Table 71 - State of System Pins in Auto Powerdown
SYSTEM PINS
STATE IN AUTO POWERDOWN
Input Pins
IOR
IOW
Unchanged
Unchanged
A[0:9]
D[0:7]
RESET
IDENT
DACK
TC
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Output Pins
Unchanged (low)
Unchanged
FINTR
DB[0:7]
FDRQ
Unchanged (low)
FDD Interface Pins
All pins in the FDD interface that can be connected directly to the floppy disk drive itself are either DISABLED or
TRISTATED. Pins used for local logic control or part programming are unaffected.
Table 72 depicts the state of the floppy disk drive interface pins in the powerdown state.
Table 72 - State of FDC Interface Pins in Powerdown
FDD PINS
STATE IN AUTO POWERDOWN
Input Pins
Input
RDATA
WP
Input
TRK0
Input
INDX
Input
DRV2
DSKCHG
Input
Input
Output Pins
Tristated
Tristated
Active
MOTEN[0:3]
DS[0:3}
DIR
STEP
Active
WRDATA
WE
HDSEL
DENSEL
DRATE[0:1]
Tristated
Tristated
Active
Active
Active
SMSC DS – FDC37N3869
Page 90
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
