Interface and loopback circuit for character based computer peri

Details Interface and loopback circuit for character based computer peri Interface and loopback circuit for character based computer peri

1994-10-04

1996-12-17

Beausoliel, Jr., Robert W.

Excavating

371 201, G06F 1100

Patent

active

055861237

ABSTRACT:
An interface circuit for keyboards and other serial peripheral devices that adds loopback capability through multiplexers in the clock and data lines, and also provides a receiver clock delayed from the transmitter clock to avoid race conditions between the data and clock lines. The circuit also provides a means of forcing a zero bit onto the data line after a byte is sent, to indicate to the transmitter that the byte was received by the receiver. The circuit also provides a way to hold off the transmitter, to simulate the normal keyboard action of holding off transmitter while it processes the character just sent.

REFERENCES:
patent: 5265089 (1993-11-01), Yonehara
patent: 5289474 (1994-02-01), Purcell et al.
patent: 5442776 (1995-08-01), Masleid et al.
patent: 5448588 (1995-09-01), Saito
IBM Technical Manual, "Keyboard ans Auxiliary Device Controller", IBM Corp. 1990.
Micro Cornucopia, Issue 52, Mar.-Apr. 1990, p. 40.

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