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///////////////////////////////////////////////////////////////////////
////                                                               ////
////  WISHBONE rev.B2 Wishbone Master model                        ////
////                                                               ////
////                                                               ////
////  Author: Richard Herveille                                    ////
////          richard@asics.ws                                     ////
////          www.asics.ws                                         ////
////                                                               ////
////  Downloaded from: http://www.opencores.org/projects/mem_ctrl  ////
////                                                               ////
///////////////////////////////////////////////////////////////////////
////                                                               ////
//// Copyright (C) 2001 Richard Herveille                          ////
////                    richard@asics.ws                           ////
////                                                               ////
//// This source file may be used and distributed without          ////
//// restriction provided that this copyright statement is not     ////
//// removed from the file and that any derivative work contains   ////
//// the original copyright notice and the associated disclaimer.  ////
////                                                               ////
////     THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY       ////
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED     ////
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS     ////
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR        ////
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,           ////
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES      ////
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE     ////
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR          ////
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    ////
//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT    ////
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT    ////
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE           ////
//// POSSIBILITY OF SUCH DAMAGE.                                   ////
////                                                               ////
///////////////////////////////////////////////////////////////////////
 
//  CVS Log
//
//  $Id: wb_master_model.v,v 1.4 2004/02/28 15:40:42 rherveille Exp $
//
//  $Date: 2004/02/28 15:40:42 $
//  $Revision: 1.4 $
//  $Author: rherveille $
//  $Locker:  $
//  $State: Exp $
//
// Change History:
//
`include "timescale.v"
 
module wb_master_model  #(parameter dwidth = 32,
                          parameter awidth = 32)
(clk, rst, adr, din, dout, cyc, stb, we, sel, ack, err, rty);
 
 
input                  clk, rst;
output [awidth   -1:0]  adr;
input  [dwidth   -1:0]  din;
output [dwidth   -1:0]  dout;
output                 cyc, stb;
output                          we;
output [dwidth/8 -1:0] sel;
input                           ack, err, rty;
 
////////////////////////////////////////////////////////////////////
//
// Local Wires
//
 
reg     [awidth   -1:0] adr;
reg     [dwidth   -1:0] dout;
reg                            cyc, stb;
reg                            we;
reg [dwidth/8 -1:0] sel;
 
reg [dwidth   -1:0] q;
 
event test_command_start;
event test_command_mid;
event test_command_end;
 
////////////////////////////////////////////////////////////////////
//
// Memory Logic
//
 
initial
        begin
                //adr = 32'hxxxx_xxxx;
                //adr = 0;
                adr  = {awidth{1'bx}};
                dout = {dwidth{1'bx}};
                cyc  = 1'b0;
                stb  = 1'bx;
                we   = 1'hx;
                sel  = {dwidth/8{1'bx}};
                #1;
                $display("\nINFO: WISHBONE MASTER MODEL INSTANTIATED (%m)");
        end
 
////////////////////////////////////////////////////////////////////
//
// Wishbone write cycle
//
 
task wb_write;
        input   delay;
        integer delay;
 
        input   [awidth -1:0]   a;
        input   [dwidth -1:0]   d;
 
        begin
                -> test_command_start;
                // wait initial delay
                repeat(delay) @(posedge clk);
 
                // assert wishbone signal
                #1;
                adr  = a;
                dout = d;
                cyc  = 1'b1;
                stb  = 1'b1;
                we   = 1'b1;
                sel  = {dwidth/8{1'b1}};
                @(posedge clk);
                -> test_command_mid;
 
                // wait for acknowledge from slave
                while(~ack)     @(posedge clk);
                -> test_command_mid;
 
                // negate wishbone signals
                #1;
                cyc  = 1'b0;
                stb  = 1'bx;
                adr  = {awidth{1'bx}};
                dout = {dwidth{1'bx}};
                we   = 1'hx;
                sel  = {dwidth/8{1'bx}};
                -> test_command_end;
 
        end
endtask
 
////////////////////////////////////////////////////////////////////
//
// Wishbone read cycle
//
 
task wb_read;
        input   delay;
        integer delay;
 
        input   [awidth -1:0]  a;
        output  [dwidth -1:0]  d;
 
        begin
 
                // wait initial delay
                repeat(delay) @(posedge clk);
 
                // assert wishbone signals
                #1;
                adr  = a;
                dout = {dwidth{1'bx}};
                cyc  = 1'b1;
                stb  = 1'b1;
                we   = 1'b0;
                sel  = {dwidth/8{1'b1}};
                @(posedge clk);
 
                // wait for acknowledge from slave
                while(~ack)     @(posedge clk);
 
                // negate wishbone signals
                d    = din; // Grab the data on the posedge of clock
                #1;         // Delay the clearing (hold time of the control signals
                cyc  = 1'b0;
                stb  = 1'bx;
                adr  = {awidth{1'bx}};
                dout = {dwidth{1'bx}};
                we   = 1'hx;
                sel  = {dwidth/8{1'bx}};
 
        end
endtask
 
////////////////////////////////////////////////////////////////////
//
// Wishbone compare cycle (read data from location and compare with expected data)
//
 
task wb_cmp;
        input   delay;
        integer delay;
 
        input [awidth -1:0]     a;
        input [dwidth -1:0]     d_exp;
 
        begin
                wb_read (delay, a, q);
 
                if (d_exp !== q)
                        $display("Data compare error at address %h. Received %h, expected %h at time %t", a, q, d_exp, $time);
        end
endtask
 
endmodule
 
 

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[/] [xgate/] [trunk/] [bench/] [verilog/] [wb_master_model.v] - Blame information for rev 2

Line No.	Rev	Author	Line
1	2	rehayes	`///////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// WISHBONE rev.B2 Wishbone Master model ////`
4			`//// ////`
5			`//// ////`
6			`//// Author: Richard Herveille ////`
7			`//// richard@asics.ws ////`
8			`//// www.asics.ws ////`
9			`//// ////`
10			`//// Downloaded from: http://www.opencores.org/projects/mem_ctrl ////`
11			`//// ////`
12			`///////////////////////////////////////////////////////////////////////`
13			`//// ////`
14			`//// Copyright (C) 2001 Richard Herveille ////`
15			`//// richard@asics.ws ////`
16			`//// ////`
17			`//// This source file may be used and distributed without ////`
18			`//// restriction provided that this copyright statement is not ////`
19			`//// removed from the file and that any derivative work contains ////`
20			`//// the original copyright notice and the associated disclaimer. ////`
21			`//// ////`
22			//// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ////
23			`//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ////`
24			`//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ////`
25			`//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ////`
26			`//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ////`
27			`//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ////`
28			`//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ////`
29			`//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ////`
30			`//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ////`
31			`//// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ////`
32			`//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ////`
33			`//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ////`
34			`//// POSSIBILITY OF SUCH DAMAGE. ////`
35			`//// ////`
36			`///////////////////////////////////////////////////////////////////////`
37
38			`// CVS Log`
39			`//`
40			`// $Id: wb_master_model.v,v 1.4 2004/02/28 15:40:42 rherveille Exp $`
41			`//`
42			`// $Date: 2004/02/28 15:40:42 $`
43			`// $Revision: 1.4 $`
44			`// $Author: rherveille $`
45			`// $Locker: $`
46			`// $State: Exp $`
47			`//`
48			`// Change History:`
49			`//`
50			`include "timescale.v"
51
52			`module wb_master_model #(parameter dwidth = 32,`
53			`parameter awidth = 32)`
54			`(clk, rst, adr, din, dout, cyc, stb, we, sel, ack, err, rty);`
55
56
57			`input clk, rst;`
58			`output [awidth -1:0] adr;`
59			`input [dwidth -1:0] din;`
60			`output [dwidth -1:0] dout;`
61			`output cyc, stb;`
62			`output we;`
63			`output [dwidth/8 -1:0] sel;`
64			`input ack, err, rty;`
65
66			`////////////////////////////////////////////////////////////////////`
67			`//`
68			`// Local Wires`
69			`//`
70
71			`reg [awidth -1:0] adr;`
72			`reg [dwidth -1:0] dout;`
73			`reg cyc, stb;`
74			`reg we;`
75			`reg [dwidth/8 -1:0] sel;`
76
77			`reg [dwidth -1:0] q;`
78
79			`event test_command_start;`
80			`event test_command_mid;`
81			`event test_command_end;`
82
83			`////////////////////////////////////////////////////////////////////`
84			`//`
85			`// Memory Logic`
86			`//`
87
88			`initial`
89			`begin`
90			`//adr = 32'hxxxx_xxxx;`
91			`//adr = 0;`
92			`adr = {awidth{1'bx}};`
93			`dout = {dwidth{1'bx}};`
94			`cyc = 1'b0;`
95			`stb = 1'bx;`
96			`we = 1'hx;`
97			`sel = {dwidth/8{1'bx}};`
98			`#1;`
99			`$display("\nINFO: WISHBONE MASTER MODEL INSTANTIATED (%m)");`
100			`end`
101
102			`////////////////////////////////////////////////////////////////////`
103			`//`
104			`// Wishbone write cycle`
105			`//`
106
107			`task wb_write;`
108			`input delay;`
109			`integer delay;`
110
111			`input [awidth -1:0] a;`
112			`input [dwidth -1:0] d;`
113
114			`begin`
115			`-> test_command_start;`
116			`// wait initial delay`
117			`repeat(delay) @(posedge clk);`
118
119			`// assert wishbone signal`
120			`#1;`
121			`adr = a;`
122			`dout = d;`
123			`cyc = 1'b1;`
124			`stb = 1'b1;`
125			`we = 1'b1;`
126			`sel = {dwidth/8{1'b1}};`
127			`@(posedge clk);`
128			`-> test_command_mid;`
129
130			`// wait for acknowledge from slave`
131			`while(~ack) @(posedge clk);`
132			`-> test_command_mid;`
133
134			`// negate wishbone signals`
135			`#1;`
136			`cyc = 1'b0;`
137			`stb = 1'bx;`
138			`adr = {awidth{1'bx}};`
139			`dout = {dwidth{1'bx}};`
140			`we = 1'hx;`
141			`sel = {dwidth/8{1'bx}};`
142			`-> test_command_end;`
143
144			`end`
145			`endtask`
146
147			`////////////////////////////////////////////////////////////////////`
148			`//`
149			`// Wishbone read cycle`
150			`//`
151
152			`task wb_read;`
153			`input delay;`
154			`integer delay;`
155
156			`input [awidth -1:0] a;`
157			`output [dwidth -1:0] d;`
158
159			`begin`
160
161			`// wait initial delay`
162			`repeat(delay) @(posedge clk);`
163
164			`// assert wishbone signals`
165			`#1;`
166			`adr = a;`
167			`dout = {dwidth{1'bx}};`
168			`cyc = 1'b1;`
169			`stb = 1'b1;`
170			`we = 1'b0;`
171			`sel = {dwidth/8{1'b1}};`
172			`@(posedge clk);`
173
174			`// wait for acknowledge from slave`
175			`while(~ack) @(posedge clk);`
176
177			`// negate wishbone signals`
178			`d = din; // Grab the data on the posedge of clock`
179			`#1; // Delay the clearing (hold time of the control signals`
180			`cyc = 1'b0;`
181			`stb = 1'bx;`
182			`adr = {awidth{1'bx}};`
183			`dout = {dwidth{1'bx}};`
184			`we = 1'hx;`
185			`sel = {dwidth/8{1'bx}};`
186
187			`end`
188			`endtask`
189
190			`////////////////////////////////////////////////////////////////////`
191			`//`
192			`// Wishbone compare cycle (read data from location and compare with expected data)`
193			`//`
194
195			`task wb_cmp;`
196			`input delay;`
197			`integer delay;`
198
199			`input [awidth -1:0] a;`
200			`input [dwidth -1:0] d_exp;`
201
202			`begin`
203			`wb_read (delay, a, q);`
204
205			`if (d_exp !== q)`
206			`$display("Data compare error at address %h. Received %h, expected %h at time %t", a, q, d_exp, $time);`
207			`end`
208			`endtask`
209
210			`endmodule`
211
212