System having main unit for shutting off clocks to memory upon c

Details System having main unit for shutting off clocks to memory upon c System having main unit for shutting off clocks to memory upon c

1993-01-04

1995-10-10

Lee, Thomas C.

Boots, shoes, and leggings

395550, 395750, 3642304, 3642409, 3642466, 364DIG1, G06F 1300

Patent

active

054577810

ABSTRACT:
The invention provides a method and apparatus for immediate control communications between supervising and main processor units. A method in accordance with the invention comprises the steps of: providing a communications memory means within a first clocked system (main system); providing a protocol means within the first clocked system (main system) for indicating various communications states; providing a scan interface, operatively coupled to the communications memory means and the protocol means, for interrogating the state of the protocol means and for scanning data into or out of the communications memory means within a first clocked system (main system); coupling an external second system (SVP) by way of the scan interface to the protocol means and the communications memory means; operating the protocol means so as to indicate to the external second system (SVP) when it is permissible for the second system (SVP) to scan data into or out of the communications memory means; and further operating the protocol means so as to indicate to the first clocked system (main system) whether and/or when the external second system (SVP) has scanned data into or out of the communications memory means.

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