4

ICS9148-47

Note: PWD = Power-Up Default

Byte 3: Functionality & Frequency Select

& Spread Slect Register

Notes: 1 = Enabled; 0 = Disabled, outputs held low

Bit

Description

PWD

7(Reserved)

0

6:4

Bit

654

CPU

PCI

Spread

Percentage

000

001

010

011

100

101

110

111

68.5

75.0

83.3

66.6

103

112

133.3

100

34.25

37.5

41.6

33.3

34.3

37.3

44.43

33.33

±0.5% Center

±0.5% Center

±0.5% Center

±0.5% Center

±0.5% Center

±0.5% Center

±0.5% Center

±0.5% Center

0

3

0 - Frequency is selected by hardware select

SEL100/66.6#

1 - Frequency is selected by 6:4 above

0

2(Reserved)

10

00 - Normal operation

01 - Test mode

10 - Spread sprectrum ON

11 - Tristate all outputs

00

Byte 4:

Notes: 1 = Enabled; 0 = Disabled, outputs held low

Bit

Pin#

Pin Name

PWD

Description

Bit Value = 0

Bit Value = 1

7

-

-

-

(Reserved)

(Reserved)

6

-

-

-

(Reserved)

(Reserved)

5

-

-

-

(Reserved)

(Reserved)

4

-

-

-

(Reserved)

(Reserved)

3

-

-

-

(Reserved)

(Reserved)

221

CPUCLK1

1

Disabled

(low)

Enabled

1

-

-

0

(Reserved)

(Reserved)

022

CPUCLK0

1

(Disabled)

(low)

Enabled

Byte 5:

Notes: 1 = Enabled; 0 = Disabled, outputs held low

Bit

Pin#

Pin Name

PWD

Description

Bit Value = 0

Bit Value = 1

74

PCICLK_F

1

Disabled

(low)

Enabled

6

11

PCICLK5

1

Disabled

(low)

Enabled

5

10

PCICLK4

1

Disabled

(low)

Enabled

4

-

-

0

(Reserved)

(Reserved)

38

PCICLK3

1

Disabled

(low)

Enabled

27

PCICLK2

1

Disabled

(low)

Enabled

16

PCICLK1

1

Disabled

(low)

Enabled

05

PCICLK0

1

Disabled

(low)

Enabled

Serial Bitmap

Byte 6:

Notes:

1 = Enabled; 0 = Disabled, outputs held low

For pin 27, there are 2 output stages together for 1 pin. These 2

latches must be both 0 or 1 simultaneously or there will be a short to

ground if one is disabled and the other is running.

Bit

Pin#

Pin Name

PWD

Description

Bit Value = 0

Bit Value = 1

7

-

-

0

(Reserved)

(Reserved)

6

-

-

0

(Reserved)

(Reserved)

524

IOAPIC

1

Disabled

(low)

Enabled

4

-

-

0

(Reserved)

(Reserved)

3

-

-

0

(Reserved)

(Reserved)

2

-

-

0

(Reserved)

(Reserved)

127

REF0

1

(Disabled)

(low)

Enabled

027

REF0

1

(Disabled)

(low)

Enabled