Example: Modulo-4 Counter
Example: Modulo-4 Counter
Example: Modulo-4 Counter
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A-63<br />
RESET<br />
r(t)<br />
0<br />
0<br />
0<br />
0<br />
1<br />
1<br />
1<br />
1<br />
Appendix A: Digital Logic<br />
Truth Table for Mod-4 <strong>Counter</strong><br />
s 1(t) s 0(t)<br />
0<br />
0<br />
1<br />
1<br />
0<br />
0<br />
1<br />
1<br />
0<br />
1<br />
0<br />
1<br />
0<br />
1<br />
0<br />
1<br />
s 1s 0(t+1)<br />
01<br />
10<br />
11<br />
00<br />
00<br />
00<br />
00<br />
00<br />
q 1q 0(t+1)<br />
01<br />
10<br />
11<br />
00<br />
00<br />
00<br />
00<br />
00<br />
s 0(t+1) = r(t)s 1(t)s 0(t) + r(t)s 1(t)s 0(t)<br />
s 1(t+1) = r(t)s 1(t)s 0(t) + r(t)s 1(t)s 0(t)<br />
q 0(t+1) = r(t)s 1(t)s 0(t) + r(t)s 1(t)s 0(t)<br />
q 1(t+1) = r(t)s 1(t)s 0(t) + r(t)s 1(t)s 0(t)<br />
Principles of Computer Architecture by M. Murdocca and V. Heuring © 1999 M. Murdocca and V. Heuring
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