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.
To Next Page
Loading...
