FDC37C93XAPM View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
FDC37C93XAPM
SMSC -> Microchip
'FDC37C93XAPM' PDF : 280 Pages View PDF
DIGITAL INPUT REGISTER (DIR)
Address 3F7 READ ONLY
This register is read-only in all modes.
PC/AT Mode
7
6
5
4
3
2
1
0
DSK
CHG
RESET N/A N/A N/A N/A N/A N/A N/A N/A
COND.
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
7
6
5
4
3
2
1
0
DSK
1
1
1
1 DRATE DRATE nHIGH
CHG
SEL1 SEL0 nDENS
RESET N/A N/A N/A N/A N/A N/A N/A
1
COND.
BIT 0 nHIGH DENS
This bit is low whenever the 500 Kbps or 1 Mbps
data rates are selected, and high when 250
Kbps and 300 Kbps are selected.
BIT 1 and 2 DATA RATE SELECT
These bits control the data rate of the floppy
controller. See Table 11 for the settings
corresponding to the individual data rates. The
data rate select bits are unaffected by a
software reset and are set to 250 Kbps after a
hardware reset.
BIT 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.
30
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