AV9148F-25 데이터 시트보기 (PDF) - Integrated Circuit Systems

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AV9148F-25

Pentium/Pro™ System and Cyrix™ Clock Chip

Integrated Circuit Systems 

ICS9148-25

Mode Pin - Power Management Input Control

MODE, Pin 6

Pin 26

Pin 27

0

PCI_STOP#

Input

CPU_STOP#

Input

1

SDRAM7 Output

SDRAM 6

Output

Power Management Functionality

CPU_STOP# PCI_STOP#

PD#

CPUCLK

Outputs

PCICLK(0:5)

Outputs

PCICLK_F,

REF,

24/48MHz

and SDRAM

X

X

0

Stopped Low Stopped Low Stopped Low

0

0

1

Stopped Low Stopped Low

Running

0

1

1

Stopped Low

Running

Running

1

0

1

Running

Stopped Low

Running

1

1

1

Running

Running

Running

Crystal

OSC

Off

Running

Running

Running

Running

VCO

Off

Running

Running

Running

Running

Spread Spectrum Functionality

Latched Pin 1

SSM1

0

Latched Pin 9

SSM0

0

0

1

1

0

1*

1*

CPU, SDRAM

and PCICLOCKS

Normal, steady

frequency mode

Frequency modulated in

center spread ±2.0%

Frequency modulated in

center spread ±1.0%

Frequency modulated in

center spread ±0.5%

*default with internal pull-ups

REF, IOAPIC

14.318MHz

14.318MHz

14.318MHz

14.318MHz

24MHz

24MHz

24MHz

24MHz

24MHz

48MHz

48MHz

48MHz

48MHz

48MHz

CPU 3.3_2.5V Buffer selector for CPUCLK and IOAPIC drivers.

CPU3.3_2.5#

Latched Input Level

0

1

Buffer Selected for

Operation at:

2.5V VDD

3.3V VDD

3

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