Z80181 Datasheet, PDF (25/74 Pages) Zilog, Inc. – SMART ACCESS CONTROLLER (SAC™)

Zilog
DMA Registers
SAR0L
Read/Write
SA7
Addr 20h
SA0
DAR0L
Read/Write
DA7
Z80181
SMART ACCESS CONTROLLER SAC^™
Addr 23h
DA0
SAR0H
Read/Write
SA15
Addr 21h
SA8
DAR0H
Read/Write
DA15
Addr 24h
DA8
SAR0B
Read/Write
Addr 22h
SA19
SA16
----
Bits 0-2 (3) are used for SAR0B
A19, A18, A17, A16 DMA Transfer Request
xx
0
0
xx
0
1
xx
1
0
xx
1
1
/DREQ0 (external)
RDR0 (ASCI0)
TDR0 (ASCI1)
Not Used
Figure 29. DMA 0 Source Address Registers
DAR0B
Read/Write
Addr 25h
DA19 DA16
----
Bits 0-2 (3) are used for DAR0B
A19, A18, A17, A16 DMA Transfer Request
xx
0
0
xx
0
1
xx
1
0
xx
1
1
/DREQ0 (external)
RDR0 (ASCI0)
TDR0 (ASCI1)
Not Used
Figure 30. DMA 0 Destination Address Registers
DS971800500
2-25