DMA controller mailing auto-initialize halting unit

Details DMA controller mailing auto-initialize halting unit DMA controller mailing auto-initialize halting unit

1992-10-15

1996-01-02

Swann, Tod R.

Boots, shoes, and leggings

3642423, 36424231, 3642513, 364DIG1, G06F 1328, G06F 1312

Patent

active

054817560

ABSTRACT:
A DMA controller includes a transfer size register written with the number of DMA transfer operations to be performed, a transfer destination address register written with a transfer destination head address for the same DMA transfer operations to be executed, and a transfer size counter and a transfer destination address counter respectively loaded with contents of the transfer size register and the transfer destination address register when the DMA transfer is restarted, for the purpose of performing an auto-initialize operation. The DMA controller is configured so that when either or both of the head address and the transfer size for a next DMA transfer is not set in the transfer size register and the transfer destination address register in the course of execution of the DMA transfer before the next DMA transfer, the auto-initialize operation is halted.

REFERENCES:
patent: 5077664 (1991-12-01), Taniai et al.
patent: 5325489 (1994-06-01), Mitsuhira et al.

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