OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [orpsocv2/] [boards/] [actel/] [ordb1a3pe1500/] [rtl/] [verilog/] [versatile_mem_ctrl/] [rtl/] [verilog/] [codec.v] - Blame information for rev 408

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 408 julius 
`timescale 1ns/1ns
2 
module encode (
3 
    fifo_empty_0, fifo_empty_1, fifo_empty_2, fifo_empty_3,
4 
    fifo_sel, fifo_sel_domain
5 
);
6 
 
7 
input  [0:15] fifo_empty_0, fifo_empty_1, fifo_empty_2, fifo_empty_3;
8 
output [0:15] fifo_sel;
9 
output [1:0]  fifo_sel_domain;
10 
 
11 
function [0:15] encode;
12 
input [0:15] a;
13 
input [0:15] b;
14 
input [0:15] c;
15 
input [0:15] d;
16 
integer i;
17 
begin
18 
    if (!(&d))
19 
        casex (d)
20 
        16'b0xxxxxxxxxxxxxxx: encode = 16'b1000000000000000;
21 
        16'b10xxxxxxxxxxxxxx: encode = 16'b0100000000000000;
22 
        16'b110xxxxxxxxxxxxx: encode = 16'b0010000000000000;
23 
        16'b1110xxxxxxxxxxxx: encode = 16'b0001000000000000;
24 
        16'b11110xxxxxxxxxxx: encode = 16'b0000100000000000;
25 
        16'b111110xxxxxxxxxx: encode = 16'b0000010000000000;
26 
        16'b1111110xxxxxxxxx: encode = 16'b0000001000000000;
27 
        16'b11111110xxxxxxxx: encode = 16'b0000000100000000;
28 
        16'b111111110xxxxxxx: encode = 16'b0000000010000000;
29 
        16'b1111111110xxxxxx: encode = 16'b0000000001000000;
30 
        16'b11111111110xxxxx: encode = 16'b0000000000100000;
31 
        16'b111111111110xxxx: encode = 16'b0000000000010000;
32 
        16'b1111111111110xxx: encode = 16'b0000000000001000;
33 
        16'b11111111111110xx: encode = 16'b0000000000000100;
34 
        16'b111111111111110x: encode = 16'b0000000000000010;
35 
        16'b1111111111111110: encode = 16'b0000000000000001;
36 
        default:              encode = 16'b0000000000000000;
37 
        endcase
38 
    else if (!(&c))
39 
        casex (c)
40 
        16'b0xxxxxxxxxxxxxxx: encode = 16'b1000000000000000;
41 
        16'b10xxxxxxxxxxxxxx: encode = 16'b0100000000000000;
42 
        16'b110xxxxxxxxxxxxx: encode = 16'b0010000000000000;
43 
        16'b1110xxxxxxxxxxxx: encode = 16'b0001000000000000;
44 
        16'b11110xxxxxxxxxxx: encode = 16'b0000100000000000;
45 
        16'b111110xxxxxxxxxx: encode = 16'b0000010000000000;
46 
        16'b1111110xxxxxxxxx: encode = 16'b0000001000000000;
47 
        16'b11111110xxxxxxxx: encode = 16'b0000000100000000;
48 
        16'b111111110xxxxxxx: encode = 16'b0000000010000000;
49 
        16'b1111111110xxxxxx: encode = 16'b0000000001000000;
50 
        16'b11111111110xxxxx: encode = 16'b0000000000100000;
51 
        16'b111111111110xxxx: encode = 16'b0000000000010000;
52 
        16'b1111111111110xxx: encode = 16'b0000000000001000;
53 
        16'b11111111111110xx: encode = 16'b0000000000000100;
54 
        16'b111111111111110x: encode = 16'b0000000000000010;
55 
        16'b1111111111111110: encode = 16'b0000000000000001;
56 
        default:              encode = 16'b0000000000000000;
57 
        endcase
58 
    else if (!(&b))
59 
        casex (b)
60 
        16'b0xxxxxxxxxxxxxxx: encode = 16'b1000000000000000;
61 
        16'b10xxxxxxxxxxxxxx: encode = 16'b0100000000000000;
62 
        16'b110xxxxxxxxxxxxx: encode = 16'b0010000000000000;
63 
        16'b1110xxxxxxxxxxxx: encode = 16'b0001000000000000;
64 
        16'b11110xxxxxxxxxxx: encode = 16'b0000100000000000;
65 
        16'b111110xxxxxxxxxx: encode = 16'b0000010000000000;
66 
        16'b1111110xxxxxxxxx: encode = 16'b0000001000000000;
67 
        16'b11111110xxxxxxxx: encode = 16'b0000000100000000;
68 
        16'b111111110xxxxxxx: encode = 16'b0000000010000000;
69 
        16'b1111111110xxxxxx: encode = 16'b0000000001000000;
70 
        16'b11111111110xxxxx: encode = 16'b0000000000100000;
71 
        16'b111111111110xxxx: encode = 16'b0000000000010000;
72 
        16'b1111111111110xxx: encode = 16'b0000000000001000;
73 
        16'b11111111111110xx: encode = 16'b0000000000000100;
74 
        16'b111111111111110x: encode = 16'b0000000000000010;
75 
        16'b1111111111111110: encode = 16'b0000000000000001;
76 
        default:              encode = 16'b0000000000000000;
77 
        endcase
78 
    else
79 
        casex (a)
80 
        16'b0xxxxxxxxxxxxxxx: encode = 16'b1000000000000000;
81 
        16'b10xxxxxxxxxxxxxx: encode = 16'b0100000000000000;
82 
        16'b110xxxxxxxxxxxxx: encode = 16'b0010000000000000;
83 
        16'b1110xxxxxxxxxxxx: encode = 16'b0001000000000000;
84 
        16'b11110xxxxxxxxxxx: encode = 16'b0000100000000000;
85 
        16'b111110xxxxxxxxxx: encode = 16'b0000010000000000;
86 
        16'b1111110xxxxxxxxx: encode = 16'b0000001000000000;
87 
        16'b11111110xxxxxxxx: encode = 16'b0000000100000000;
88 
        16'b111111110xxxxxxx: encode = 16'b0000000010000000;
89 
        16'b1111111110xxxxxx: encode = 16'b0000000001000000;
90 
        16'b11111111110xxxxx: encode = 16'b0000000000100000;
91 
        16'b111111111110xxxx: encode = 16'b0000000000010000;
92 
        16'b1111111111110xxx: encode = 16'b0000000000001000;
93 
        16'b11111111111110xx: encode = 16'b0000000000000100;
94 
        16'b111111111111110x: encode = 16'b0000000000000010;
95 
        16'b1111111111111110: encode = 16'b0000000000000001;
96 
        default:              encode = 16'b0000000000000000;
97 
        endcase
98 
end
99 
endfunction
100 
 
101 
assign fifo_sel = encode( fifo_empty_0, fifo_empty_1, fifo_empty_2, fifo_empty_3);
102 
assign fifo_sel_domain = (!(&fifo_empty_3)) ? 2'b11 :
103 
                         (!(&fifo_empty_2)) ? 2'b10 :
104 
                         (!(&fifo_empty_1)) ? 2'b01 :
105 
                         2'b00;
106 
 
107 
endmodule
108 
 
109 
`timescale 1ns/1ns
110 
module decode (
111 
    fifo_sel, fifo_sel_domain,
112 
    fifo_we_0, fifo_we_1, fifo_we_2, fifo_we_3
113 
);
114 
 
115 
input  [0:15] fifo_sel;
116 
input  [1:0]  fifo_sel_domain;
117 
output [0:15] fifo_we_0, fifo_we_1, fifo_we_2, fifo_we_3;
118 
 
119 
assign fifo_we_0 = (fifo_sel_domain == 2'b00) ? fifo_sel : {16{1'b0}};
120 
assign fifo_we_1 = (fifo_sel_domain == 2'b01) ? fifo_sel : {16{1'b0}};
121 
assign fifo_we_2 = (fifo_sel_domain == 2'b10) ? fifo_sel : {16{1'b0}};
122 
assign fifo_we_3 = (fifo_sel_domain == 2'b11) ? fifo_sel : {16{1'b0}};
123 
 
124 
endmodule

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.