Intel 386 - Manual (Page 351)

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
12-16
Figure 12-9. Single Data-transfer Mode with Autoinitialize Buffer-transfer Mode
A2332-02
Yes
No
DREQ n
active?
Yes
No
DMA channel is reprogrammed with the
original addresses and byte count.
After initialization, the DMA channel is
programmed with the requester and
target addresses and a byte count.
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#
active?