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[/] [socgen/] [trunk/] [common/] [opencores.org/] [cde/] [ip/] [fifo/] [rtl/] [verilog/] [fifo_def] - Blame information for rev 134

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reg                             r;
reg                             w;
reg [SIZE:0]                  push_1;
reg [SIZE:0]                  pop_1;
 
   always@(*)  push_1 =  (push_pointer + 1'b1);
   always@(*)  pop_1  =  (pop_pointer  + 1'b1);
 
 
   always@(*)  r =  (pop_pointer == push_1[SIZE-1:0]);
   always@(*)  w =  (push_pointer == pop_1[SIZE-1:0]);
 
 
 
 
always@(posedge clk)
  if(reset)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= {SIZE{1'b0}};
                                pop_pointer  <= {SIZE{1'b0}};
                                end
  else
  if(empty && !full)
       if( push && ~pop)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer+1;
                                pop_pointer  <= pop_pointer;
                                end
       else
       if(~push &&  pop)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b1;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer;
                                end
       else
       if( push &&  pop)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer +  1;
                                pop_pointer  <= pop_pointer + 1;
                                end
       else
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer;
                                end
   else
   if(!empty && !full)
       if( push &&  pop)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer +  1;
                                pop_pointer  <= pop_pointer + 1;
                                end
       else
       if( push && !pop && r)
                                begin
                                full         <=  1'b1;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer+1;
                                pop_pointer  <= pop_pointer;
                                end
       else
       if( push && !pop && !r)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer+1;
                                pop_pointer  <= pop_pointer;
                                end
       else
       if(~push &&  pop && w)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer+1;
                                end
       else
       if(~push &&  pop && !w)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer+1;
                                end
       else
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer;
                                end
  else
  if(!empty && full)
      if( push && ~pop)
                                begin
                                full         <=  1'b1;
                                empty        <=  1'b0;
                                over_run     <=  1'b1;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer;
                                end
       else
       if(~push &&  pop)
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer+1;
                                end
       else
       if( push &&  pop)
                                begin
                                full         <=  1'b1;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer +  1;
                                pop_pointer  <= pop_pointer + 1;
                                end
       else
                                begin
                                full         <=  1'b1;
                                empty        <=  1'b0;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= push_pointer;
                                pop_pointer  <= pop_pointer;
                                end
//  full and empty at the same time should never occur
 
 
    else
                                begin
                                full         <=  1'b0;
                                empty        <=  1'b1;
                                over_run     <=  1'b0;
                                under_run    <=  1'b0;
                                push_pointer <= {SIZE{1'b0}};
                                pop_pointer  <= {SIZE{1'b0}};
                                end
 
 
 
 
 

Line No.	Rev	Author	Line
1	134	jt_eaton	`reg r;`
2			`reg w;`
3			`reg [SIZE:0] push_1;`
4			`reg [SIZE:0] pop_1;`
5
6			`always@(*) push_1 = (push_pointer + 1'b1);`
7			`always@(*) pop_1 = (pop_pointer + 1'b1);`
8
9
10			`always@(*) r = (pop_pointer == push_1[SIZE-1:0]);`
11			`always@(*) w = (push_pointer == pop_1[SIZE-1:0]);`
12
13
14
15
16			`always@(posedge clk)`
17			`if(reset)`
18			`begin`
19			`full <= 1'b0;`
20			`empty <= 1'b1;`
21			`over_run <= 1'b0;`
22			`under_run <= 1'b0;`
23			`push_pointer <= {SIZE{1'b0}};`
24			`pop_pointer <= {SIZE{1'b0}};`
25			`end`
26			`else`
27			`if(empty && !full)`
28			`if( push && ~pop)`
29			`begin`
30			`full <= 1'b0;`
31			`empty <= 1'b0;`
32			`over_run <= 1'b0;`
33			`under_run <= 1'b0;`
34			`push_pointer <= push_pointer+1;`
35			`pop_pointer <= pop_pointer;`
36			`end`
37			`else`
38			`if(~push && pop)`
39			`begin`
40			`full <= 1'b0;`
41			`empty <= 1'b1;`
42			`over_run <= 1'b0;`
43			`under_run <= 1'b1;`
44			`push_pointer <= push_pointer;`
45			`pop_pointer <= pop_pointer;`
46			`end`
47			`else`
48			`if( push && pop)`
49			`begin`
50			`full <= 1'b0;`
51			`empty <= 1'b1;`
52			`over_run <= 1'b0;`
53			`under_run <= 1'b0;`
54			`push_pointer <= push_pointer + 1;`
55			`pop_pointer <= pop_pointer + 1;`
56			`end`
57			`else`
58			`begin`
59			`full <= 1'b0;`
60			`empty <= 1'b1;`
61			`over_run <= 1'b0;`
62			`under_run <= 1'b0;`
63			`push_pointer <= push_pointer;`
64			`pop_pointer <= pop_pointer;`
65			`end`
66			`else`
67			`if(!empty && !full)`
68			`if( push && pop)`
69			`begin`
70			`full <= 1'b0;`
71			`empty <= 1'b0;`
72			`over_run <= 1'b0;`
73			`under_run <= 1'b0;`
74			`push_pointer <= push_pointer + 1;`
75			`pop_pointer <= pop_pointer + 1;`
76			`end`
77			`else`
78			`if( push && !pop && r)`
79			`begin`
80			`full <= 1'b1;`
81			`empty <= 1'b0;`
82			`over_run <= 1'b0;`
83			`under_run <= 1'b0;`
84			`push_pointer <= push_pointer+1;`
85			`pop_pointer <= pop_pointer;`
86			`end`
87			`else`
88			`if( push && !pop && !r)`
89			`begin`
90			`full <= 1'b0;`
91			`empty <= 1'b0;`
92			`over_run <= 1'b0;`
93			`under_run <= 1'b0;`
94			`push_pointer <= push_pointer+1;`
95			`pop_pointer <= pop_pointer;`
96			`end`
97			`else`
98			`if(~push && pop && w)`
99			`begin`
100			`full <= 1'b0;`
101			`empty <= 1'b1;`
102			`over_run <= 1'b0;`
103			`under_run <= 1'b0;`
104			`push_pointer <= push_pointer;`
105			`pop_pointer <= pop_pointer+1;`
106			`end`
107			`else`
108			`if(~push && pop && !w)`
109			`begin`
110			`full <= 1'b0;`
111			`empty <= 1'b0;`
112			`over_run <= 1'b0;`
113			`under_run <= 1'b0;`
114			`push_pointer <= push_pointer;`
115			`pop_pointer <= pop_pointer+1;`
116			`end`
117			`else`
118			`begin`
119			`full <= 1'b0;`
120			`empty <= 1'b0;`
121			`over_run <= 1'b0;`
122			`under_run <= 1'b0;`
123			`push_pointer <= push_pointer;`
124			`pop_pointer <= pop_pointer;`
125			`end`
126			`else`
127			`if(!empty && full)`
128			`if( push && ~pop)`
129			`begin`
130			`full <= 1'b1;`
131			`empty <= 1'b0;`
132			`over_run <= 1'b1;`
133			`under_run <= 1'b0;`
134			`push_pointer <= push_pointer;`
135			`pop_pointer <= pop_pointer;`
136			`end`
137			`else`
138			`if(~push && pop)`
139			`begin`
140			`full <= 1'b0;`
141			`empty <= 1'b0;`
142			`over_run <= 1'b0;`
143			`under_run <= 1'b0;`
144			`push_pointer <= push_pointer;`
145			`pop_pointer <= pop_pointer+1;`
146			`end`
147			`else`
148			`if( push && pop)`
149			`begin`
150			`full <= 1'b1;`
151			`empty <= 1'b0;`
152			`over_run <= 1'b0;`
153			`under_run <= 1'b0;`
154			`push_pointer <= push_pointer + 1;`
155			`pop_pointer <= pop_pointer + 1;`
156			`end`
157			`else`
158			`begin`
159			`full <= 1'b1;`
160			`empty <= 1'b0;`
161			`over_run <= 1'b0;`
162			`under_run <= 1'b0;`
163			`push_pointer <= push_pointer;`
164			`pop_pointer <= pop_pointer;`
165			`end`
166			`// full and empty at the same time should never occur`
167
168
169			`else`
170			`begin`
171			`full <= 1'b0;`
172			`empty <= 1'b1;`
173			`over_run <= 1'b0;`
174			`under_run <= 1'b0;`
175			`push_pointer <= {SIZE{1'b0}};`
176			`pop_pointer <= {SIZE{1'b0}};`
177			`end`
178
179
180
181
182

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[/] [socgen/] [trunk/] [common/] [opencores.org/] [cde/] [ip/] [fifo/] [rtl/] [verilog/] [fifo_def] - Blame information for rev 134