9

PS8820

02/28/06

PI6C21200

1:12 Clock Driver for Intel

PCI-Express Chipsets

Programmable Gear Ratio - Output Frequency -- Continued

FS_A

SMBus Byte 0

Input

Output

Gear

Ratio

CPU Input Frequency (MHz)

Bit 3

Bit 2

Bit 1

Bit 0

M

N

(N/M)

100

133.3

160

166.67

200

1

0

0

0

0

3

1

0.333

NA

NA

53.3

55.6

66.7

1

0

0

0

1

5

2

0.400

NA

53.3

64.0

66.7

80.0

1

0

0

1

0

12

5

0.417

NA

55.6

66.7

69.4

83.3

1

0

0

1

1

2

1

0.500

50.0

66.7

80.0

83.3

100.0

1

0

1

0

0

5

3

0.600

60.0

80.0

96.0

100.0

120.0

1

0

1

0

1

8

5

0.625

62.5

83.3

100.0

104.2

NA

1

0

1

1

0

3

2

0.667

66.7

88.9

106.7

111.1

133.3

1

0

1

1

1

5

4

0.800

80.0

106.7

128.0

133.3

160.0

1

1

0

0

0

6

5

0.833

NA

111.1

133.3

138.9

166.7

1

1

0

0

1

1

1

1.000

100.0

133.3

160.0

166.7

200.0

1

1

0

1

0

5

6

1.200

120.0

160.0

192.0

200.0

240.0

1

1

0

1

1

4

5

1.250

125.0

166.7

200.0

208.3

NA

1

1

1

0

0

3

4

1.333

133.3

177.8

213.3

222.2

266.7

1

1

1

0

1

2

3

1.500

150.0

200.2

240.0

250.0

300.0

1

1

1

1

0

3

5

1.667

166.7

222.2

266.7

277.8

333.3

1

1

1

1

1

1

2

2.000

200.0

266.7

320.0

333.3

400.0

Note:

1. Line in BOLD is power-up default for FS_A = 0 for Pericom Semiconductor's PI6C410B.

Functionality

VTT_PWRGD#

/ PWRDWN

OUT

OUT#

0

Normal

Normal

1

Low

OE#

pin

OE

(SMBus bit)

OUT

OUT#

0

1

Normal

Normal

0

0

Hi-Z

Hi-Z

1

1

Hi-Z

Hi-Z

1

0

Hi-Z

Hi-Z