Sequential Logic Design

As we have seen a bit earlier in the Combinational Logic Design. The outputs of sequential logic depend on both current and prior input values. Hence, sequential has memory. This memory is called the state of the logic.

What does memory exactly mean?

TLDR, after we learn the D Flip-flop, we will see that memory means it can remember what the previous state was until there is a clock edge.

Sequential logic might explicitly remember certain previous inputs, or it might distill the prior inputs into a smaller amount of information called the state of the system. The state of a digital sequential circuit is a set of bits called state variables that contain all the information about the past necessary to explain the future behavior of the state.

We will begin by studying latches and flip-flops, which are simple sequential circuits that store one bit of state.