Patch memory system for a ROM-based processor

Details Patch memory system for a ROM-based processor Patch memory system for a ROM-based processor

2006-05-02

2006-05-02

Nguyen, T. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C712S226000, C712S233000, C712S234000

Reexamination Certificate

active

07039776

ABSTRACT:
An embedded ROM-based processor system including a processor, system memory, a programmable memory, a data selector and a patch controller. The system memory includes a read-only memory (ROM). The programmable memory stores patch information including patch code and one or more patch vectors. Each patch vector includes a break-out address from the ROM and a patch-in address to a corresponding location within the patch code. The data selector has an input coupled to the system memory and an output coupled to the processor. The patch controller is operative to compare an address provided by the processor with each break-out address to determine a breakout condition, and to control the selector to transfer the processor to a corresponding location within the patch code in response to a break-out condition. The programmable memory may be volatile memory, where the patch information is loaded from an external memory during initialization.

REFERENCES:
patent: 5790860 (1998-08-01), Wetmore et al.
patent: 5802549 (1998-09-01), Goyal et al.
patent: 6260157 (2001-07-01), Schurecht et al.

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