FDC37C672QFP SMSC Corporation, FDC37C672QFP Datasheet - Page 104

• Manufacturer Part Number: FDC37C672QFP
• Description: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
• Manufacturer: SMSC Corporation

SMSC FDC37C672
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 13.3 depicts the state of the
floppy disk drive interface pins in the powerdown state.
UART Power Management
Direct power management is controlled by CR22. Refer to CR22 for more information.
Auto Power Management is enabled by CR23-B4 and B5. When set, these bits allow the following auto
power management operations:
Table 13.3 - State of Floppy Disk Drive Interface Pins in Powerdown
Table 13.2 - State of System Pins in Auto Powerdown
SYSTEM PINS STATE IN AUTO POWERDOWN
RESET_DRV
DRVDEN[0:1]
SA[0:9]
SD[0:7]
DACKx
SD[0:7]
nDSKCHG
nMTR[0:1]
DRQx
FDD Pins
nIOW
nWPROT
nWGATE
nIOR
nWDATA
IRQx
nRDATA
nDS[0:1]
nHDSEL
nINDEX
TC
nSTEP
nTR0
nDIR
DATASHEET
Output Pins
INPUT PINS
Output Pins
Input Pins
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State in Auto Powerdown
Unchanged (low)
Unchanged (low)
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Tristated
Tristated
Tristated
Tristated
Active
Active
Active
Active
Input
Input
Input
Input
Input
Enhanced Super I/O Controller with Fast IR
Rev. 10-29-03
Datasheet