9FGV0231

2-OUTPUT VERY LOW POWER PCIE GEN1-2-3 CLOCK GENERATOR

IDT®

2-OUTPUT VERY LOW POWER PCIE GEN1-2-3 CLOCK GENERATOR

10

9FGV0231

REV C 020315

SMBus Table: Output Enable Register

Byte 0

Name

Control Function

Type

0

1

Default

Bit 7

1

Bit 6

1

Bit 5

1

Bit 4

1

Bit 3

1

Bit 2

DIF OE1

Output Enable

RW

Low/Low

Enabled

1

Bit 1

DIF OE0

Output Enable

RW

Low/Low

Enabled

1

Bit 0

1

SMBus Table: SS Readback and Vhigh Control Register

Byte 1

Name

Control Function

Type

0

1

Default

Bit 7

SSENRB1

SS Enable Readback Bit1

R

Latch

Bit 6

SSENRB1

SS Enable Readback Bit0

R

Latch

Bit 5

SSEN_SWCNTRL

Enable SW control of SS

RW

SS control locked

Values in B1[4:3]

control SS amount.

0

Bit 4

SSENSW1

SS Enable Software Ctl Bit1

0

Bit 3

SSENSW0

SS Enable Software Ctl Bit0

0

Bit 2

1

Bit 1

AMPLITUDE 1

RW

00 = 0.6V

01 = 0.7V

1

Bit 0

AMPLITUDE 0

RW

10= 0.8V

11 = 0.9V

0

1. B1[5] must be set to a 1 for these bits to have any effect on the part.

SMBus Table: DIF Slew Rate Control Register

Byte 2

Name

Control Function

Type

0

1

Default

Bit 7

1

Bit 6

1

Bit 5

1

Bit 4

1

Bit 3

1

Bit 2

SLEWRATESEL DIF1

Adjust Slew Rate of DIF1

RW

2.0V/ns

3.0V/ns

1

Bit 1

SLEWRATESEL DIF0

Adjust Slew Rate of DIF0

RW

2.0V/ns

3.0V/ns

1

Bit 0

1

SMBus Table: REF Control Register

Byte 3

Name

Control Function

Type

0

1

Default

Bit 7

RW

00 = 0.9V/ns

01 =1.3V/ns

0

Bit 6

RW

10 = 1.6V/ns

11 = 1.8V/ns

1

Bit 5

REF Power Down Function

Wake-on-Lan Enable for REF

RW

REF does not run in

Power Down

REF runs in Power

Down

0

Bit 4

REF OE

REF Output Enable

RW

Low

Enabled

1

Bit 3

1

Bit 2

1

Bit 1

1

Bit 0

1

Byte 4 is reserved and reads back 'hFF'.

Reserved

Reserved

Slew Rate Control

00' = SS Off, '01' = -0.25% SS,

'10' = Reserved, '11'= -0.5% SS

00' for SS_EN_tri = 0, '01' for SS_EN_tri

= 'M', '11 for SS_EN_tri = '1'

REF

Reserved

Controls Output Amplitude

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved