1680C—08/26/10

9FG830

Eight Output Differential Frequency Generator for PCIe Gen3 and QPI

14

SMBus Table: Frequency Select Readback Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

SEL14M_25M#

1

(FS3)

State of pin 27

R

Pin 27

Bit 6

FS2

1

State of pin 6

R

Pin 6

Bit 5

FS1

1

State of pin 44

R

Pin 44

Bit 4

FS0

1

State of pin 45

R

Pin 45

Bit 3

SPREAD

1

State of pin 26

R

Off

On

Pin 26

Bit 2

R

X

Bit 1

R

X

Bit 0

R

X

Notes:

1. These bits reflect the state of the corresponding pins, regardless of whether software

programming is enabled or not.

SMBus Table: Vendor & Revision ID Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

RID3

R

-

-

X

Bit 6

RID2

R

-

-

X

Bit 5

RID1

R

-

-

X

Bit 4

RID0

R

-

-

X

Bit 3

VID3

R

-

-

0

Bit 2

VID2

R

-

-

0

Bit 1

VID1

R

-

-

0

Bit 0

VID0

R

-

-

1

SMBus Table: DEVICE ID

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

DEVID7

R

1

Bit 6

DEVID6

R

0

Bit 5

DEVID5

R

0

Bit 4

DEVID4

R

0

Bit 3

DEVID3

R

0

Bit 2

DEVID2

R

0

Bit 1

DEVID1

R

1

Bit 0

DEVID0

R

1

SMBus Table: Byte Count Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

BC7

RW

-

-

0

Bit 6

BC6

RW

-

-

0

Bit 5

BC5

RW

-

-

0

Bit 4

BC4

RW

-

-

0

Bit 3

BC3

RW

-

-

0

Bit 2

BC2

RW

-

-

1

Bit 1

BC1

RW

-

-

1

Bit 0

BC0

RW

-

-

1

Device ID = 83 hex

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Byte 3

6

27

45

44

See Frequency

Selection Table.

26

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Byte 4

-

REVISION ID

-

-

-

-

-

VENDOR ID

-

-

-

-

-

-

-

Byte 5

-

-

-

Byte 6

Writing to this register

will configure how many

bytes will be read back,

default is 07 = 7 bytes.

-

-

-

-

-

-

-

-