Protection system for critical memory information

Details Protection system for critical memory information Protection system for critical memory information

1995-04-14

1997-09-16

Asta, Frank J.

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

364DIG1, 36518901, 711163, 711164, G06F 1216, G06F 1300

Patent

active

056689730

ABSTRACT:
A computer system for protecting memory comprising a processor having address outputs and executing a stored program, a memory having a control input, an address-decoder for providing a control signal to the control input of the memory in response to associated address outputs from the processor, and a window circuit. The window circuit comprises a range detector responsive to the address outputs for generating a range-detection signal indicative of an address from the processor being within a protected range, the protected range non-identical to the entirety of the space of addresses within the memory. Access to memory locations within the protected range is permitted only if a request signal is received from the processor. If the request signal is asserted for an unexpectedly long time an error condition is annunciated, for example the processor is reset.

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