Data transfer apparatus capable of handling DMA block transfer i

Details Data transfer apparatus capable of handling DMA block transfer i Data transfer apparatus capable of handling DMA block transfer i

1995-10-12

1998-09-15

An, Meng-Ai T.

395737, 395848, 395860, 395843, G06F 1328

Patent

active

058093354

ABSTRACT:
A method and a data transfer apparatus capable of handling DMA block transfer interruptions are provided. The data transfer apparatus includes a plurality of direct memory access (DMA) channels each having different priorities and at least one backup channel information memory for saving control information necessary for a restart of an interrupted DMA transfer through one of the DMA channels. The data transfer apparatus further includes a control means responsive to transfer commands which command DMA transfers through the DMA channels. In addition, the control means executes various interrupt handling steps when a transfer command interrupts an execution of a DMA transfer through one of the DMA channels having a lower priority than the priority of the DMA channel used by the interrupting transfer command, so that an interruption of an important data transfer can be prevented.

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