SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 139

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
Chapter 10 Power Management
SMSC SCH311X
Power management capabilities are provided for the following logical devices: floppy disk, UART 1,
UART 2 and the parallel port.
Note: Each Logical Device may be place in powerdown mode by clearing the associated activate bit
FDC Power Management
Direct power management is controlled by CR22. Refer to CR22 for more information.
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.
Table 10.1, "State of Floppy Disk Drive Interface Pins in Powerdown"
disk drive interface pins in the powerdown state.
DRVDEN[0:1]
nDSKCHG
nWRTPRT
FDD PINS
nWGATE
nWDATA
nRDATA
nHDSEL
nINDEX
nMTR0
nSTEP
nTRK0
Table 10.1 State of Floppy Disk Drive Interface Pins in Powerdown
nDS0
nDIR
located at CR30 or by clearing the associated power bit located in the Power Control register
at CR22.
DATASHEET
OUTPUT PINS
INPUT PINS
123
STATE IN POWERDOWN
Tristated
Tristated
Tristated
Tristated
Tristated
Tristated
Tristated
Tristated
Input
Input
Input
Input
Input
depicts the state of the floppy
Rev 0.2 (09-28-04)