LPC47M192 datasheet(100/228 Pages) SMSC

100 / 228 page

SMSC DS – LPC47M192

Page 100

Rev. 03/30/05

DATASHEET

Table 47 - State of System Pins in Auto Powerdown

SYSTEM PINS

STATE IN AUTO POWERDOWN

LAD[3:0]

Unchanged

LDRQ#

Unchanged

LPCPD#

Unchanged

LFRAME#

Unchanged

PCI_RESET#

Unchanged

PCI_CLK

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 48 depicts the state of the floppy disk drive interface pins in the powerdown state.

Table 48 - State of Floppy Disk Drive Interface Pins in Powerdown

FDD PINS

STATE IN AUTO POWERDOWN

INPUT PINS

nRDATA

Input

nWRTPRT

Input

nTRK0

Input

nINDEX

Input

nDSKCHG

Input

OUTPUT PINS

nMTR0

Tristated

nDS0

Tristated

nDIR

Active

nSTEP

Active

nWDATA

Tristated

nWGATE

Tristated

nHDSEL

Active

DRVDEN[0:1]

Active

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:

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. Receive FIFO is empty

B. The receiver is waiting for a start bit.

Note:

While in powerdown the Ring Indicator interrupt is still valid and transitions when the RI input changes.

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

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:

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