Control system for a magnetic disk drive unit

Details Control system for a magnetic disk drive unit Control system for a magnetic disk drive unit

1984-09-10

1987-03-17

Williams, Archie E.

Boots, shoes, and leggings

G06F 1300, G11B 500

Patent

active

046512772

ABSTRACT:
A control system for a magnetic disk drive unit has a central processing unit (1), a disk controller (7) and a magnetic disk drive unit (8) controlled by the disk controller (7). A clock control circuit (12) has a clock switching circuit (15) and a clock detecting circuit (16) connected between the disk controller (7) and the magnetic disk drive unit (8). The disk controller (7) operates as a function of a clock signal (19) supplied thereto from the magnetic disk drive unit (8) through the clock control circuit (12). If it happens that for some reason the clock signal (19) is not supplied for more than a predetermined period, the clock detecting circuit (16) provides a detection signal (50), whereby the clock switching circuit (15) supplies a system clock signal (3) as a clock signal to the disk controller (7) instead of the clock signal from the magnetic disk drive unit (8). Accordingly, a clock signal is continually applied to the disk controller whereby a system fault is prevented in the control system.

REFERENCES:
patent: 3865981 (1975-02-01), Welch et al.
patent: 4037257 (1977-07-01), Chari
patent: 4549262 (1985-10-01), Chung et al.

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