Method and apparatus for accessing peripheral storages with asyc

Details Method and apparatus for accessing peripheral storages with asyc Method and apparatus for accessing peripheral storages with asyc

1989-07-07

1993-08-10

Lee, Thomas C.

Boots, shoes, and leggings

3642363, 3642378, 3642379, 3642383, 364239, 36423951, 3642399, 364242, 36424291, 36424292, 3642514, 3642525, 364259, 3642593, 3642676, 3642686, 3642691, 364269, 3642694, 364DIG1, 364DIG2, 371 36, G06F 305, G06F 306, G06F 1118, G06F 1314

Patent

active

052356833

ABSTRACT:
Apparatus for duplicating data, especially in the form of multiple magnetic disks and tapes, includes a host processor (1) which functions as a data source and a plurality of peripheral storage devices (21 . . . 2n) which function as data receivers, connected to one another via a data bus and a control bus. In order to be able to transmit the data information in parallel, the storage devices are synchronized by means of a signal sequence comprising individual request signals (for example dREQ) from all of the storage devices, and acknowledgement signals (for example ACK) from the host processor, executed on a byte-by-byte basis, such that the slowest of the active storage devices determines the execution speed. The host processor can activate or de-activate all or only individual storage devices at any time in any arbitrary sub-combination.

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SCSI-2 Draft Proposed American National Standard, pp. A-1, A-2, 1--1, 1-2, Mar. 19, 1990.

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