Data transfer control device, image processing device, and...

Details Data transfer control device, image processing device, and... Data transfer control device, image processing device, and...

2006-02-24

2010-02-02

Tsai, Henry W. H. (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C710S053000, C345S539000

Reexamination Certificate

active

07657673

ABSTRACT:
A data transfer control device, which transfers a large capacity of data speedily and sequentially, has three buffers that are used as a WR (write) buffer, an intermediate buffer, and an RD (read) buffer. To send data sequentially, the data transfer control device switches-over the buffers in one of the following three ways (A), (B), and (C), using determination flags indicating whether the buffers store effective data (data not yet referenced). A buffer control device switches-over (A) the WR buffer and RD buffer if a WR buffer effective flag33is on and an intermediate buffer effective flag34and an RD buffer effective flag35are off, (B) the WR buffer and the intermediate buffer if the WR buffer effective flag33and the RD buffer effective flag35are on and the intermediate buffer effective flag34is off, and (C) the intermediate buffer and the RD buffer if the intermediate buffer effective flag34is on and the RD buffer effective flag35is off.

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