9LPRS477D

PROGRAMMABLE SYSTEM CLOCK CHIP FOR ATI RD790-K8TM BASED SYSTEMS

IDT®

PROGRAMMABLE SYSTEM CLOCK CHIP FOR ATI RD790-K8TM BASED SYSTEMS

16

9LPRS477D

REV C 010715

SMBUS Table: SRC PLL DOC 1 N programming Register (1 pin control : DOC = 1; 2 pin control : DOC [0:1] = 01)

Byte

38

Name

Control Function

Type

0

1

Default

Bit 7

N Div10

RW

X

Bit 6

N Div9

RW

X

Bit 5

N Div8

RW

X

Bit 4

N Div7

RW

X

Bit 3

N Div6

RW

X

Bit 2

N Div5

RW

X

Bit 1

N Div4

RW

X

Bit 0

N Div3

RW

X

SMBUS Table: SRC PLL DOC 2 N programming Register (1 pin control : DOC = 1; 2 pin control : DOC [0:1] = 10)

Byte

39

Name

Control Function

Type

0

1

Default

Bit 7

N Div10

RW

X

Bit 6

N Div9

RW

X

Bit 5

N Div8

RW

X

Bit 4

N Div7

RW

X

Bit 3

N Div6

RW

X

Bit 2

N Div5

RW

X

Bit 1

N Div4

RW

X

Bit 0

N Div3

RW

X

SMBUS Table: SRC PLL DOC 3 N programming Register (1 pin control : DOC = 1; 2 pin control : DOC [0:1] = 11)

Byte

40

Name

Control Function

Type

0

1

Default

Bit 7

N Div10

RW

X

Bit 6

N Div9

RW

X

Bit 5

N Div8

RW

X

Bit 4

N Div7

RW

X

Bit 3

N Div6

RW

X

Bit 2

N Div5

RW

X

Bit 1

N Div4

RW

X

Bit 0

N Div3

RW

X

SMBus Table: ATIG PLL Spread Spectrum Control Register

Byte

41

Name

Control Function

Type

0

1

Default

Bit 7

SSP7

RW

X

Bit 6

SSP6

RW

X

Bit 5

SSP5

RW

X

Bit 4

SSP4

RW

X

Bit 3

SSP3

RW

X

Bit 2

SSP2

RW

X

Bit 1

SSP1

RW

X

Bit 0

SSP0

RW

X

SMBus Table: ATIG PLL Spread Spectrum Control R egister

Byte

42

Name

Control Function

Type

0

1

Default

Bit 7

SSP15

RW

X

Bit 6

SSP14

RW

X

Bit 5

SSP13

RW

X

Bit 4

SSP12

RW

X

Bit 3

SSP11

RW

X

Bit 2

SSP10

RW

X

Bit 1

SSP9

RW

X

Bit 0

SSP8

RW

X

Spread Spectrum P rogramming

b(7:0)

These bi ts set the ATIG spread pecentage.Please contact IDT for

the appropriate values.

Spread Spectrum P rogramming

b(15:8)

These bi ts set the ATIG spread pecentage.Please contact IDT for

the appropriate values.

N Divider Programming Byte20

bit(7:0) and Byte19 bit(7:6)

The decimal representation of M and N Divider in Byte 21 and 37 will

configure the VCO frequency. Default at power up = Byte 4 Rom

table. See M/N Caculation Tables for VCO frequency formulas.

N Divider Programming Byte20

bit(7:0) and Byte19 bit(7:6)

The decimal representation of M and N Divider in Byte 21 and 38 will

configure the VCO frequency. Default at power up = Byte 4 Rom

table. See M/N Caculation Tables for VCO frequency formulas.

N Divider Programming Byte20

bit(7:0) and Byte19 bit(7:6)

The decimal representation of M and N Divider in Byte 21 and 39 will

configure the VCO frequency. Default at power up = Byte 4 Rom

table. See M/N Caculation Tables for VCO frequency formulas.