LPC47M192-NW Standard Microsystems (SMSC), LPC47M192-NW Datasheet - Page 100

• Manufacturer Part Number: LPC47M192-NW
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M192-NW

• Lead Free Status / RoHS Status: Compliant

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 48 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:
1.
2.
Note:
Exit Auto Powerdown
The transmitter exits powerdown on a write to the XMIT buffer. The receiver exits auto powerdown when RXDx
changes state.
MPU-401 Power Management
Direct power management is controlled by CR22. Refer to CR22 for more information.
Auto Power Management is enabled by CR23-B6. When set, this bit allows the following auto power management
operations
1.
2.
SMSC DS – LPC47M192
The transmitter enters auto powerdown when the transmit buffer and shift register are empty.
The receiver enters powerdown when the following conditions are all met:
A.
B.
The transmitter enters auto powerdown when the transmit buffer and shift register are empty
The receiver enters powerdown when the following conditions are all met:
Receive FIFO is empty
The receiver is waiting for a start bit.
While in powerdown the Ring Indicator interrupt is still valid and transitions when the RI input changes.
Table 48 - State of Floppy Disk Drive Interface Pins in Powerdown
SYSTEM PINS
Table 47 - State of System Pins in Auto Powerdown
PCI_RESET#
DRVDEN[0:1]
LFRAME#
SER_IRQ
nWRTPRT
nDSKCHG
PCI_CLK
FDD PINS
LAD[3:0]
LPCPD#
nWGATE
nWDATA
nRDATA
nHDSEL
LDRQ#
nINDEX
nMTR0
nTRK0
nSTEP
nDS0
nDIR
DATASHEET
OUTPUT PINS
INPUT PINS
STATE IN AUTO POWERDOWN
Page 100
STATE IN AUTO POWERDOWN
Tristated
Tristated
Tristated
Tristated
Active
Active
Active
Active
Input
Input
Input
Input
Input
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Rev. 03/30/05