9/15/09 - L19 Sequential CircuitsCopyright 2009 - Joanne DeGroat, ECE, OSU1 Sequential Cirucits.

Sequential Cirucits

9/15/09 - L19 Sequential Circuits

Class 19 – Sequential Circuits Definitions Latches

Set-Reset – SR The D Latch

Material from section 5-1 and 5-2 of text

Combination Logic Logic that performs some transformation

operation on the inputs to produce outputs which are simple logic functions of the input.

The outputs reflect a function of the current values on the inputs.

There is not the capability to hold the value of the input.

Sequential Logic Logic elements capable of storing a logic

value. Sequential circuits are those circuits that

employ these elements.

Will be looking at the methodologies for sequential circuit design.

Basic structure The basic structure of a synchronous sequential

circuit is shown here.

Synchronous – One input is a clock and on the clock the next state becomes the present state of the system.

Sequential – The circuit transitions between states in a regular manner.

Definitions Inputs – All the outside logic signal inputs to the

circuit. Typically, the clock is not consider part of the signal inputs of the circuit.

Outputs – The logic signal outputs. Present State – the logic value of all the state variables

of the system. These are stored in the state memory. Next State – Given the present state and the current

values on the inputs, the next state represents the next logic state the circuit will transition to on the next clock.

The SR Latch The SR (Set-Reset) Latch

And its operation

The waveform A simulation waveform would look

something like this

Other implementations of the SR With NAND Gates

And adding a control input

The D Latch The most common element in today’s VLSI

Another implementation The implementation used in VLSI used

properties of the technology to reduce circuit elements and power consumption.

The VLSI implemention The VLSI implementation uses the

transmission gate. With control input of 1 the input = the output With control input of 0 it is an open circuit Used inverter feedback pair to store state. Transmission gate requires 2 transistors. Inverts require 2 transistors T-gate Latch – 8 or 10 transistors (depends on

availability of clk’9/15/09 - L19 Sequential Circuits

Contrast with the gate circuit The D latch circuit in the text would take 18

transistors in a VLSI circuit. This is contrasted to 8 or 10 transistors.

Class 19 assignment Covered sections 5-1 and 5-2 Problems for hand in

none Problems for practice

Reading for next class: sections 5-3

9/15/09 - L19 Sequential CircuitsCopyright 2009 - Joanne DeGroat, ECE, OSU1 Sequential Cirucits.

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