W83194R-81 データシートの表示（PDF） - Winbond
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W83194R-81 Datasheet PDF : 18 Pages
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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
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