System Interface Pins
Table 48 gives the state of the interface pins in the powerdown state. Pins unaffected by the powerdown are labeled
“Unchanged.”
Table 48 – State of System Pins in Auto Powerdown
SYSTEM PINS
LAD[3:0]
STATE IN AUTO POWERDOWN
Unchanged
LDRQ#
Unchanged
LPCPD#
Unchanged
LFRAME#
PCI_RESET#
PCI_CLK
Unchanged
Unchanged
Unchanged
SER_IRQ
Unchanged
FDD Interface Pins
All pins in the FDD interface, which 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 49 depicts the state of the floppy disk drive interface pins in the powerdown state.
Table 49 – State of Floppy Disk Drive Interface Pins in Powerdown
FDD PINS
STATE IN AUTO POWERDOWN
INPUT PINS
Input
nRDATA
nWRTPRT
nTRK0
Input
Input
nINDEX
Input
nDSKCHG
Input
OUTPUT PINS
Tristated
Tristated
Active
nMTR0
nDS0
nDIR
nSTEP
Active
nWDATA
nWGATE
nHDSEL
DRVDEN[0:1]
Tristated
Tristated
Active
Active
SMSC DS – LPC47M14X
Page 96
Rev. 03/19/2001
SMSC [ SMSC CORPORATION ]
