1. Sequential Design Example
A single input (X) single output (Z) synchronous sequential circuit will give a 1 output when the input sequence starting from reset up to present time includes odd number of 1s, otherwise the circuit will give a 0 output.
Design a serial leading 1’s detector. Input X is an arbitrary length binary number presented starting from MSB. Input Y becomes 1 for one clock cycle to indicate the LSB of input X. Output Z is a 0 as long as X=0, it gives 1 for the first time when X=1, and later it stays as 0 for all other bits of X.
KU College of Engineering
Elec 204: Digital Systems Design