Zilog Z16C30 - Manual (Page 124)

6-5
Z16C30 USC ®
U SER ' S M ANUAL Z
ILOG
UM97USC0100
Figure 6-4. *Flyby DMA Transfer, Peripheral Device to Memory
DMAC
Memory Device
REQ
Address
Memory Location
/RD
Data
from Device
to Memory
/WR
If the device doesn't have (much) more data
if the device wants to provide more data
DMA Request
(e.g., /RxREQ)
DMA Acknowledge
(e.g., /RxACK)
ACK
data
Must be blocked
at USC
UM009402-0201