Zilog Z16C30 - Manual (Page 123)

6-4
Z16C30 USC ®
U SER ' S M ANUAL
UM97USC0100
Z
ILOG
6.2 FLYBY VS. FLOWTHROUGH DMA OPERATION (Continued)
Figure 6-3. Flyby DMA Transfer, Memory to Peripheral Device
DMAC
Memory Device
REQ
Address
Memory Location
/RD
Data
from Memory
to Device
/WR
If that's enough data for now
if the device wants more data
DMA Request
(e.g., /TxREQ)
Must be blocked
at USC
DMA Acknowledge
(e.g., /TxACK)
ACK
data
UM009402-0201