Z80181 Zilog., Z80181 Datasheet - Page 25

• Manufacturer Part Number: Z80181
• Description: SMART ACCESS CONTROLLER (SAC)
• Manufacturer: Zilog.

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