CR24
locations, on 8 byte boundaries from 100H-3F8H.
disable the serial port, set ADR9 and ADR8 to zero.
To
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized to 25H.
The default value of this register after power up is 00H.
This register is used to select the base address of UART1
Upper Address Decode requirements : nCS='0' and
A10='0' are required to access UART1 registers. A[2:0]
are decoded as XXXb.
(serial port 1).
The serial port can be set to 96
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ADR9
ADR8
ADR7
ADR6
ADR5
ADR4
ADR3
0
CR25
locations, on 8 byte boundaries from 100H-3F8H.
disable the serial port, set ADR9 and ADR8 to zero.
To
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized to 25H. The
default value of this register after power up is 00H. This
register is used to select the base address of UART2
Upper Address Decode requirements : nCS='0' and
A10='0' are required to access UART2 registers. A[2:0]
are decoded as XXXb.
(serial port 2).
The serial port can be set to 96
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ADR9
ADR8
ADR7
ADR6
ADR5
ADR4
ADR3
0
CR26
register after power up is 00H. This register is used to
select the DMA for the FDC (Bits 4:7) and the parallel
port (bits 3:0). Any unselected DMA REQ output is in
tristate.
This register can only be accessed in the Configuration
Mode and after the CSR has been initialized to 26H.
The default value of this
D3-D0
D7-D4
DMA Selected
None
0000
0001
0010
0011
DMA_A
DMA_B
DMA_C
133
SMSC [ SMSC CORPORATION ]
