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Random Access Memory Performing a Shift Register Function

IP.com Disclosure Number: IPCOM000082165D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Riso, V: AUTHOR

Abstract

In conventional digital filters, shift registers are used. A big step toward integration may be achieved by using a random-access memory to perform this shift register function. This random-access memory provides a lower power dissipation per bit, but a special configuration of the memory addressing is needed to perform the shift register operation. (Image Omitted)

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Random Access Memory Performing a Shift Register Function

In conventional digital filters, shift registers are used.

A big step toward integration may be achieved by using a random-access memory to perform this shift register function. This random-access memory provides a lower power dissipation per bit, but a special configuration of the memory addressing is needed to perform the shift register operation.

(Image Omitted)

The random-access memory accessing is arranged as shown on the figure, to provide twelve taps out of the shift register. The input bits belonging to the input word (x(22) on the figure) is fed to both input line E(11) and output line S12; while outputs are both provided on output lines S11, S10 ... S2, S1 and recirculated on inputs E(1) to E(10).

In fact, no data circulation is needed within the random-access memory. The write and read latches are assigned by circulating the memory addressing.

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