Virtual Labs Ac in Labs Cse10 Reg Cnt Design HTML

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Theory Objective Procedure Experiment Quizes Further Reading

Virtual Lab - IIT KharagpurComputer Organisation and Architecture.

Design of Registers and Counters :

In a sequential circuit the present output is determined by both the present input and the past output. In

order to receive the past output some kind of memory element can be used. The memory element commonly

used in the sequential circuits are time-delay devices. The block diagram of the sequential circuit-

A circuit w ith flip-flops is considered a sequential circuit even in the absence of combinational logic. Circuits

that include flip-flops are usually classif ied by the function they perform. Tw o such c ircuits are registers

and counters:

1. Register is a group of flip-flops. Its basic f unction is to hold information w ithin a digital system so

as to make it available to the logic units during the computing process.

Manual for Using Simulator

L I ST OF EXPERIMENT S

Ripple Carry Adder

Carry-look-ahead adder

Registers and Counters

Wallace Tree Adder

Combinational Multipliers

Arithmetic Logic Unit

Memory Design

Associative cache Design

Direct Mapped Cache Design

OTHERS

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2. Counteris essentially a register that goes through a predetermined sequence of states.

There are various different kind ofFlip-Flops . Some of the common f lip-flops are: R-S Flip-Flop, D Flip-Flop,

J-K Flip-Flop, T Flip-Flop. The block diagram of dif ferent flip-f lops are show n here -

RS flipflop If R is high then reset state occurs and w hen S=1 set state.the both cannot be highsimultaneouly. this input combination is avoided.

JK flipflop If J and K are both low then no change occurs. If J and K are both high at the clock edge then

the output w ill toggle from one state to the other.

D flipflop The D f lip-flop tracks the input, making transitions w ith match those of the input D. It is used asdata store.

Tflipflop The T or "toggle" flip-flop changes its output on each clock edge,

T ypes of Registers:

4-bit Serial-in Serial-out

4-bit Serial-in Parallel-out

4-bit Parallel-in Serial-out

4-bit Parallel-in Parallel-out

T ypes of Counters:

Pre-requisite Softw ares

Objectives

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4-bit Synchronous Binary Counter

4-bit Synchronous Ring Counter

4-bit Synchronous Johnson Counter

Design Issues :

The four different types of flip-flops are supplied here. One can easily build any register or counter usingthose flip-flop and different logic gates. But the clock input is under development, so it is not possible now

to build any register or counter completely.

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Virtual Labs Ac in Labs Cse10 Reg Cnt Design HTML