Zilog Z16C30 - Manual (Page 121)

6-2
Z16C30 USC ®
U SER ' S M ANUAL
UM97USC0100
Z
ILOG
6.2 FLYBY VS. FLOWTHROUGH DMA OPERATION (Continued)
DMAC
Memory Device
data
REQ
DMAC
Memory Device
data
REQ
Address
Memory Location Data Register in Device
/RD
Data
from Memory
to DMAC
from DMAC
to Device
/WR
If that's enough data for now
if the device wants more data
DMA Request
(e.g., /TxREQ)
Figure 6-1. Flowthrough DMA Transfer, Memory to Peripheral Device
UM009402-0201