DMA transfer control device

Details DMA transfer control device DMA transfer control device

2008-09-18

2011-10-11

Sorrell, Eron J (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S020000, C710S034000, C709S214000, C709S216000, C712S225000

Reexamination Certificate

active

08037216

ABSTRACT:
A DMA transfer control device includes a setting register group for setting transfer informations, a number-of-transfers register to which the number of transfers to be performed is set, and which updates a value thereof every time one DMA transfer is completed, a transfer control unit, a secondary setting register group for setting other transfer informations different from the transfer informations, and a specified ordinal-number-of-transfer register. Every time one DMA transfer is initiated, either a value of the setting register group or a value of the secondary setting register group is selected for each of the transfer informations in accordance with a result of an arithmetic operation between a value of the number-of-transfers register and a value of the specified ordinal-number-of-transfer register, and inputted to the transfer control unit. As a result, by making settings for one DMA transfer, it is possible to temporarily change the transfer informations.

REFERENCES:
patent: 5613162 (1997-03-01), Kabenjian
patent: 2002/0026544 (2002-02-01), Miura
patent: 2004/0093439 (2004-05-01), Miura et al.
patent: 2006/0179181 (2006-08-01), Seong
patent: 2006/0206633 (2006-09-01), Suetake
patent: 2006/0288128 (2006-12-01), Moskalev et al.
patent: 2007/0073924 (2007-03-01), Kuroki et al.
patent: 2008/0201494 (2008-08-01), Kimelman et al.
patent: 2002-073527 (2002-03-01), None

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