Microprocessor interface apparatus having a boot address relocat

Details Microprocessor interface apparatus having a boot address relocat Microprocessor interface apparatus having a boot address relocat

1995-04-21

1996-07-23

Lee, Thomas C.

Boots, shoes, and leggings

3642285, 364230, 3642318, 3642383, 3649269, 36492798, 36494834, 395740, 395775, 395800, 395825, G06F 1300, G06F 1314

Patent

active

055398901

ABSTRACT:
A processor interface chip and a maintenance diagnostic chip are provided coupled with two microprocessors designed to be run in tandem. The processor interface chip includes logic for interfacing between the microprocessors and a main memory, logic for pipelining multiple microprocessor requests between the microprocessors and main memory, logic for prefetching data before a microprocessor issues a read request, logic for allowing a boot to occur from code anywhere in physical memory without regard to the microprocessors' fixed memory location for boot code, and logic for intelligently limiting the flow of interrupt information over a processor bus between the microprocessors and the processor interface chip. The maintenance diagnostic chip includes logic to halt either of the microprocessors if an error is detected, and read out the state of the microprocessors and a secondary cache attached to the microprocessors, before the state of the microprocessors at the time of the fault changes to a different state which might hide evidence of the cause of the fault.

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