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SubClockDyn.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 23:25:30 03/01/2014
// Design Name:
// Module Name: SubClock
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module SubClockDyn(
input CLK,
input [25:0] Freq,
output OUTCLK
);
reg [25:0] wait1, div;
reg CLK_;
assign OUTCLK = CLK_; // output clock
// clear out variables
initial begin
wait1 = 0;
CLK_ = 0;
div = 0;
end
always @(posedge CLK) begin
// wait until clock hits half of the counted time.
wait1 <= wait1+1; // count up 1
case(Freq) // dividers >> 2
1: div <= 25000000;
2: div <= 12500000;
3: div <= 8333333;
4: div <= 6250000;
5: div <= 5000000;
6: div <= 4166667;
7: div <= 3571429;
8: div <= 3125000;
9: div <= 2777778;
10: div <= 2500000;
11: div <= 2272727;
12: div <= 2083333;
13: div <= 1923077;
14: div <= 1785714;
15: div <= 1666667;
16: div <= 1562500;
17: div <= 1470588;
18: div <= 1388889;
19: div <= 1315789;
20: div <= 1250000;
21: div <= 1190476;
22: div <= 1136364;
23: div <= 1086957;
24: div <= 1041667;
25: div <= 1000000;
26: div <= 961538;
27: div <= 925926;
28: div <= 892857;
29: div <= 862069;
30: div <= 833333;
31: div <= 806452;
32: div <= 781250;
33: div <= 757576;
34: div <= 735294;
35: div <= 714286;
36: div <= 694444;
37: div <= 675676;
38: div <= 657895;
39: div <= 641026;
40: div <= 625000;
41: div <= 609756;
42: div <= 595238;
43: div <= 581395;
44: div <= 568182;
45: div <= 555556;
46: div <= 543478;
47: div <= 531915;
48: div <= 520833;
49: div <= 510204;
50: div <= 500000;
51: div <= 490196;
52: div <= 480769;
53: div <= 471698;
54: div <= 462963;
55: div <= 454545;
56: div <= 446429;
57: div <= 438596;
58: div <= 431034;
59: div <= 423729;
60: div <= 416667;
61: div <= 409836;
62: div <= 403226;
63: div <= 396825;
64: div <= 390625;
65: div <= 384615;
66: div <= 378788;
67: div <= 373134;
68: div <= 367647;
69: div <= 362319;
70: div <= 357143;
71: div <= 352113;
72: div <= 347222;
73: div <= 342466;
74: div <= 337838;
75: div <= 333333;
76: div <= 328947;
77: div <= 324675;
78: div <= 320513;
79: div <= 316456;
80: div <= 312500;
81: div <= 308642;
82: div <= 304878;
83: div <= 301205;
84: div <= 297619;
85: div <= 294118;
86: div <= 290698;
87: div <= 287356;
88: div <= 284091;
89: div <= 280899;
90: div <= 277778;
91: div <= 274725;
92: div <= 271739;
93: div <= 268817;
94: div <= 265957;
95: div <= 263158;
96: div <= 260417;
97: div <= 257732;
98: div <= 255102;
99: div <= 252525;
100: div <= 250000;
101: div <= 247525;
102: div <= 245098;
103: div <= 242718;
104: div <= 240385;
105: div <= 238095;
106: div <= 235849;
107: div <= 233645;
108: div <= 231481;
109: div <= 229358;
110: div <= 227273;
111: div <= 225225;
112: div <= 223214;
113: div <= 221239;
114: div <= 219298;
115: div <= 217391;
116: div <= 215517;
117: div <= 213675;
118: div <= 211864;
119: div <= 210084;
120: div <= 208333;
121: div <= 206612;
122: div <= 204918;
123: div <= 203252;
124: div <= 201613;
125: div <= 200000;
126: div <= 198413;
127: div <= 196850;
128: div <= 195313;
129: div <= 193798;
130: div <= 192308;
131: div <= 190840;
132: div <= 189394;
133: div <= 187970;
134: div <= 186567;
135: div <= 185185;
136: div <= 183824;
137: div <= 182482;
138: div <= 181159;
139: div <= 179856;
140: div <= 178571;
141: div <= 177305;
142: div <= 176056;
143: div <= 174825;
144: div <= 173611;
145: div <= 172414;
146: div <= 171233;
147: div <= 170068;
148: div <= 168919;
149: div <= 167785;
150: div <= 166667;
151: div <= 165563;
152: div <= 164474;
153: div <= 163399;
154: div <= 162338;
155: div <= 161290;
156: div <= 160256;
157: div <= 159236;
158: div <= 158228;
159: div <= 157233;
160: div <= 156250;
161: div <= 155280;
162: div <= 154321;
163: div <= 153374;
164: div <= 152439;
165: div <= 151515;
166: div <= 150602;
167: div <= 149701;
168: div <= 148810;
169: div <= 147929;
170: div <= 147059;
171: div <= 146199;
172: div <= 145349;
173: div <= 144509;
174: div <= 143678;
175: div <= 142857;
176: div <= 142045;
177: div <= 141243;
178: div <= 140449;
179: div <= 139665;
180: div <= 138889;
181: div <= 138122;
182: div <= 137363;
183: div <= 136612;
184: div <= 135870;
185: div <= 135135;
186: div <= 134409;
187: div <= 133690;
188: div <= 132979;
189: div <= 132275;
190: div <= 131579;
191: div <= 130890;
192: div <= 130208;
193: div <= 129534;
194: div <= 128866;
195: div <= 128205;
196: div <= 127551;
197: div <= 126904;
198: div <= 126263;
199: div <= 125628;
200: div <= 125000;
201: div <= 124378;
202: div <= 123762;
203: div <= 123153;
204: div <= 122549;
205: div <= 121951;
206: div <= 121359;
207: div <= 120773;
208: div <= 120192;
209: div <= 119617;
210: div <= 119048;
211: div <= 118483;
212: div <= 117925;
213: div <= 117371;
214: div <= 116822;
215: div <= 116279;
216: div <= 115741;
217: div <= 115207;
218: div <= 114679;
219: div <= 114155;
220: div <= 113636;
221: div <= 113122;
222: div <= 112613;
223: div <= 112108;
224: div <= 111607;
225: div <= 111111;
226: div <= 110619;
227: div <= 110132;
228: div <= 109649;
229: div <= 109170;
230: div <= 108696;
231: div <= 108225;
232: div <= 107759;
233: div <= 107296;
234: div <= 106838;
235: div <= 106383;
236: div <= 105932;
237: div <= 105485;
238: div <= 105042;
239: div <= 104603;
240: div <= 104167;
241: div <= 103734;
242: div <= 103306;
243: div <= 102881;
244: div <= 102459;
245: div <= 102041;
246: div <= 101626;
247: div <= 101215;
248: div <= 100806;
249: div <= 100402;
250: div <= 100000;
251: div <= 99602;
252: div <= 99206;
253: div <= 98814;
254: div <= 98425;
255: div <= 98039;
256: div <= 97656;
257: div <= 97276;
258: div <= 96899;
259: div <= 96525;
260: div <= 96154;
261: div <= 95785;
262: div <= 95420;
263: div <= 95057;
264: div <= 94697;
265: div <= 94340;
266: div <= 93985;
267: div <= 93633;
268: div <= 93284;
269: div <= 92937;
270: div <= 92593;
271: div <= 92251;
272: div <= 91912;
273: div <= 91575;
274: div <= 91241;
275: div <= 90909;
276: div <= 90580;
277: div <= 90253;
278: div <= 89928;
279: div <= 89606;
280: div <= 89286;
281: div <= 88968;
282: div <= 88652;
283: div <= 88339;
284: div <= 88028;
285: div <= 87719;
286: div <= 87413;
287: div <= 87108;
288: div <= 86806;
289: div <= 86505;
290: div <= 86207;
291: div <= 85911;
292: div <= 85616;
293: div <= 85324;
294: div <= 85034;
295: div <= 84746;
296: div <= 84459;
297: div <= 84175;
298: div <= 83893;
299: div <= 83612;
300: div <= 83333;
301: div <= 83056;
302: div <= 82781;
303: div <= 82508;
304: div <= 82237;
305: div <= 81967;
306: div <= 81699;
307: div <= 81433;
308: div <= 81169;
309: div <= 80906;
310: div <= 80645;
311: div <= 80386;
312: div <= 80128;
313: div <= 79872;
314: div <= 79618;
315: div <= 79365;
316: div <= 79114;
317: div <= 78864;
318: div <= 78616;
319: div <= 78370;
320: div <= 78125;
512: div <= 48828;
1024: div <= 24414;
1200: div <= 20833;
2048: div <= 12207;
2400: div <= 10417;
4096: div <= 6104;
5120: div <= 4883;
8192: div <= 3052;
9600: div <= 2604;
16384: div <= 1526;
19200: div <= 1302;
32768: div <= 763;
38400: div <= 651;
57600: div <= 434;
65536: div <= 381;
115200: div <= 217;
131072: div <= 191;
250000: div <= 100;
262144: div <= 95;
500000: div <= 50;
524288: div <= 48;
1048576: div <= 24;
2097152: div <= 12;
4194304: div <= 6;
8388608: div <= 3;
16777216: div <= 1;
default: div <= 25000000;
endcase
if(wait1 >= div) begin // Divider is divided by 2
wait1 <= 0; // reset clock
CLK_ <= ~CLK_;
end
end
endmodule