DMA transfer method

Details DMA transfer method DMA transfer method

2005-02-15

2005-02-15

Fleming, Fritz (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C710S056000, C710S062000, C710S074000

Reexamination Certificate

active

06857031

ABSTRACT:
A DMA transfer device has stream inputting means for receiving an encoded first stream;first stream storing means for storing the first stream;a main storage unit which stores the stream of said first stream storing means;first DMA transfer executing means for executing a first DMA transfer from said first stream storing means to said main storage unit;first DMA transfer controlling means for controlling said first DMA transfer executing means on the basis of an amount of data which are stored in said first stream storing means or a free capacity;a processing unit which produces a second stream from the first stream that is read out from said main storage unit, and which writes the second stream into said main storage unit;second stream storing means for storing the second stream of said main storage unit;second DMA transfer executing means for executing a second DMA transfer from said main storage unit to said second stream storing means; andsecond DMA transfer controlling means for controlling said second DMA transfer executing means on the basis of an amount of data which are stored in said second stream storing means or a free capacity.

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