Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
12-20
Figure 12-12. Block Data-transfer Mode with Autoinitialize Buffer-transfer Mode
A2333-02
Yes
No
DREQ

n

active?
Yes
No
Byte
count = FFFFFFH
or EOP#
active?
DMA channel is reprogrammed with the
original addresses and byte count.
DMA channel relinquishes bus control.
DMA transfers one byte or word of data
and decrements the byte count
DMA gains bus control.
After initiallization, the DMA channel is
programmed with the requester and target
addresses and a byte count.