FDD Interface Pins
Pins used for local logic control or part
programming are unaffected. Table 46 depicts
the state of the floppy disk drive interface pins in
the powerdown state.
All pins in the FDD interface which can be
connected directly to the floppy disk drive itself
are either DISABLED or TRISTATED.
Table 46 - State of Floppy Disk Drive Interface Pins in Powerdown
FDD PINS
STATE IN AUTO POWERDOWN
INPUT PINS
Input
nRDATA
nWPROT
nTR0
Input
Input
nINDEX
nDSKCHG
Input
Input
OUTPUT PINS
Tristated
Tristated
Active
nMTR0
nDS0
nDIR
nSTEP
Active
nWDATA
nWGATE
nHDSEL
DRVDEN[0:1]
Tristated
Tristated
Active
Active
110
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