Subject: Logic Design

Topic: Sequential Logic Design

Difficulty: Hard

Modulus Counters, or simply MOD counters, are defined based on the number of states that the counter will sequence through before returning back to its original value. For example, a 2-bit counter that counts from 002 to 112 in binary, that is 0 to 3 in decimal, has a modulus value of 4 ( 00 → 1 → 10 → 11, and return back to 00 ) so would therefore be called a modulo-4, or mod-4, counter. Note also that it has taken four clock pulses to get from 00 to 11.