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PS8734A 09/02/04

Product Features

· 14.318 MHz Crystal Input
· Selectable of 100, 133, 166, 200, 266, 333, and 400MHz CPU

Output Frequencies
· SMBus: Power Management Control
· Spread Spectrum support (-0.5% down spread)
· Packaging (Pb-free & Green available):

-56-Pin SSOP (V)

-56-Pin TSSOP (A)

Output Features

· Two Pairs of Differential CPU Clocks
· One selectable of CPU/SRC Clock
· Six Pairs of SRC Clocks
· Nine PCI Clocks
· One 48 MHz USB clock
· One REF clock
· One 96 MHz Differential clock

Product Description

PI6C410 is a high-speed, low-noise clock generator designed to

work with Intel Desktop PCI-Express Chipset.

Spread Spectrum PLL based clock generator reduce EMI emis-

sion and support a wide range of frequencies.

Jitter Performance

· < 85ps Cycle to Cycle CPU clock jitter

· < 350ps Cycle to Cycle 48MHz clock jitter

· < 500ps Cycle to Cycle PCI clock jitter

· < 125ps Cycle to Cycle SRC clock jitter

· < 1000ps Cycle to Cycle REF clock jitter

Skew Performance

· < 100ps Output to output CPU clock skew

· < 500ps Output to output PCI clock skew

· < 250ps Output to output SRC clock skew

Logic Block Diagram

Pin Description

PI6C410

Clock Generator for Intel PCI-Express Desktop Chipset

Div

PLL 1

XTAL

OSC

SMBus

Logic

REF

DOT_96

DOT 96#

USB_48

PCI [0:5]

PCIF[0:2]

SRC [1:6]

SRC [1:6]#

CPU[0:1]

CPU[0:1]#

XTAL_IN

XTAL_OUT

SDA

SCL

FS_A

FS_B / TEST_MODE

VTT_PWRGD#

/ PWRDWN

CPU2_ITP / SRC7

CPU2_ITP# / SRC7#

Div

PLL 2

FS_C / TEST_SEL

PCIF_0 / ITP_EN

PCI_2

PCI_1

PCI_0

FS_C / TEST_SEL

REF

VSS_REF

XTAL_IN

XTAL_OUT

VDD_REF

SDA

SCL

VSS_CPU

CPU_0

CPU_0#

VDD_CPU

CPU_1

CPU_1#

IREF

VSS_A

VDD_A

CPU2_ITP / SRC7

CPU2_ITP# / SRC7#

VDD_SRC

SRC_6

SRC_6#

SRC_5

SRC_5#

VSS_SRC

VDD_PCI

VSS_PCI

PCI_3

PCI_4

PCI_5

VSS_PCI

VDD_PCI

PCIF_0 / ITP_EN

PCIF_1

PCIF_2

VDD_48

USB_48

VSS_48

DOT_96

DOT_96#

FS_B / TEST_MODE

VTT_PWRGD# / PWRDWN

FS_A

SRC_1

SRC_1#

VDD_SRC

SRC_2

SRC_2#

SRC_3

SRC_3#

SRC_4

SRC_4#

VDD_SRC

PS8734A 09/02/04

PI6C410

Clock Generator for Intel

PCI-Express Desktop Chipset

Pin Description

Pin Name

Type

Pin No

Descriptions

REF

Output

3.3V 14.31818MHz output

XTAL_IN

Input

14.31818MHz crystal input

XTAL_OUT

Output

14.31818MHz crystal output

CPU[0:1] & CPU[0:1]#

Output

40, 41, 43, 44

Differential CPU outputs

SRC[1:6] & SRC[1:6]#

Output

19, 20, 22, 23,

24, 25, 26, 27,

30, 31, 32, 33

Differential Serial Reference Clock outputs

CPU2_ITP / SRC_7 &

CPU2_ITP# / SRC_7#

Output

35, 36

Selectable Differential CPU or SRC clock output

ITP_EN = 0 @ Vtt_Pwrgd# assertion = SRC

ITP_EN = 1 @ Vtt_Pwrgd# assertion = CPU

PCIF_0 / ITP_EN

Input / Output

33MHz clock output / CPU2 select when HIGH

PCIF[1:2]

Output

9, 10

33MHz clocks outputs (free running)

PCI[0:5]

Output

3, 4, 5, 54, 55,

33MHz clocks outputs

USB_48

Output

48MHz clock output

DOT_96 & DOT_96#

Output

14, 15

96MHz differential clock output

FS_A

Input

3.3V LVTTL inputs for CPU frequency selection

FS_B / TEST_MODE

Input

3.3V LVTTL inputs for CPU frequency selection / Test Mode

select: 0 = HiZ, 1 = Ref/N

FS_C / TEST_SEL

Input

3.3V LVTTL inputs for CPU frequency selection / Test Mode

select if pulled to 3.3V when Vtt_Pwrgd# is asserted LOW

IREF

Input

External resistor connection for internal current reference

VTT_PWRGD# /

PWRDWN

Input

3.3V LVTTL Level sensitive strobe used to determine to latch

the FS_A, FS_B/TEST_MODE, FS_C/TEST_SEL and PCIF0/

ITP_EN inputs (active low) / 3.3V LVTTL active high input for

Power Down operation.

SDA

I/O

SMBus compatible SDATA

SCL

Input

SMBus compatible SCLOCK

VDD_PCI

Power

1, 7

3.3V Power Supply for Outputs

VDD_48

Power

3.3V Power Supply for Outputs

VDD_SRC

Power

21, 28, 34

3.3V Power Supply for Outputs

VDD_CPU

Power

3.3V Power Supply for Outputs

VDD_REF

Power

3.3V Power Supply for Outputs

VSS_PCI

Ground

2, 6

Ground for Outputs

VSS_48

Ground

Ground for Outputs

VSS_SRC

Ground

Ground for Outputs

VSS_CPU

Ground

Ground for Outputs

VSS_REF

Ground

Ground for Outputs

VDD_A

Power

3.3V Power Supply for PLL

VSS_A

Ground

Ground for PLL

PS8734A 09/02/04

PI6C410

Clock Generator for Intel

PCI-Express Desktop Chipset

Functionality

Frequency Selection

FS_C

FS_B

FS_A

CPU

SRC

PCIF / PCI

REF

DOT_96

USB_48

Note

100MHz

33MHz

14.318MHz

96MHz

48MHz

133MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

166MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

200MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

266MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

333MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

400MHz

100MHz

33MHz

14.318MHz

96MHz

48MHz

Reserved

100MHz

33MHz

14.318MHz

96MHz

48MHz

Notes:

1. Refer to DC Electrical Characteristics for FS_A, FS_B and FS_C (Vih_FS, Vil_FS) threshold levels

Test Mode Selection

TEST_MODE

CPU

SRC

PCIF / PCI

REF

DOT_96

USB_48

Note

REF/N

REF

REF/N

Hi-Z

Notes:

2. Test mode will occur where the SMBus Bit 6 of Byte 6 = 1, or FS_C/TEST_SEL is set to logic high level.

PWRDWN Functionality

PWRDWN

CPU

CPU#

SRC

SRC#

PCIF /

PCI

REF

DOT_96 DOT_96# USB_48

Normal

33MHz 14.318MHz

Normal

48MHz

Iref × 2 or

Float

Iref × 2 or

Float

Low

Iref × 2 or

Float

Low

PS8734A 09/02/04

PI6C410

Clock Generator for Intel

PCI-Express Desktop Chipset

Serial Data Interface (SMBus)

PI6C410 is a slave only SMBus device that supports indexed block read and indexed block write protocol using a single 7-bit ad-

dress and read/write bit as shown below.

Address Assignment

R/W

1/0

Data Protocol

1 bit

7 bits

8 bits

1 bit

Start

bit

Slave Addr

R/W

Ack

offset

Ack

Byte

Count

= N

Ack

Data

Byte 0

Ack

...

Data

Byte N

- 1

Ack Stop

bit

Notes:

1. Register offset for indicating the starting register for indexed block write and indexed block read. Byte Count in write mode cannot be 0.

Data Byte 0: Control Register

Bit

Descriptions

Type

Power Up

Condition

Output(s) Affected

Pin

Source Pin

Reserved

SRC_1 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_1

19, 20

SRC_2 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_2

22, 23

SRC_3 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_3

24, 25

SRC_4 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_4

26, 27

SRC_5 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_5

30, 31

SRC_6 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

SRC_6

32, 33

CPU_2 / SRC_7 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

CPU_2 / SRC_7

35, 36

PS8734A 09/02/04

PI6C410

Clock Generator for Intel

PCI-Express Desktop Chipset

Data Byte 1: Control Register

Bit

Descriptions

Type

Power Up

Condition

Output(s) Affected

Pin

Source Pin

Spread Spectrum

1 = On, 0 = Off

0 = Spread off

CPU[0:2], SRC[1:7],

PCI[0:5], PCIF[0:2]

3, 4, 5, 8, 9, 10,

19, 20, 22, 23,

24, 25, 26, 27,

30, 31, 32, 33,

35, 36, 40, 41,

43, 44, 54, 55,

CPU_0 output enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

CPU_0, CPU_0#

43, 44

CPU_1 output enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

CPU_1, CPU_1#

40, 41

Reserved

REF Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

REF

USB_48 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

USB_48

DOT_96 Output Enable

1 = Enabled, 0 = Disabled (Hi-Z)

1 = Enabled

DOT_96 & DOT96#

14, 15

PCIF_0 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCIF_0

Data Byte 2: Control Register

Bit

Descriptions

Type

Power Up

Condition

Output(s) Affected

Pin

Source Pin

PCIF_1 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCIF_1

PCIF_2 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCIF_2

PCI_0 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_0

PCI_1 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_1

PCI _2 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_2

PCI _3 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_3

PCI _4 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_4

PCI _5 Output Enable

1 = Enabled, 0 = Disabled

1 = Enabled

PCI_5

Part Number PI6C410