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

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