM_READ
52   if (cs && !we && oe) begin
53     data_out = mem[address];
54   end
55 end
56  
57 endmodule // End of Module ram_sp_sr_sw
[+][-]07/04/06 05:07 PM, ID: 17039592Accepted Solution

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About this solution

Zone: Miscellaneous Programming
Tags: ram, verilog, testbench
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Solution Provided By: hykes
Participating Experts: 2
Solution Grade: A
 
[+][-]06/28/06 05:03 AM, ID: 17000269Expert Comment

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[+][-]08/01/06 01:23 PM, ID: 17227849Expert Comment

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[+][-]08/06/06 01:24 AM, ID: 17258107Administrative Comment

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