2-OUTPUT CK420BQ DERIVATIVE

12

DECEMBER 12, 2016

9SQL4952 DATASHEET

SMBus Table: Output Enable Register

Byte 0

Name

Control Function

Type

0

1

Default

Bit 7

X

Bit 6

X

Bit 5

X

Bit 4

X

Bit 3

X

Bit 2

BCLK OE1

Output Enable

RW

Low/Low

Enabled

1

Bit 1

BCLK OE0

Output Enable

RW

Low/Low

Enabled

1

Bit 0

X

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

X

Bit 1

AMPLITUDE 1

RW

00 = 0.6V

01= 0.68V

1

Bit 0

AMPLITUDE 0

RW

10 = 0.75V

11 = 0.85V

0

SMBus Table: BCLK Slew Rate Control Register

Byte 2

Name

Control Function

Type

0

1

Default

Bit 7

X

Bit 6

X

Bit 5

X

Bit 4

X

Bit 3

X

Bit 2

SLEWRATESEL BCLK1

Adjust Slew Rate of BCLK1

RW

Slow Setting

Fast Setting

1

Bit 1

SLEWRATESEL BCLK0

Adjust Slew Rate of BCLK0

RW

Slow Setting

Fast Setting

1

Bit 0

X

Note: See "Low-Power HCSL Outputs" table for slew rates.

SMBus Table: REF Control Register

Byte 3

Name

Control Function

Type

0

1

Default

Bit 7

RW

00 = Slowest

01 = Slow

0

Bit 6

RW

10 = Fast

11 = Faster

1

Bit 5

REF Power Down Function

Wake-on-Lan Enable for REF

RW

REF disabled in

Power Down

REF runs in Power

Down

0

Bit 4

REF OE

REF Output Enable

RW

Enabled

1

Bit 3

X

Bit 2

X

Bit 1

X

Bit 0

X

1. The disabled state depends on Byte11[1:0]. '00' = Low, '01'=HiZ, '10'=Low, '11'=HIgh

Byte 4 is Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Slew Rate Control

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

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

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

REF

Reserved

Controls Output Amplitude

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

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

1. A low on these bits will overide the OE# pin and force the differential output to the state indicated by B11[1:0] (Low/Low default).

1. Spread must be selected OFF or ON with the hardware latch pin. These bits should not be used to turn spread ON or OFF after

power up. These bits can be used to change the spread amount, and B1[5] must be set to a 1 for these bits to have any effect on the

part. If These bits are used to turn spread OFF or ON, the system will need to be reset.