参数资料
型号: 37C669
厂商: 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: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 38/164页
文件大小: 621K
代理商: 37C669
132
CR1F
This register can only be accessed in the
Configuration Mode and after the CSR has
been initialized
to 1FH. The default value
of this register after power up is 00H.
This
register indicates the Drive Type used for each
drive.
Refer to CR0B for Data Rate Table
register.
FDD3
FDD2
FDD1
FDD0
D7
D6
D5
D4
D3
D2
D1
D0
DT0
DT1
DT0
DT1
DT0
DT1
DT0
DT1
DTx = Drive Type select
DT0
DT1
DRVDEN0
(Note)
DRVDEN1
(Note)
Drive Type
0
DENSEL
DRATE0
4/2/1 MB 3.5"
2/1 MB 5.25" FDDS
2/1.6/1 MB 3.5" (3-MODE)
0
1
DRATE1
DRATE0
1
0
nDENSEL
DRATE0
PS/2
1
DRATE0
DRATE1
Note:
DENSEL, DRATE1 and DRATE0 map onto two output pins DRVDEN0 and DRVDEN1.
CR20
This register can only be accessed in the
Configuration Mode and after the CSR has been
initialized to 20H.
The default value of this
register after power up is 3CH. This register is
used to select the base address of the floppy
disk
controller
(FDC).
The
FDC
can
be set to 48 locations, on 16 byte boundaries
from 100H-3F0H.
To disable the FDC, set
ADR9 and ADR8 to zero.
Upper Address Decode requirements: nCS='0'
and A10='0' are required to access the FDC
registers. A[3:0] are decoded as 0XXXb.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ADR9
ADR8
ADR7
ADR6
ADR5
ADR4
0
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