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Patent
G - Physics
06
F
G06F 15/80 (2006.01) G06F 9/445 (2006.01) G06F 11/16 (2006.01) G06F 11/20 (2006.01) G06F 11/22 (2006.01) G06F 12/02 (2006.01) G06F 12/08 (2006.01)
Patent
CA 2127081
PROCESSOR INTERFACE CHIP FOR DUAL-MICROPROCESSOR PROCESSOR SYSTEM ABSTRACT OF THE DISCLOSURE 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.
Fu Peter
Grosz Martin Jiri
Rahman Mizanur Mohammed
Rector Russell Mark
Sabernick Fred C.
Smart & Biggar
Tandem Computers Incorporated
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