Rewritable programmable logic array

Details Rewritable programmable logic array Rewritable programmable logic array

1979-07-05

1982-06-22

Shaw, Gareth D.

Boots, shoes, and leggings

307465, 364716, H03K 1920, G11C 1500

Patent

active

043366015

ABSTRACT:
A Rewritable Programmable Logic Array (R-PLA) which can alter dynamically logic functions during processing by loading a word pattern of bit personalities to realize the specific logic functions into memory cells of Current Mode Logic (CML) is constructed by splitting a conventional Random Access Memory (RAM) of CML into two parts (SEARCH and READ parts). Each cell structure of the new R-PLA is identified with that of the conventional RAM, differing from a complicated cell structure of a flip-flop and AND gate proposed in the past. SEARCH and READ parts of the new R-PLA can operate AND functions without using special AND gates in each cell in the READ mode and can enter WRITE data from a word direction in the WRITE mode. Each part of the R-PLA comprises a two-channel selector to select READ inputs or WRITE inputs, a CML memory array and sense-drive circuits. The selector and the sense-drive circuits are controlled by means of READ/WRITE control circuits.
The logic-in-memory for the AND functions on the array can be conducted by using one of multi-emitters of a transistor in each CML memory cell and an emitter of a reference transistor in each of the sense-drive circuits in the READ mode of the new R-PLA. The new READ/WRITE control circuits let a word pattern of the bit personalities load into the CML memory cells in the word direction.

REFERENCES:
patent: 3925684 (1975-12-01), Gaskill, Jr. et al.
patent: 3936812 (1976-02-01), Cox et al.
patent: 3974366 (1976-08-01), Hebenstreit
patent: 3987286 (1976-10-01), Muehldorf
patent: 3987287 (1976-10-01), Cox et al.
patent: 4084152 (1978-04-01), Long et al.
patent: 4124899 (1978-11-01), Birkner et al.
patent: 4195352 (1980-03-01), Tu et al.
patent: 4207556 (1980-06-01), Sugiyama et al.
patent: 4233667 (1980-11-01), Devine et al.
patent: 4237542 (1980-12-01), Cukier
patent: 4245324 (1982-01-01), Machol et al.
"Programmable Architectural Array", E. H. Stoops, IBM Tech. Disc. Bull., vol. 19, No. 12, May 1977, p. 4569.

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