FDC37N958FR Datasheet, PDF (27/316 Pages) List of Unclassifed Manufacturers – Notebook I/O Controller with Enhanced Keyboard and System Control

Table 6 - State of Floppy Disk Drive Interface pins in FDC Powerdown
FDD PINS
STATE IN FDC AUTO
POWERDOWN
Input Pins
nRDATA
Input
nWPROT
Input
nTRK0
Input
nINDEX
Input
nDSKCHG
Input
Output Pins
nMTR[1:0]
Tristated
nDS[1:0]
Tristated
nDIR
Active
nSTEP
Active
nWDATA
Tristated
WGATE
Tristated
nHDSEL
Active
DRVDEN[1:0]
Active
FPD
Active
Table 6A - FPD Pin Behavior
POWER DOWN BIT, FDC BIT, GCR23 BIT-0 FDC SHUTDOWN BIT, FPD PIN
DSR, BIT-6
AUTO POWER DOWN FDD MODE REGISTER STATE
0
0
0
0
1
0
0
1
X
1
0
1 (Note)
X
X
1
1
Note:
The FPD pin will go active when the FDC auto powers down. Refer to the
FDC auto power management section for more details.
SMSC DS – FDC37N958FR
Page 21
Rev. 09/01/99