參數(shù)資料
型號: FDC37C665GT
廠商: STANDARD MICROSYSTEMS CORP
元件分類: 存儲控制器/管理單元
英文描述: High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
中文描述: 1 Mbps, IDE COMPATIBLE, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝: QFP-100
文件頁數(shù): 34/162頁
文件大小: 562K
代理商: FDC37C665GT
34
DIGITAL INPUT REGISTER (DIR)
Address 3F7 READ ONLY
This register is read-only in all modes.
PC-AT Mode
BIT 0 - 6 UNDEFINED
The data bus outputs D0 - 6 will remain in a
high impedance state during a read of this
register.
BIT 7 DSKCHG
This bit monitors the pin of the same name and
reflects the opposite value seen on the disk
cable.
PS/2 Mode
BIT 0 nHIGH DENS
This bit is low whenever the 500 Kbps or 1 Mbps
data rates are selected, and high when 250Kbps
and 300Kbps are selected.
BITS 1 - 2 DATA RATE SELECT
These bits control the data rate of the floppy
controller. See Table 13 for the settings
corresponding to the individual data rates. The
data rate select bits are unaffected by a
software reset, and are set to 250kb/s after a
hardware reset.
BITS 3 - 6 UNDEFINED
Always read as a logic "1"
BIT 7 DSKCHG
This bit monitors the pin of the same name and
reflects the opposite value seen on the disk
cable.
7
6
5
4
3
2
1
0
DSK
CHG
N/A
RESET
COND.
N/A
N/A
N/A
N/A
N/A
N/A
N/A
7
6
1
5
1
4
1
3
1
2
1
0
DSK
CHG
N/A
DRATE
SEL1
N/A
DRATE
SEL0
N/A
nHIGH
DENS
1
RESET
COND.
N/A
N/A
N/A
N/A
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