w83194br-323 Winbond Electronics Corp America, w83194br-323 Datasheet - Page 13

• Manufacturer Part Number: w83194br-323
• Description: Clock For Intel Chipsets
• Manufacturer: Winbond Electronics Corp America

7.10 Register 9: Spread Spectrum Programming Register
7.11 Register 10: Divisor and Step-less Enable and Skew Control Register
Table of CPU, 3V66, and PCI clock selection.
I2C Reg10 Definition
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
EN_MN_PROG
RATIO_SEL [3]
RATIO_SEL [2]
RATIO_SEL [1]
RATIO_SEL [0]
CPU_3V66_SKEW [2]
CPU_3V66_SKEW [1]
CPU_3V66_SKEW [0]
SP_UP [3]
SP_UP [2]
SP_UP [1]
SP_UP [0]
SP_DOWN [3]
SP_DOWN [2]
SP_DOWN [1]
SP_DOWN [0]
REG10
SSEL3
STEPLESS CLOCK FOR INTEL BROOKDALE CHIPSET
BIT6
0
0
0
0
0
0
NAME
NAME
PWD
0
0
0
1
1
1
1
1
Spread Spectrum Up Counter bit 3.
Spread Spectrum Up Counter bit 2.
Spread Spectrum Up Counter bit 1.
Spread Spectrum Up Counter bit 0
Spread Spectrum Down Counter bit 3
Spread Spectrum Down Counter bit 2
Spread Spectrum Down Counter bit 1
Spread Spectrum Down Counter bit 0
PWD
REG10
SSEL2
0
0
0
1
0
1
0
0
BIT5
0
0
0
0
1
1
0: use frequency table
1: use M/N register to program frequency
The equation is VCO freq. = 14.318MHz * (N+4)/ M. When the
watchdog timer is timeout, this will be clear. In this time, the
frequency is set to hardware default latched or safe frequency
set by EN_SFAE_FREQ (Register 0 bit 0).
CPU, 3V66, and PCI ratio selection. The ratio is shown as
following table.
CPU to 3V66 skew.
W83194BR-323/W83194BG-323
- 10 -
REG10
SSEL1
BIT4
DESCRIPTION
0
0
1
1
0
0
DESCRIPTION
REG10
SSEL0 RATIO RATIO RATIO
BIT3
0
1
0
1
0
1
CPU
2
2
3
4
4
6
3V66
5
6
6
6
8
6
PCI
10
12
12
12
16
12