SM8702AM datasheet(3/16 Pages) NPC

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SM8702AM

NIPPON PRECISION CIRCUITS—3

BLOCK DIAGRAM

PIN DESCRIPTION

Number

Name

I/O

Function

Notes

VDD1

–

3.3V supply

X T, XTN oscillator, REF[0:1] buffer, stop logic, 3.3V line

REF0

I/O

14.318MHz reference clock output

V S S

–

Ground

Cr ystal oscillator, REF[0:1], 3.3Vline

X T

Cr ystal oscillator input

X T N

Cr ystal oscillator output

VDD2

–

3.3V supply

PCI clock output buffers, pre-buffer, stop logic, and

internal circuit logic supply

PCICLK_F

PCI bus free-running clock output

MODE

Mode settings (latch input)

CPU_ST OP# (pin 17) and PCI_STOP# (pin 18) mode

select pin.

MODE = HIGH: Desktop mode

MODE = LOW: Mobile mode

PCICLK0

PCI bus clock output

V S S

–

Ground (3.3V supply)

PCI clock output buffers, pre-buffer, stop logic

1 0

PCICLK1

PCI bus clock output

SS_CONTROLLER

DIV/3

to DIV/6

DIV/2

N-Countor

Phase

Detector

Charge

Pump

VCO

R-Countor

Unlock Detector

Current

Source

N-Countor

Phase

Detector

Charge

Pump

VCO

R-Countor

Unlock Detector

Current

Source

Buff. Amp.

I/O

Latch

Control Logic

DIV/3

1/2

ROM

XTN

(1st PLL)

BUFFERIN

FS[0:2]

MODE

SDATA

SCLK

CPU_STOP#

PCI_STOP#

PCICLK_F

(MS)

PCICLK

[0:4]

IOAPIC

48MHz

(USB)

REF[0:1]

(2nd PLL)

CPUCLK

[0:1]

SDRAM

[0:13]

24MHz

(Super I/O)

I C

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