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: TROPICS :

REGISTERS

THE SHIFT REGISTER

The Shift Register is another type of sequential logic circuit that is used for the storage or transfer of data in the form of binary numbers. This sequential device loads the data present on its inputs and then moves or “shifts” it to its output once every clock cycle, hence the name “shift register”.

A shift register basically consists of several single bit “D-Type Data Latches”

The serial inputs determines what goes into the leftmost position during the shift.

The serial outputs is taken from the output of the rightmost flipflop

The clock is common to all flip-flop.

The Shift Register

Four-bit shift register

Two or three bit shift registers connected so that the contents of will be serially transferred into register Y.

Here , using D flip flops for each shift register.

Serial transfer between register:-

Operations in digital computers are usually done in parallel because that is a faster mode of operation.

Serial operations are slower because a data path operation takes several clock cycles.

The serial mode operations , we present the design of a serial adder.

Serial transfer operations:-

Serial transfer between register:-

The data transfer from one register to another using D-type.

Register X-consists of FFs X1 X2 X3. Register Y consists of FFs Y1 Y2 Y3. The transfer of the contents of the x register

into the y register is a synchronous transfer. it is also referred to as a parallel transfer.

Parallel data transfer

Parallel data transfer figure

In parallel transfer , all of the information is transferred a single commend pulse, no matter how many bits are being transferred.

In serial transfer , the complete transfer of N clock pulses.

Parallel transfer , then is obviously much factor then serial transfer using shift registers.

Parallel versus serial transfer:-

There two types: (1)synchronous data transfer (2) asynchronous data transfer

Data transfer type

Definition of synchronous and asynchronous :-

synchronous data transfer figure

asynchronous data transfer figure

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