Digital integrated circuit

Details Digital integrated circuit Digital integrated circuit

1986-10-14

1988-03-22

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

377 70, 377 77, 371 25, 307481, 307279, 324 73R, G11C 2900, G11C 1928

Patent

active

047334053

ABSTRACT:
A digital integrated circuit incorporates a plurality of multi-port flip-flop circuits which are interconnected by a plurality of gate circuits. A separate source of clock pulses is provided for each of the ports of the multi-port flip-flop circuits, and each clock pulse source is selectively effective to cause the multi-port flip-flop circuits to perform independent functions. During operation under one source of clock pulses, the flip-flops perform their ordinary function as D type flip-flops. During operation under another source of clock pulses, the flip-flops function as one or more shift registers in order to set the flip-flops to a predefined initial state in accordance with serial input data, and/or to provide serial output data in response to the state of the flip-flops following a preceding operation. When a further source of clock pulses is effective, a plurality of flip-flops may be connected to function as a random number generator or as a signature generator so as to perform repetitive operations such as cycling the address inputs of a ROM and providing output signals corresponding to the operation of the ROM.

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patent: 4590601 (1986-05-01), Beeman
patent: 4597042 (1986-06-01), d'Angeac et al.
patent: 4601033 (1986-07-01), Whelan
patent: 4611183 (1986-09-01), Piosenka et al.
patent: 4613773 (1986-09-01), Koike

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