LPC47N237-MD datasheet(13/138 Pages) SMSC

13 / 138 page

3.3v I/O Controller for Port Replicators and Docking Stations

SMSC DS – LPC47N237

Page 13

Revision 0.3 (10-26-04)

DATASHEET

Chapter 4 Description of Pin Functions

Table 4.1 – Pin Description

PIN#

NAME

(NOTE 4.1)

DESCRIPTION

BUFFER

NAME

(NOTE 4.2)

PWR

WELL

(NOTE

4.3)

NOTES

POWER PINS (16)

1,18,

32,63

VTR

+3.3 Volt Standby Supply Voltage (4)

13,48,

53,65,

VCC

+3.3 Volt Supply Voltage (5)

7,19,

31,39,

56,60,

VSS

Ground (7)

CLOCKS (3)

XTAL1

24MHz Crystal Clock Input. It can also be

used as single-ended oscillator clock input.

ICLK

VTR

(Note 4.4)

XTAL2

24MHz Crystal Clock Output

OCLK

VTR

(Note 4.4)

24MHz_OUT

24MHz Clock Output

O12

VCC

(Note 4.5)

PROCESSOR/HOST LPC INTERFACE (12)

nIO_PME

This active low Power Management signal

allows to request wakeup. It can be

configured to be Push-Pull output

OD12

VTR

23:20

LAD[3:0]

Active high LPC I/O used for multiplexed

command, address and data bus.

PCI_IO

VCC

nLFRAME

Active low input indicates start of new cycle

and termination of broken cycle.

PCI_I

VCC

nLDRQ

Active low output used for encoded

DMA/Bus Master request for the LPC

interface.

PCI_O

VCC

nPCI_RESET

Active low input used as LPC Interface

Reset.

PCI_I

VCC

nLPCPD

Active low input Power Down signal

indicates that the LPC47N237 should

prepare for power to be shut-off on the LPC

interface.

PCI_I

VCC

(Note 4.6)

nCLKRUN

This signal is used to indicate the PCI clock

status and to request that a stopped clock

be started.

PCI_IOD

VCC

PCI_CLK

PCI clock input.

PCI_ICLK

VCC

SER_IRQ

Serial IRQ pin used with the PCI_CLK pin to

transfer LPC47N237 interrupts to the host.

PCI_IO

VCC

SERIAL PORT INTERFACE (8)

RXD

Receiver serial data input.

VCC

TXD

Transmit serial data output.

O12

VCC

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