Bidirectional serial test bus device adapted for control process

Details Bidirectional serial test bus device adapted for control process Bidirectional serial test bus device adapted for control process

1986-10-29

1989-10-31

Anderson, Lawrence E.

Boots, shoes, and leggings

3642392, 3642384, 364265, 371 162, 371 211, G06F 1130, G06F 1340, G11C 1900

Patent

active

048781681

ABSTRACT:
In a data processing system, particularly one implemented by a microprocessor, apparatus is provided for bypassing the main parallel information bus between the processor and main storage unit by a serial information bus for testing purposes. Serial test information is applied through the serial information bus to a storage control unit which interfaces the processor and storage unit. The control includes circuitry for converting the information from the serial bus into the parallel format of the data which is provided from the processor along the main parallel bus. The test information applied has the same commands and address structure as the information output from the central processor. As a result, when the serial test information is converted to parallel format, by the apparatus, it will be indistinguishable from parallel data applied directly from the processor along the parallel bus.

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