IDT®

Four Output Differential Buffer for PCIe Gen 1 and Gen 2

ICS9DB403D

REV R 11/1/12

ICS9DB403D

Four Output Differential Buffer for PCIe for Gen 1 and Gen 2

12

SMBus Table: Frequency Select Register, READ/WRITE ADDRESS (DC/DD)

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

PD_Mode

PD# drive mode

RW

driven

Hi-Z

0

Bit 6

STOP_Mode

DIF_Stop# drive mode

RW

driven

Hi-Z

0

Bit 5

Reserved

Reserved

RW

X

Bit 4

Reserved

Reserved

RW

X

Bit 3

Reserved

Reserved

RW

X

Bit 2

PLL_BW#

Select PLL BW

RW

High BW

Low BW

1

Bit 1

BYPASS#

BYPASS#/PLL

RW

fan-out

ZDB

1

Bit 0

SRC_DIV#

SRC Divide by 2 Select

RW

x/2

1x

1

SMBus Table: Output Control Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

Reserved

Reserved

RW

1

Bit 6

DIF_6

Output Enable

RW

Disable

Enable

1

Bit 5

DIF_5

Output Enable

RW

Disable

Enable

1

Bit 4

Reserved

Reserved

RW

1

Bit 3

Reserved

Reserved

RW

1

Bit 2

DIF_2

Output Enable

RW

Disable

Enable

1

Bit 1

DIF_1

Output Enable

RW

Disable

Enable

1

Bit 0

Reserved

Reserved

RW

1

NOTE: The SMBus Output Enable Bit must be '1' AND the respective OE pin must be active for the output to run!

SMBus Table: OE Pin Control Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

Reserved

Reserved

RW

0

Bit 6

DIF_6

DIF_6 Stoppable with DIFSTOP

RW

Free-run

Stoppable

0

Bit 5

DIF_5

DIF_5 Stoppable with DIFSTOP

RW

Free-run

Stoppable

0

Bit 4

Reserved

Reserved

RW

0

Bit 3

Reserved

Reserved

RW

0

Bit 2

DIF_2

DIF_2 Stoppable with DIFSTOP

RW

Free-run

Stoppable

0

Bit 1

DIF_1

DIF_1 Stoppable with DIFSTOP

RW

Free-run

Stoppable

0

Bit 0

Reserved

Reserved

RW

0

SMBus Table: Reserved Register

Pin #

Name

Control Function

Type

0

1

Default

Bit 7

X

Bit 6

X

Bit 5

X

Bit 4

X

Bit 3

X

Bit 2

X

Bit 1

X

Bit 0

X

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

-

Reserved

-

-

-

Byte 2

-

-

9,10

-

22,23

Reserved

Reserved

-

Byte 1

-

22,23

Reserved

6,7

19,20

9.1

-

-

Byte 0

-

-

-

-

19,20

6,7

-

Byte 3

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved