Input/output buffer and method for invalidating transferred data

Details Input/output buffer and method for invalidating transferred data Input/output buffer and method for invalidating transferred data

1996-12-05

2000-06-20

Maung, Zarni

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710 24, 710 22, 710 55, G06F 1328

Patent

active

060789719

ABSTRACT:
An input/output (I/O) buffer has a block-end detector which detects that an access has reached the last word in a block of the I/O buffer. If the block-end detector detects the last word of the block, then the block is invalidated. The I/O buffer also has a direct-memory-access-end detector which detects that an access has reached the last word in a direct-memory-access (DMA) transfer. If the DMA-end detector detects the last word of the DMA transfer, then the block is invalidated. The I/O buffer may also have a configuration memory which stores configuration information concerning whether a DMA controller accesses the input/output buffer instead of a storage. If the configuration information indicates that the DMA controller does not access the input/output buffer, then data from the storage are bypassed to the DMA controller.

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Copy of Japanese Office Action with translation.

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