LPC47M192 datasheet(12/228 Pages) SMSC

12 / 228 page

SMSC DS – LPC47M192

Page 12

Rev. 03/30/05

DATASHEET

DESCRIPTION OF PIN FUNCTIONS

QFP PIN#

NAME

DESCRIPTION

BUFFER

NAME

PWR

WELL

NOTES

POWER PINS (10)

53, 65,93

VCC

+3.3 Volt Supply Voltage

VTR

+3.3 Volt Standby Supply Voltage

VREF

Reference Voltage

7, 31, 60,76

VSS

Ground

AVSS

Analog Ground

CLOCKS (2)

CLOCKI32

32.768kHz Trickle Clock Input

VTR

CLOCKI

14.318MHz Clock Input

VCC

PROCESSOR/HOST LPC INTERFACE (10)

23:20

LAD[3:0]

Active high LPC I/O used for multiplexed

command, address and data bus.

PCI_IO

VCC

LFRAME#

Active low input indicates start of new cycle

and termination of broken cycle.

PCI_I

VCC

LDRQ#

Active

low

output

used

for

encoded

DMA/Bus Master request for the LPC

interface.

PCI_O

VCC

PCI_RESET#

Active low input used as LPC Interface

Reset.

PCI_I

VCC

LPCPD#

Active low input Power Down signal indicates

that the LPC47M192 should prepare for

power to be shut-off on the LPC interface.

PCI_I

VCC

PCI_CLK

PCI clock input.

PCI_ICLK

VCC

SER_IRQ

Serial IRQ pin used with the PCI_CLK pin

to transfer LPC47M192 interrupts to the

host.

PCI_IO

VCC

FAN CONTROL (4)

GP30/

FAN_TACH2

General Purpose I/O.

GPIO can be

configured as an Open-Drain Output.

/Fan Tachometer 2 Input

IO8

VCC

GP31/

FAN_TACH1

General Purpose I/O.

GPIO can be

configured as an Open-Drain Output.

/Fan Tachometer 1 Input

IO8

VCC

GP32/

FAN2

General Purpose I/O

/Fan Speed Control 2 Output

Both functions can be configured as Open-

Drain Output.

IO12

VCC

5, 6

GP33/

FAN1

General Purpose I/O

/Fan Speed Control 1 Output

Both functions can be configured as Open-

Drain Output.

IO12

VCC

5, 6

FDD INTERFACE (14)

nRDATA

Raw serial bit stream from the disk drive, low

active. Each falling edge represents a flux

transition of the encoded data.

VCC

nWGATE

Write Gate Output.

This active low high

current driver allows current to flow through

the write head. It becomes active just prior

to writing to the diskette. Can be configured

as an Open-Drain Output.

O12

VCC

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