Jeroen said:
"Jonathan Kirwan" <
[email protected]> schreef in bericht
What about a 2 gate S/R flipflop? Or does logic with feedback not qualify as
combinatorial?
Jeroen
Combinational circuits are not clocked. You put some set of inputs into
it, and the circuit produces results (outputs) just as fast as it can.
Change the inputs, and the outputs follow, with a very small propagation
delay.
Sequential circuits are clocked. You control when the outputs will
change with a clock. You can change the inputs over and over, and it
won't make any difference to the outputs until the next clock pulse. At
that time, whatever the inputs were at that moment get reflected in the
outputs. Flip-flops are used to maintain the state of the outputs
between clock pulses. Flip-flop outputs are generally considered to be
the circuit outputs.
Sequential circuits generally include a combinational component or
section that provides the logic that determines what the outputs should
be after the next clock pulse. The combinational component usually has
external inputs and feedback inputs from the flip-flop outputs.
I hope you work on understanding this rather than copying it. Put in in
your own words.