DMA-transferring stream data apparatus between a memory and port

Details DMA-transferring stream data apparatus between a memory and port DMA-transferring stream data apparatus between a memory and port

1997-10-20

1999-07-27

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710 24, 710 23, 711147, 711153, G06F 1310, G06F 13374, G06F 1338

Patent

active

059283394

ABSTRACT:
A data transfer apparatus for DMA-transferring stream data between a memory and each of n ports. The data transfer apparatus includes: an address counter for storing a start address of a memory area between which and a port a next piece of stream data is DMA-transferred; a data counter for storing a size of the next piece of stream data; n chain address counters each for storing an address of a memory area storing a certain command list; a port selecting unit for selecting one port; a command list transferring unit for, each time the port selecting unit selects a port, obtaining a command list according to a chain address counter corresponding to the selected port, transferring a start address in the command list to the address counter, transferring a size in the command list to the data counter, transferring the command to the port selecting unit, and updates the chain address counter; a stream data transferring unit for DMA-transferring a piece of stream data between the selected port and the memory area specified by the address counter. After the stream data transferring unit completes a DMA transfer, the port selecting unit, based on a predetermined order and the command, selects a new port or a current port. Each time the command list transferring unit transfers the size to the data counter, the stream data transferring unit DMA-transfers a piece of stream data between the selected port and the memory area specified by the address counter.

REFERENCES:
patent: 4896256 (1990-01-01), Roberts
patent: 4896266 (1990-01-01), Klashka
patent: 4941201 (1990-07-01), Davis
patent: 5008760 (1991-04-01), Shimizu
patent: 5438665 (1995-08-01), Taniai
patent: 5450549 (1995-09-01), Casparian
patent: 5508940 (1996-04-01), Rossmere
patent: 5583561 (1996-12-01), Baker
patent: 5655112 (1997-08-01), MacInnis
patent: 5805821 (1998-09-01), Saxena
patent: 5848293 (1998-12-01), Gentry
patent: 5860022 (1999-01-01), Kondou
patent: 5862407 (1999-01-01), Sriti
patent: 5867686 (1999-02-01), Conner

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