vocab Flashcards
sequential circuits
outputs of the circuit depend on the past behavior of the circuits as well as on the present values of the inputs
synchronous sequential circuit
sequential circuit with a clock signal controlling its operations
asynchronous sequential circuit
sequential circuit with a clock signal
state (Q)
stored values in the flip flop - determine behavior
Finite state machines
more formal name for sequential circuits
Combinational circuit
the values of the outputs are determined solely by the present values of its inputs.
Basic latch
a feedback connection of two NOR gates or two NAND gates, which can store one bit of information. It can be set to 1 using the S input and reset to 0 using the R input
Gated latch
is a basic latch that includes input gating and a control input signal. The latch retains its existing state when the control input is equal to 0. Its state may be changed when the control signal is equal to 1. In our discussion we referred to the control input as the clock. We considered two types of gated latches:
flip-flop
a storage element that can have its output state changed only on the edge of the controlling clock signal. If the state changes when the clock signal goes from 0 to 1, we say that the flip-flop is positive-edge triggered. If the state changes when the clock signal goes from 1 to 0, we say that the flip-flop is negative-edge triggered.
Gated SR latch
uses the S and R inputs to set the latch to 1 or reset it to 0,
Gated D latch
uses the D input to force the latch into a state that has the same logic value as the D input.
Register
a set of n flip-flops used to store n bits of information, such as an n-bit number,
Serial
transfer one at a time
parallel
transfer all at once
series-to-parallel converter
A circuit in which data can be loaded in series and then accessed in parallel
