Method and apparatus for increasing the memory read/write...

Details Method and apparatus for increasing the memory read/write... Method and apparatus for increasing the memory read/write...

2005-04-05

2005-04-05

Nguyen, Hiep T. (Department: 2187)

Electrical computers and digital processing systems: memory

Addressing combined with specific memory configuration or...

Addressing extended or expanded memory

Reexamination Certificate

active

06877062

ABSTRACT:
The present invention is a method and apparatus for increasing the memory read/write speed with special function registers (SFRs). This method comprises the steps of: (1) connecting additional external memory to the processor as expanded memory, (2) mapping the address of expanded memory to the unused SFR address in the processor, and (3) creating a control flag for switching the processor between the ICE mode or the normal mode. When in the ICE mode, the processor still uses extended instructions to perform read/write with expanded memory. Switching back to the normal mode, the processor can use the internal instructions to perform read/write with expanded memory. Using this method, built-in of an internal ICE and the slowing down of read/write during debugging due to the use of an external ICE can be eliminated.

REFERENCES:
patent: 5237699 (1993-08-01), Little et al.
patent: 5515540 (1996-05-01), Grider et al.
patent: 5734857 (1998-03-01), Gaubatz

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