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rng.sv
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/*
*
* Copyright (c) 2019, Mickael Torres
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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.
*
*/
`timescale 1ns / 1ps
module RNG(
input CLK,
input RST,
input RND_IN,
output reg [7:0] OUT,
output reg WE,
input FULL
);
reg [7:0] RND_DAT;
reg [2:0] RND_SHIFT;
reg RND_CNT;
reg [15:0] start;
reg tog;
reg rd;
reg rd_ok;
reg init;
reg [63:0] l0_0;
reg [64:0] l0_1;
reg [65:0] l0_2;
reg [63:0] l1_0;
reg [64:0] l1_1;
reg [65:0] l1_2;
reg [63:0] l2_0;
reg [64:0] l2_1;
reg [65:0] l2_2;
reg [63:0] l3_0;
reg [64:0] l3_1;
reg [65:0] l3_2;
reg [63:0] l4_0;
reg [64:0] l4_1;
reg [65:0] l4_2;
reg [63:0] l5_0;
reg [64:0] l5_1;
reg [65:0] l5_2;
reg [63:0] l6_0;
reg [64:0] l6_1;
reg [65:0] l6_2;
reg [63:0] l7_0;
reg [64:0] l7_1;
reg [65:0] l7_2;
reg [15:0] i_cnt;
reg [3:0] upd;
initial
begin
RND_SHIFT = 0;
start = 0;
tog = 0;
rd = 0;
rd_ok = 0;
init = 0;
i_cnt = 0;
upd = 0;
end
always @(posedge CLK)
begin
if (!RST) begin
rd_ok <= 0;
i_cnt <= 0;
init <= 0;
upd <= 0;
end else begin
if (init == 0) begin
rd_ok <= 0;
if (i_cnt == 208)
init = 1;
else if (rd == 1) begin
rd_ok <= 1;
i_cnt <= i_cnt + 1;
case (i_cnt)
// L0
0: l0_0[7:0] <= RND_DAT;
1: l0_0[15:8] <= RND_DAT;
2: l0_0[23:16] <= RND_DAT;
3: l0_0[31:24] <= RND_DAT;
4: l0_0[39:32] <= RND_DAT;
5: l0_0[47:40] <= RND_DAT;
6: l0_0[55:48] <= RND_DAT;
7: l0_0[63:56] <= RND_DAT;
8: l0_1[7:0] <= RND_DAT;
9: l0_1[15:8] <= RND_DAT;
10: l0_1[23:16] <= RND_DAT;
11: l0_1[31:24] <= RND_DAT;
12: l0_1[39:32] <= RND_DAT;
13: l0_1[47:40] <= RND_DAT;
14: l0_1[55:48] <= RND_DAT;
15: l0_1[63:56] <= RND_DAT;
16: l0_1[64] <= RND_DAT[3];
17: l0_2[7:0] <= RND_DAT;
18: l0_2[15:8] <= RND_DAT;
19: l0_2[23:16] <= RND_DAT;
20: l0_2[31:24] <= RND_DAT;
21: l0_2[39:32] <= RND_DAT;
22: l0_2[47:40] <= RND_DAT;
23: l0_2[55:48] <= RND_DAT;
24: l0_2[63:56] <= RND_DAT;
25: l0_2[65:64] <= RND_DAT[5:4];
// L1
26: l1_0[7:0] <= RND_DAT;
27: l1_0[15:8] <= RND_DAT;
28: l1_0[23:16] <= RND_DAT;
29: l1_0[31:24] <= RND_DAT;
30: l1_0[39:32] <= RND_DAT;
31: l1_0[47:40] <= RND_DAT;
32: l1_0[55:48] <= RND_DAT;
33: l1_0[63:56] <= RND_DAT;
34: l1_1[7:0] <= RND_DAT;
35: l1_1[15:8] <= RND_DAT;
36: l1_1[23:16] <= RND_DAT;
37: l1_1[31:24] <= RND_DAT;
38: l1_1[39:32] <= RND_DAT;
39: l1_1[47:40] <= RND_DAT;
40: l1_1[55:48] <= RND_DAT;
41: l1_1[63:56] <= RND_DAT;
42: l1_1[64] <= RND_DAT[1];
43: l1_2[7:0] <= RND_DAT;
44: l1_2[15:8] <= RND_DAT;
45: l1_2[23:16] <= RND_DAT;
46: l1_2[31:24] <= RND_DAT;
47: l1_2[39:32] <= RND_DAT;
48: l1_2[47:40] <= RND_DAT;
49: l1_2[55:48] <= RND_DAT;
50: l1_2[63:56] <= RND_DAT;
51: l1_2[65:64] <= RND_DAT[7:6];
// L2
52: l2_0[7:0] <= RND_DAT;
53: l2_0[15:8] <= RND_DAT;
54: l2_0[23:16] <= RND_DAT;
55: l2_0[31:24] <= RND_DAT;
56: l2_0[39:32] <= RND_DAT;
57: l2_0[47:40] <= RND_DAT;
58: l2_0[55:48] <= RND_DAT;
59: l2_0[63:56] <= RND_DAT;
60: l2_1[7:0] <= RND_DAT;
61: l2_1[15:8] <= RND_DAT;
62: l2_1[23:16] <= RND_DAT;
63: l2_1[31:24] <= RND_DAT;
64: l2_1[39:32] <= RND_DAT;
65: l2_1[47:40] <= RND_DAT;
66: l2_1[55:48] <= RND_DAT;
67: l2_1[63:56] <= RND_DAT;
68: l2_1[64] <= RND_DAT[0];
69: l2_2[7:0] <= RND_DAT;
70: l2_2[15:8] <= RND_DAT;
71: l2_2[23:16] <= RND_DAT;
72: l2_2[31:24] <= RND_DAT;
73: l2_2[39:32] <= RND_DAT;
74: l2_2[47:40] <= RND_DAT;
75: l2_2[55:48] <= RND_DAT;
76: l2_2[63:56] <= RND_DAT;
77: l2_2[65:64] <= RND_DAT[3:2];
// L3
78: l3_0[7:0] <= RND_DAT;
79: l3_0[15:8] <= RND_DAT;
80: l3_0[23:16] <= RND_DAT;
81: l3_0[31:24] <= RND_DAT;
82: l3_0[39:32] <= RND_DAT;
83: l3_0[47:40] <= RND_DAT;
84: l3_0[55:48] <= RND_DAT;
85: l3_0[63:56] <= RND_DAT;
86: l3_1[7:0] <= RND_DAT;
87: l3_1[15:8] <= RND_DAT;
88: l3_1[23:16] <= RND_DAT;
89: l3_1[31:24] <= RND_DAT;
90: l3_1[39:32] <= RND_DAT;
91: l3_1[47:40] <= RND_DAT;
92: l3_1[55:48] <= RND_DAT;
93: l3_1[63:56] <= RND_DAT;
94: l3_1[64] <= RND_DAT[7];
95: l3_2[7:0] <= RND_DAT;
96: l3_2[15:8] <= RND_DAT;
97: l3_2[23:16] <= RND_DAT;
98: l3_2[31:24] <= RND_DAT;
99: l3_2[39:32] <= RND_DAT;
100: l3_2[47:40] <= RND_DAT;
101: l3_2[55:48] <= RND_DAT;
102: l3_2[63:56] <= RND_DAT;
103: l3_2[65:64] <= RND_DAT[1:0];
// L4
104: l4_0[7:0] <= RND_DAT;
105: l4_0[15:8] <= RND_DAT;
106: l4_0[23:16] <= RND_DAT;
107: l4_0[31:24] <= RND_DAT;
108: l4_0[39:32] <= RND_DAT;
109: l4_0[47:40] <= RND_DAT;
110: l4_0[55:48] <= RND_DAT;
111: l4_0[63:56] <= RND_DAT;
112: l4_1[7:0] <= RND_DAT;
113: l4_1[15:8] <= RND_DAT;
114: l4_1[23:16] <= RND_DAT;
115: l4_1[31:24] <= RND_DAT;
116: l4_1[39:32] <= RND_DAT;
117: l4_1[47:40] <= RND_DAT;
118: l4_1[55:48] <= RND_DAT;
119: l4_1[63:56] <= RND_DAT;
120: l4_1[64] <= RND_DAT[3];
121: l4_2[7:0] <= RND_DAT;
122: l4_2[15:8] <= RND_DAT;
123: l4_2[23:16] <= RND_DAT;
124: l4_2[31:24] <= RND_DAT;
125: l4_2[39:32] <= RND_DAT;
126: l4_2[47:40] <= RND_DAT;
127: l4_2[55:48] <= RND_DAT;
128: l4_2[63:56] <= RND_DAT;
129: l4_2[65:64] <= RND_DAT[5:4];
// L5
130: l5_0[7:0] <= RND_DAT;
131: l5_0[15:8] <= RND_DAT;
132: l5_0[23:16] <= RND_DAT;
133: l5_0[31:24] <= RND_DAT;
134: l5_0[39:32] <= RND_DAT;
135: l5_0[47:40] <= RND_DAT;
136: l5_0[55:48] <= RND_DAT;
137: l5_0[63:56] <= RND_DAT;
138: l5_1[7:0] <= RND_DAT;
139: l5_1[15:8] <= RND_DAT;
140: l5_1[23:16] <= RND_DAT;
141: l5_1[31:24] <= RND_DAT;
142: l5_1[39:32] <= RND_DAT;
143: l5_1[47:40] <= RND_DAT;
144: l5_1[55:48] <= RND_DAT;
145: l5_1[63:56] <= RND_DAT;
146: l5_1[64] <= RND_DAT[1];
147: l5_2[7:0] <= RND_DAT;
148: l5_2[15:8] <= RND_DAT;
149: l5_2[23:16] <= RND_DAT;
150: l5_2[31:24] <= RND_DAT;
151: l5_2[39:32] <= RND_DAT;
152: l5_2[47:40] <= RND_DAT;
153: l5_2[55:48] <= RND_DAT;
154: l5_2[63:56] <= RND_DAT;
155: l5_2[65:64] <= RND_DAT[7:6];
// L6
156: l6_0[7:0] <= RND_DAT;
157: l6_0[15:8] <= RND_DAT;
158: l6_0[23:16] <= RND_DAT;
159: l6_0[31:24] <= RND_DAT;
160: l6_0[39:32] <= RND_DAT;
161: l6_0[47:40] <= RND_DAT;
162: l6_0[55:48] <= RND_DAT;
163: l6_0[63:56] <= RND_DAT;
164: l6_1[7:0] <= RND_DAT;
165: l6_1[15:8] <= RND_DAT;
166: l6_1[23:16] <= RND_DAT;
167: l6_1[31:24] <= RND_DAT;
168: l6_1[39:32] <= RND_DAT;
169: l6_1[47:40] <= RND_DAT;
170: l6_1[55:48] <= RND_DAT;
171: l6_1[63:56] <= RND_DAT;
172: l6_1[64] <= RND_DAT[0];
173: l6_2[7:0] <= RND_DAT;
174: l6_2[15:8] <= RND_DAT;
175: l6_2[23:16] <= RND_DAT;
176: l6_2[31:24] <= RND_DAT;
177: l6_2[39:32] <= RND_DAT;
178: l6_2[47:40] <= RND_DAT;
179: l6_2[55:48] <= RND_DAT;
180: l6_2[63:56] <= RND_DAT;
181: l6_2[65:64] <= RND_DAT[3:2];
// L7
182: l7_0[7:0] <= RND_DAT;
183: l7_0[15:8] <= RND_DAT;
184: l7_0[23:16] <= RND_DAT;
185: l7_0[31:24] <= RND_DAT;
186: l7_0[39:32] <= RND_DAT;
187: l7_0[47:40] <= RND_DAT;
188: l7_0[55:48] <= RND_DAT;
189: l7_0[63:56] <= RND_DAT;
190: l7_1[7:0] <= RND_DAT;
191: l7_1[15:8] <= RND_DAT;
192: l7_1[23:16] <= RND_DAT;
193: l7_1[31:24] <= RND_DAT;
194: l7_1[39:32] <= RND_DAT;
195: l7_1[47:40] <= RND_DAT;
196: l7_1[55:48] <= RND_DAT;
197: l7_1[63:56] <= RND_DAT;
198: l7_1[64] <= RND_DAT[7];
199: l7_2[7:0] <= RND_DAT;
200: l7_2[15:8] <= RND_DAT;
201: l7_2[23:16] <= RND_DAT;
202: l7_2[31:24] <= RND_DAT;
203: l7_2[39:32] <= RND_DAT;
204: l7_2[47:40] <= RND_DAT;
205: l7_2[55:48] <= RND_DAT;
206: l7_2[63:56] <= RND_DAT;
207: l7_2[65:64] <= RND_DAT[1:0];
endcase
end
end else begin
rd_ok <= 0;
WE <= 0;
if (FULL == 0) begin
WE <= 1;
OUT <= { l7_0[0] ^ l7_1[0], l6_0[0] ^ l6_1[0], l5_0[0] ^ l5_1[0], l4_0[0] ^ l4_1[0], l3_0[0] ^ l3_1[0], l2_0[0] ^ l2_1[0], l1_0[0] ^ l1_1[0], l0_0[0] ^ l0_1[0]};
l7_2 <= (l7_2 >> 1) | ((l7_2[0] ^ l7_2[1] ^ l7_2[9] ^ l7_2[10]) << 65);
l6_2 <= (l6_2 >> 1) | ((l6_2[0] ^ l6_2[1] ^ l6_2[9] ^ l6_2[10]) << 65);
l5_2 <= (l5_2 >> 1) | ((l5_2[0] ^ l5_2[1] ^ l5_2[9] ^ l5_2[10]) << 65);
l4_2 <= (l4_2 >> 1) | ((l4_2[0] ^ l4_2[1] ^ l4_2[9] ^ l4_2[10]) << 65);
l3_2 <= (l3_2 >> 1) | ((l3_2[0] ^ l3_2[1] ^ l3_2[9] ^ l3_2[10]) << 65);
l2_2 <= (l2_2 >> 1) | ((l2_2[0] ^ l2_2[1] ^ l2_2[9] ^ l2_2[10]) << 65);
l1_2 <= (l1_2 >> 1) | ((l1_2[0] ^ l1_2[1] ^ l1_2[9] ^ l1_2[10]) << 65);
l0_2 <= (l0_2 >> 1) | ((l0_2[0] ^ l0_2[1] ^ l0_2[9] ^ l0_2[10]) << 65);
if (l7_2[0] == 0)
l7_0 <= (l7_0 >> 1) | ((l7_0[0] ^ l7_0[1] ^ l7_0[3] ^ l7_0[4]) << 63);
else
l7_1 <= (l7_1 >> 1) | ((l7_1[0] ^ l7_1[18]) << 64);
if (l6_2[0] == 0)
l6_0 <= (l6_0 >> 1) | ((l6_0[0] ^ l6_0[1] ^ l6_0[3] ^ l6_0[4]) << 63);
else
l6_1 <= (l6_1 >> 1) | ((l6_1[0] ^ l6_1[18]) << 64);
if (l5_2[0] == 0)
l5_0 <= (l5_0 >> 1) | ((l5_0[0] ^ l5_0[1] ^ l5_0[3] ^ l5_0[4]) << 63);
else
l5_1 <= (l5_1 >> 1) | ((l5_1[0] ^ l5_1[18]) << 64);
if (l4_2[0] == 0)
l4_0 <= (l4_0 >> 1) | ((l4_0[0] ^ l4_0[1] ^ l4_0[3] ^ l4_0[4]) << 63);
else
l4_1 <= (l4_1 >> 1) | ((l4_1[0] ^ l4_1[18]) << 64);
if (l3_2[0] == 0)
l3_0 <= (l3_0 >> 1) | ((l3_0[0] ^ l3_0[1] ^ l3_0[3] ^ l3_0[4]) << 63);
else
l3_1 <= (l3_1 >> 1) | ((l3_1[0] ^ l3_1[18]) << 64);
if (l2_2[0] == 0)
l2_0 <= (l2_0 >> 1) | ((l2_0[0] ^ l2_0[1] ^ l2_0[3] ^ l2_0[4]) << 63);
else
l2_1 <= (l2_1 >> 1) | ((l2_1[0] ^ l2_1[18]) << 64);
if (l1_2[0] == 0)
l1_0 <= (l1_0 >> 1) | ((l1_0[0] ^ l1_0[1] ^ l1_0[3] ^ l1_0[4]) << 63);
else
l1_1 <= (l1_1 >> 1) | ((l1_1[0] ^ l1_1[18]) << 64);
if (l0_2[0] == 0)
l0_0 <= (l0_0 >> 1) | ((l0_0[0] ^ l0_0[1] ^ l0_0[3] ^ l0_0[4]) << 63);
else
l0_1 <= (l0_1 >> 1) | ((l0_1[0] ^ l0_1[18]) << 64);
end else begin
if (rd == 1) begin
rd_ok <= 1;
upd <= upd + 1;
case (upd)
0: l0_0[9:2] <= RND_DAT;
1: l1_0[9:2] <= RND_DAT;
2: l2_0[9:2] <= RND_DAT;
3: l3_0[9:2] <= RND_DAT;
4: l4_0[9:2] <= RND_DAT;
5: l5_0[9:2] <= RND_DAT;
6: l6_0[9:2] <= RND_DAT;
7: l7_0[9:2] <= RND_DAT;
8: l0_1[9:2] <= RND_DAT;
9: l1_1[9:2] <= RND_DAT;
10: l2_1[9:2] <= RND_DAT;
11: l3_1[9:2] <= RND_DAT;
12: l4_1[9:2] <= RND_DAT;
13: l5_1[9:2] <= RND_DAT;
14: l6_1[9:2] <= RND_DAT;
15: l7_1[9:2] <= RND_DAT;
endcase
end
end
end
end
end
always @(posedge CLK)
begin
if (!RST) begin
RND_SHIFT <= 0;
start <= 0;
tog <= 0;
rd <= 0;
end else begin
RND_CNT <= !RND_CNT;
if (rd_ok)
rd <= 0;
if (RND_IN == 0) begin
tog <= 0;
end else if (tog == 0) begin
tog <= 1;
RND_SHIFT <= RND_SHIFT + 1;
RND_DAT[RND_SHIFT] <= RND_DAT[RND_SHIFT] ^ RND_CNT;
if (RND_SHIFT == 0) begin
if (start < 1024)
start <= start + 1;
else begin
rd <= 1;
end
end
end
end
end
endmodule