4

Integrated

Circuit

Systems, Inc.

ICS9LPR501

1118E—08/08/07

Pin Description (Continued)

PIN #

PIN NAME

TYPE

DESCRIPTION

33

SRCT11/CR#_H

I/O

SRC11 true or Clock Request control H for SRC10 pair

The power-up default is SRC11, but this pin may also be used as a Clock Request control of

SRC10 via SMBus. Before configuring this pin as a Clock Request Pin, the SRC11 output pair

must first be disabled in byte 3 bit 7 of SMBus configuration space After the SRC11 output is

disabled (high-Z), the pin can then be set to serve as a Clock Request for SRC10 pair using

byte 6, bit 4 of SMBus configuration space

Byte 6, bit 4

0 = SRC11 enabled (default)

1= CR#_H controls SRC10.

34

SRCT10

OUT

True clock of differential SRC clock pair.

35

SRCC10

OUT

Cpmplement clock of differential SRC clock pair.

36

VDDSRC_IO

PWR

Power supply for SRC outputs. VDDSRC_IO is 1.05 to 3.3V with +/-5% tolerance

37

CPU_STOP#/SRCC5

I/O

Stops all CPU Clocks, except those set to be free running clocks /

Complement clock of differential SRC pair. The function of this pin is set up by the power-up

strap on pin 6, PCI4/SRC5_EN. The logic value sampled on pin 6 at power-up sets the function

as follows:

0= CPU_STOP#

1 = SRC5

In AMT mode 3 bits are shifted in from the ICH to set the FSC, FSB, FSA values

38

PCI_STOP#/SRCT5

I/O

Stops all PCI Clocks, except those set to be free running clocks /

Complement clock of differential SRC pair. The function of this pin is set up by the power-up

strap on pin 6, PCI4/SRC5_EN. The logic value sampled on pin 6 at power-up sets the function

as follows:

0= PCI_STOP#

1 = SRC5#

In AMT mode, this pin is a clock input which times the FSC, FSB, FSA bits shifted in on pin 37.

39

VDDSRC

PWR

VDD pin for SRC internal circuits, 3.3V nominal

40

SRCC6

OUT

Complement clock of low power differential SRC clock pair.

41

SRCT6

OUT

True clock of low power differential SRC clock pair.

42

GNDSRC

PWR

Ground for SRC clocks

43

SRCC7/CR#_E

I/O

SRC7 complement or Clock Request control E for SRC6 pair

The power-up default is SRC7#, but this pin may also be used as a Clock Request control of

SRC6 via SMBus. Before configuring this pin as a Clock Request Pin, the SRC7 output pair

must first be disabled in byte 3, bit 3 of SMBus configuration space . After the SRC output is

disabled (high-Z), the pin can then be set to serve as a Clock Request for SRC6 pair using byte

6, bit 7 of SMBus configuration space

Byte 6, bit 7

0 = SRC7# enabled (default)

1= CR#_E controls SRC6.

44

SRCT7/CR#_F

I/O

SRC7 true or Clock Request control 8 for SRC8 pair

The power-up default is SRC7, but this pin may also be used as a Clock Request control of

SRC8 via SMBus. Before configuring this pin as a Clock Request Pin, the SRC7 output pair

must first be disabled in byte 3, bit 3 of SMBus configuration space After the SRC output is

disabled (high-Z), the pin can then be set to serve as a Clock Request for SRC8 pair using byte

6, bit 6 of SMBus configuration space

Byte 6, bit 6

0 = SRC7# enabled (default)

1 = CR#_F controls SRC8.

45

VDDSRC_IO

PWR

Power supply for SRC outputs. VDDSRC_IO is 1.05 to 3.3V with +/-5% tolerance

46

CPUC2_ITP/SRCC8

OUT

Complement clock of low power differential CPU2/Complement clock of differential SRC pair.

The function of this pin is determined by the latched input value on pin 7, PCIF5/ITP_EN on

powerup. The function is as follows:

Pin 7 latched input Value

0 = SRC8#

1 = ITP#

47

CPUT2_ITP/SRCT8

OUT

True clock of low power differential CPU2/True clock of differential SRC pair. The function of this

pin is determined by the latched input value on pin 7, PCIF5/ITP_EN on powerup. The function is

as follows:

Pin 7 latched input Value

0 = SRC8

1 = ITP

48

NC

N/A

No Connect