Circuit for controlling generation of an acknowledge signal and

Details Circuit for controlling generation of an acknowledge signal and Circuit for controlling generation of an acknowledge signal and

1990-08-10

1995-02-07

Richardson, Robert L.

Boots, shoes, and leggings

395550, 364DIG2, 36492792, 364930, G06F 312

Patent

active

053882164

ABSTRACT:
There is disclosed a circuit for controlling the generation of a busy signal and an acknowledge signal properly to allow fast, accurate data communication between communication systems. The circuit includes: a Centronics interface cable for generating a strobe signal upon receiving data from a data communication device; a busy signal generator coupled to the Centronics interface cable, for generating a busy signal in response to the strobe signal and a busy signal generation control signal; a CPU coupled so as to control the entire system, for generating a received data processing completion signal in response to the busy signal; an acknowledge signal generator coupled to the Centronics interface cable, for generating an acknowledge signal in response to the state of the received data processing completion signal; and a counter for counting a predetermined clock responsive to the state of the received data processing completion signal to provide the acknowledge signal generator with an acknowledge signal generation control signal and to provide the busy signal generator with the busy signal.

REFERENCES:
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patent: 5019966 (1991-05-01), Saito et al.
patent: 5040109 (1991-08-01), Bowhill et al.
Comer, D. T., "Digital Logic & State Machine Design", New York, 1982, pp. 202-206.
"Alps P2000G/P2100G Printer User's Manual", Alps America 1986 pp. 4-2, 4-3, 4-4.
Wendell Watson, "The Printer Interface", DG Review, Apr. 1988 Abstract & 4 pages of full test printout.
R. L. L. Hu, "Parallel to Serial Interface-Interfacing a Centronics Output to an RS323 Serial Printer", Radio-Electronics, May 1985 Computer Digest pp. 8-9.

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