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Shift Register as a Means of Personalization

IP.com Disclosure Number: IPCOM000082421D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Craig, WJ: AUTHOR

Abstract

Described are serially arranged shift registers, which can act as serial-to-parallel converters for simultaneously loading an entire array of cells. Thus a large array of nonvolatile devices can be used and written into in a very short period of time, without substantially increasing the number of input pads.

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Shift Register as a Means of Personalization

Described are serially arranged shift registers, which can act as serial-to- parallel converters for simultaneously loading an entire array of cells. Thus a large array of nonvolatile devices can be used and written into in a very short period of time, without substantially increasing the number of input pads.

In nonvolatile array logic chips there is limited access to the cells of the array because the inputs do not select a unique cell location, instead the inputs are used in parallel across a portion of the nonvolatile array. Such limited access to the cell significantly increases the time and complexity of personalizing the array.

To solve this problem of limited access to the array, shift registers 10 and 11 are used to control the write driver circuits 12 and 13 and hence control personalization of the array 14. As shown, the array 14 is coupled through write driver circuits 12 and 13 to serially arranged shift registers 10 and 11.

Shift register 10 has a single clock input 15 and a single data input 16 and has an output 17 to write driver 12, and outputs 19 and 20 directly coupled to shift register 11 which has outputs 21, 22, 23, 24, and 25 to driver 13. Because of the serial arrangement of the shift registers 10 and 11 they act as serial-to- parallel converters, allowing an entire selected word line 24 to be written at a single time. Shift register 10 takes serial data applied to data input 16 and feeds it to...