ICS9150-04 Datasheet, PDF (4/19 Pages) Integrated Circuit Systems – Pentium Pro™ and SDRAM Frequency Generator

ICS9150- 04
Mode Pin - Power Management Input Control
MODE, Pin 55
0
1
Pin 54
CPU_STOP#
Input
IOAPIC1
Output
Pin 16
PCI_STOP#
Input
PCICLK5
Output
Power Management Functionality
CPU_STOP#
0
PCI_STOP#
0
CPUCLK
Outputs
PCICLK(0:5)
Outputs
PCICLK_F,
REF, IOAPIC
48MHz
and SDRAM
Stopped Low Stopped Low Running
0
1
Stopped Low Running
Running
1
0
Running Stopped Low Running
1
1
Running
Running
Running
Crystal
OSC
Running
Running
Running
Running
VCO
Running
Running
Running
Running
Spread Spectrum Functionality
BYTE0, Bit1
SS_EN
BYTE0, Bit2
SS_TYPE
BYTE0, Bit7
CPU, SDRAM
and PCI CLOCKS
0
Frequency modulated in center spread
spectrum mode +1.5%, -1.5%
0
1
1
Frequency modulated in center spread
spectrum mode +0.5%, -0.5%
0
Frequency modulated in down spread
spectrum mode +0%, -3.0%
1
1
Frequency modulated in down spread
spectrum mode +0%, -1.0%
0
X
X
Normal, Steady frequency mode
REF, IOAPIC
14.318MHz
14.318MHz
14.318MHz
14.318MHz
14.318MHz
24,48M Hz
24,48MHz
24,48MHz
24,48MHz
24,48MHz
24,48MHz
CPU 3.3#_2.5V Buffer selector for CPUCLK driver.
CPU3.3#_2.5
Latched Input Level
1
0
Buffer Selected
for Operation at:
2.5V VDD
3.3V VDD
4