Generation and diagnostic verification of complex timing cycles

Details Generation and diagnostic verification of complex timing cycles Generation and diagnostic verification of complex timing cycles

1989-05-18

1990-11-27

Smith, Jerry

Excavating

371 215, 371 61, G06F 1100

Patent

active

RE0334618

ABSTRACT:
A timing generator and verifier is provided in which a PROM stores the timing constants that are employed by the generator. An address counter, which is driven by a clock timer, cycles through an associated portion of the PROM to provide a sequence of output signals which represent timing for a particular mode. If a different mode is selected, the address counter selects a different sequence of output bits. During Normal mode the address counter operates on a cyclic basis driven by a fixed frequency free running master clock. In Verify mode the address counter is stepped by the Host computer. The outputs of the PROM are coupled through a buffer and logic section, where the outputs may be modified before being coupled to an adder which accumulates a checksum based on the outputs of all of the bits for a particular selected timing. The checksum provided by the adder is compared in a comparator with a stored checksum that indicates whether the correct operation of the complex timing cycle for the selected mode has been verified.

REFERENCES:
patent: 3806717 (1974-04-01), Gloeckler
patent: 3838264 (1974-09-01), Maker
patent: 3899665 (1975-08-01), Gaon
patent: 4084262 (1978-04-01), Lloyd
patent: 4319355 (1982-03-01), Mollier
patent: 4326290 (1982-04-01), Davis
patent: 4385385 (1983-05-01), Duplessis
patent: 4528665 (1985-07-01), Burns
patent: 4531213 (1985-07-01), Scheuneman

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