Hold Arbitration - Fujitsu FR60 Hardware Manual

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Hold Arbitration

When a device is operating in external bus extended mode, an external hold function

can be used. The relationship between external hold requests and DMA transfer

requests by this module when the hold function can be used is described below.

■ DMA Transfer Request During External Hold

The DMA transfer is started but when an external bus area is accessed, DMA transfer is temporarily

stopped. When the external hold is released, DMA transfer is restarted.

■ External Hold Request During DMA Transfer

The device is externally held. When an external bus area is accessed by DMA transfer, DMA transfer is

temporarily stopped. When the external hold is released, DMA transfer is restarted.

■ Simultaneous Occurrence of a DMA Transfer Request and an External Hold Request

The device is externally held and internal DMA transfer is started. When an external bus area is accessed

by DMA transfer, DMA transfer is temporarily stopped. When the external hold is released, DMA transfer

is restarted.

Mb91350a series