W83194R-81 Datasheet, PDF (9/18 Pages) Winbond – 100MHZ CLOCK FOR SIS CHIPSET

W83194R-81
PRELIMINARY
8.3.1 Register 0: CPU Frequency Select Register
Bit @PowerUp
7
0
6
0
5
0
4
0
3
0
2
0
Pin
Description
-
0 = ¡Ó0.25% Spread Spectrum Modulation
1 = ¡Ó0.5% Spread Spectrum Modulation
-
SSEL2 ( Frequency table selection by software via I²C)
-
SSEL1 ( Frequency table selection by software via I²C)
-
SSEL0 ( Frequency table selection by software via I²C)
-
0 = Selection by hardware
1 = Selection by software I²C - Bit 6:4 and Bit2
-
SSEL3 (Frequency table selection by software via I²C )
1
0
-
0 = Normal
1 = Spread Spectrum enabled
0
0
-
0 = Running
1 = Tristate all outputs
Frequency table selection by software via I²C
SSEL3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
SSEL2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
SSEL1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
SSEL0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPU
(MHz)
66.70
90
95.25
100.2
100
112
124
133.3
66.8
75
83.3
95.25
100.2
112
124
133.3
SDRAM
(MHz)
100.05
90
63.4
66.8
75
74.7
82.7
88.9
66.8
75
83.3
95.25
100.2
112
124
133.3
PCI
(MHz)
33.35
30
31.7
33.4
30
37.3
31
33.3
33.4
30
33.32
31.7
33.4
37.3
31
33.3
REF (MHz)
IOAPIC
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
Publication Release Date: Dec. 1998
-9-
Revision 0.20