Single Data-Transfer Mode With Single Buffer-Transfer Mode - Intel 386 User Manual

DMA CONTROLLER
After initialization, the DMA channel is
programmed with the requester and
target addresses and a byte count.
No
DREQ n
active?
Yes
DMA gains bus control.
DMA transfers one byte or word of data
and decrements the byte count.
DMA channel relinquishes bus control.
Byte
count = FFFFFFH
or EOP#
No
active?
Yes
Buffer transfer is complete, so channel
becomes idle.
A2331-02
Figure 12-8. Single Data-transfer Mode with Single Buffer-transfer Mode
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