Bi-directional co-processor interface

Details Bi-directional co-processor interface Bi-directional co-processor interface

1996-12-09

1998-02-03

Harrell, Robert B.

395379, 395561, G06F 9455

Patent

active

057154392

ABSTRACT:
A co-processor interface allows both a general processor and a relay ladder processor to make repeated calls to each other in the execution of subroutines. A register transfer instruction detected by the relay ladder processor triggers a suspension of the general processor. Return of control to the general processor is accomplished at the same time a register value is provided to the general processor that the general processor uses to reinitialize its program counter. For most single level transfers of control, a single transition instruction between the general processor to the relay ladder processor is sufficient to perform a call.

REFERENCES:
patent: 5093908 (1992-03-01), Beacon et al.
patent: 5159686 (1992-10-01), Chastain et al.
patent: 5430885 (1995-07-01), Kaneko et al.
patent: 5495588 (1996-02-01), Gibart et al.

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