Apparatus guaranteeing that a controller in a disk drive system

Details Apparatus guaranteeing that a controller in a disk drive system Apparatus guaranteeing that a controller in a disk drive system

1986-04-29

1989-04-25

Williams, Jr., Archie E.

Boots, shoes, and leggings

360 51, 369 59, 371 10, G06F 1110, G06F 1312, G06F 306

Patent

active

048254037

ABSTRACT:
An apparatus provides a sequence detected signal indicating that a synchronization sequence occurring at regular intervals in a stream of data has occurred or should have occurred. The apparatus includes logic for detecting the synchronization sequence, logic responsive to the detection logic for producing the sequence detected signal when the detection logic detects the sequence, and logic for producing the sequence detected signal at a fixed time after the synchronization sequence should have occurred. If the synchronization sequence did occur, the apparatus thus produces two sequence detected signals; however, the device receiving the sequence detected signal responds to the first sequence detected signal and ignores the second. If the synchronization sequence did not occur, the device receiving the sequence detected signal responds to the sequence detected signal produced by the logic responsive to the timing apparatus. The apparatus thus guarantees that the device receiving the sequence detected signal will always receive such a signal.

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"Missing Address Mark Detector for Disk Files", IBM Technical Disclosure Bulletin, vol. 14, No. 8, Jan. 1972, King, R. W. et al., p. 2263.

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