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

Intel386™ EX EMBEDDED MICROPROCESSOR USER'S MANUAL
Figure 12-12. Block Data-transfer Mode with Autoinitialize Buffer-transfer Mode
12-20
After initiallization, 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
Byte
count = FFFFFFH
or EOP#
No
active?
Yes
DMA channel relinquishes bus control.
DMA channel is reprogrammed with the
original addresses and byte count.
No
A2333-02