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

• Manufacturer Part Number: w83194br-pt
• Description: Stepless Via Pt Main Clock Generator
• Manufacturer: Winbond Electronics Corp America

7.10 Register 10: M/N Program (Default = 67h)
7.11 Register 11: Spread Spectrum Programming (Default = 1Fh)
7.12 Register 12: Divisor and Step-less Enable Control (Default = 08h)
BIT
BIT
BIT
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
EN_MN_PROG
RATIO_SEL [4]
RATIO_SEL [3]
RATIO_SEL [2]
RATIO_SEL [1]
RATIO_SEL [0]
SP_DOWN [3]
SP_DOWN [2]
SP_DOWN [1]
SP_DOWN [0]
SP_UP [3]
SP_UP [2]
SP_UP [1]
SP_UP [0]
Reserved
N_DIV [7]
N_DIV [6]
N_DIV [5]
N_DIV [4]
N_DIV [3]
N_DIV [2]
N_DIV [1]
N_DIV [0]
TEST0
NAME
NAME
NAME
PWD
PWD
PWD
0
0
0
1
1
1
1
1
0
0
0
0
1
0
0
0
0
1
1
0
0
1
1
1
Spread Spectrum Up Counter bit 3 ~ bit 0.
Spread Spectrum Down Counter bit 3 ~ bit 0
2’s complement representation.
Ex: 1 -> 1111; 2 -> 1110; 7 -> 1001; 8 -> 1000
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, PCI, AGP, ratio selection. The ratio is shown as following table.
Test bit 0. Winbond test bit, do not change them.
Programmable N divisor value bit 7 ~0. The bit 8 is defined in Register
9.
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DESCRIPTION
DESCRIPTION
DESCRIPTION
W83194BR-PT