IDTTM/ICSTM PC MAIN CLOCK

1397—11/08/10

ICS9LP525-2

PC MAIN CLOCK

3

Pin Description (continued)

PIN #

PIN N A ME

TYPE

D ESC R IPTION

25

SRCC3/CR#_D

I/O

Complementary c loc k of differential SRC c loc k pair/ Cloc k Reques t c ontrol D for either SRC1 or SRC4 pair

The power-up default is SRCCLK3 output, but this pin may als o be us ed as a Cloc k Reques t c ontrol of SRC pair 1 or SRC pair 4

v ia SMBus . Before c onfiguring this pin as a Cloc k Reques t Pin, the SRC output mus t firs t be dis abled in by te 4, bit 7 of SMBus

addres s s pac e . After the SRC output is dis abled, the pin c an then be s et to s erv e as a Cloc k Reques t pin for either SRC pair 1 or

pair 4 us ing the CRD#_EN bit loc ated in by te 5 of SMBUs addres s s pac e.

By te 5, bit 1

0 = SRC3 enabled (default)

1= CRD# enabled. By te 5, bit 0 c ontrols whether CRD# c ontrols SRC1 or SRC4 pair

By te 5, bit 0

0 = CRD# c ontrols SRC1 pair (default),

1= CRD# c ontrols SRC4 pair

26

VDDSRC_IO

PWR

Power s upply for SRC c loc k s . 0.8V nominal from s ourc e/emitter of ex ternal pas s trans is tor

27

SRCT4

O UT

True c loc k of low power differential SRC c loc k pair.

28

SRCC4

O UT

Complement c loc k of low power differential SRC c loc k pair.

29

CPU_ST O P#/SRCC5

I/O

Ref, XTAL power s upply , nominal 3.3V

30

PCI_ST O P#/SRCT 5

I/O

Stops all PCICLKs at logic 0 lev el, when low. F ree running PCICLKs are not effec ted by this input. / T rue c loc k of differential pus h-

pull SRC pair.

31

VDDSRC

PWR

Supply for SRC PLL, 3.3V nominal

32

SRCC6

O UT

Complement c loc k of low power differential SRC c loc k pair.

33

SRCT6

O UT

True c loc k of low power differential SRC c loc k pair.

34

G NDSRC

PWR

G round pin for the SRC outputs

35

SRCC7/CR#_E

I/O

Complement c loc k of differential pus h-pull SRC c loc k pair. / Cloc k Reques t c ontrol E for SRC6 pair. T he power-up default is

SRC7#, but this pin may als o be us ed as a Cloc k Reques t c ontrol of SRC6 v ia SMBus . Before c onfiguring this pin as a Cloc k

Reques t Pin, the SRC7 output pair mus t firs t be dis abled in by te 3, bit 3 of SMBus c onfiguration s pac e . After the SRC output is

dis abled (high-Z), the pin c an then be s et to s erv e as a Cloc k Reques t for SRC6 pair us ing by te 6, bit 7 of SMBus c onfiguration

s pac e

By te 6, bit 7

0 = SRC7# enabled (default)

1= CRE# enabled.

36

SRCT7/CR#_F

I/O

True c loc k of differential pus h-pull SRC c loc k pair/ Cloc k Reques t c ontrol 8 for SRC8 pair

The power-up default is SRC7, but this pin may als o be us ed as a Cloc k Reques t c ontrol of SRC8 v ia SMBus . Before c onfiguring

this pin as a Cloc k Reques t Pin, the SRC7 output pair mus t firs t be dis abled in by te 3, bit 3 of SMBus c onfiguration s pac e After the

SRC output is dis abled (high-Z), the pin c an then be s et to s erv e as a Cloc k Reques t for SRC8 pair us ing by te 6, bit 6 of SMBus

c onfiguration s pac e.

By te 6, bit 6

0 = SRC7# enabled (default)

1 = CRF# enabled.

37

VDDSRC_IO

PWR

Power s upply for SRC c loc k s . 0.8V nominal from s ourc e/emitter of ex ternal pas s trans is tor

38

CPUC2_IT P/SRCC8

O UT

Complement c loc k of low power differential CPU2/Complement c loc k of differential SRC pair. The func tion of this pin is determined

by the latc hed input v alue on pin 7, PCIF5/ITP_EN on powerup. T he func tion is as follows :

Pin 7 latc hed input Value

0 = SRC8#

1 = ITP#

39

CPUT2_IT P/SRCT8

O UT

True c loc k of low power differential CPU2/True c loc k of differential SRC pair. The func tion of this pin is determined by the latc hed

input v alue on pin 7, PCIF5/ITP_EN on powerup. T he func tion is as follows :

Pin 7 latc hed input Value

0 = SRC8

1 = ITP

40

VO UT

PWR

O P Amp c omparator output. T his pin driv es the bas e/gate of the ex ternal pas s trans is tor

41

VDDCPU_IO

PWR

Supply for CPU c loc k s . 0.8V nominal from s ourc e/emitter of ex ternal pas s trans is tor

42

CPUC1_F

O UT

Complementary c loc k of low power differential pus h-pull CPU output. This CPU c loc k is free running during iAMT.

43

CPUT1_F

O UT

True c loc k of differential pus h-pull CPU c loc k pair. T his c loc k is free running during iAMT.

44

G NDCPU

PWR

G round pin for the CPU outputs

45

CPUC0

O UT

Complement c loc k of low power differential CPU c loc k pair.

46

CPUT0

O UT

True c loc k of low power differential CPU c loc k pair.

47

VDDCPU

PWR

Supply for CPU PLL, 3.3V nominal

48

CK_PWRG D/PD#

IN

Notifies CK505 to s ample latc hed inputs , or iAMT entry /ex it, or PWRDWN# mode

49

F SLB/T EST _MO DE

IN

3.3V tolerant input for CPU frequenc y s elec tion. Refer to input elec tric al c harac teris tic s for Vil_FS and Vih_F S v alues .

TEST_MO DE is a real time input to s elec t between Hi-Z and REF /N div ider mode while in tes t mode. Refer to Tes t Clarific ation

Table.

50

G NDREF

PWR

G round pin for the REF outputs .

51

X2

O UT

Cry s tal output, Nominally 14.318MHz

52

X1

IN

Cry s tal input, Nominally 14.318MHz .

53

VDDREF

PWR

Ref, XTAL power s upply , nominal 3.3V

54

REF 0/F SLC/TEST_SEL

I/O

14.318 MHz referenc e c loc k ./ 3.3V tolerant input for CPU frequenc y s elec tion. Refer to input elec tric al c harac teris tic s for Vil_F S

and Vih_F S v alues . /TEST_Sel: 3-lev el latc hed input to enable tes t mode. Refer to Tes t Clarific ation T able

55

SDATA

I/O

Data pin for SMBus c irc uitry , 5V tolerant.

56

SCLK

IN

Cloc k pin of SMBus c irc uitry , 5V tolerant.