Secondary storage facility employing serial communications betwe

Details Secondary storage facility employing serial communications betwe Secondary storage facility employing serial communications betwe

1987-03-09

1989-03-07

Eng, David Y.

Boots, shoes, and leggings

G06F 1300

Patent

active

048112798

ABSTRACT:
A radial bus for use in a secondary storage subsystem, between a mass storage drive and controller. The bus has four unidirectional bit-serial channels, two for carrying signals from drive to controllers. One channel carries real-time drive state information to the controller; another carries real-time controller state information to the drive. The state information is a sequence of multiplexed bits sent in continuous repetition. Most status variables are represented as a single bit in a specific place in the sequence; the set of status variables defining drive state or controller state, as the case may be, is thus provided by a sequence of bits. When such a bit changes state, a potential change of status has occurred; the change is required to persist some number of repetition of the sequence before the state change is recognized, to avoid spuriously signalling a state change.

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