LSI microprocessor chip with backward pin compatibility

Details LSI microprocessor chip with backward pin compatibility LSI microprocessor chip with backward pin compatibility

1984-04-04

1987-03-31

Williams, Jr., Archie E.

Boots, shoes, and leggings

371 11, G06F 100, G06F 1300

Patent

active

046547894

ABSTRACT:
A chip implemented in newer technology is designed to include new functionality. The chip includes compatibility circuits which connect to a pin which is unused in the chip it replaces in an existing computer system. The compatibility circuits connect to those internal parts of the new chip that contain the newly added or altered functionality. The new chip is installed in the existing computer system just as the prior chip. When so installed, the compatibility circuits enable the new chip to operate in the same manner as the replaced chip but at higher speed and with improved performance. When the new chip is installed in the system for which it was designed, the compatibility circuits enable the chip to operate with the new functionality at the same higher speed and improved performance as compared to the replaced chip.

REFERENCES:
patent: 2706222 (1955-04-01), Bjornson
patent: 4145760 (1979-03-01), Ward et al.
patent: 4148099 (1979-04-01), Lauffer et al.
patent: 4159516 (1979-06-01), Henrion et al.
patent: 4159541 (1979-06-01), Ward et al.
patent: 4163289 (1979-07-01), Schmidt
patent: 4168537 (1979-09-01), Uchida
patent: 4198698 (1980-04-01), Ong
patent: 4250407 (1981-02-01), Dorey et al.
patent: 4334268 (1982-06-01), Boney et al.
patent: 4375665 (1983-03-01), Schmidt
patent: 4441154 (1984-04-01), McDonough et al.
patent: 4443864 (1984-04-01), McElroy
patent: 4500956 (1985-02-01), Leininger
"A Smart Dynamic Memory Needs Only Four Pins" by Don Lauffer, Electronics, Oct. 11, 1979, pp. 144-150.

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