參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 40/164頁
文件大?。?/td> 621K
代理商: 37C669
134
CR24
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
(serial port 1).
The serial port can be set to 96
locations, on 8 byte boundaries from 100H-
3F8H.
To disable the serial port, set ADR9
and ADR8 to zero.
Upper Address Decode requirements : nCS='0'
and A10='0' are required to access UART1
registers. A[2:0] are decoded as XXXb.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ADR9
ADR8
ADR7
ADR6
ADR5
ADR4
ADR3
0
CR25
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
(serial port 2).
The serial port can be set to 96
locations, on 8 byte boundaries from 100H-
3F8H.
To disable the serial port, set ADR9
and ADR8 to zero.
Upper Address Decode requirements : nCS='0'
and A10='0' are required to access UART2
registers. A[2:0] are decoded as XXXb.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ADR9
ADR8
ADR7
ADR6
ADR5
ADR4
ADR3
0
CR26
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized
to
26H.
The default value of this
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.
D3-D0
D7-D4
DMA Selected
0000
None
0001
DMA_A
0010
DMA_B
0011
DMA_C
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