Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
12-22
Figure 12-14. Demand Data-transfer Mode with Single Buffer-transfer Mode
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.
Buffer transfer is complete, so channel
becomes idle.
Yes
No
DREQ
n
active?
Yes
No
DMA channel
relinquishes
bus control.
A2338-02
DREQ
n
active?
Yes
No
Byte
count = FFFFFFH
or EOP#
active?