PI6C104H Просмотр технического описания (PDF) - Pericom Semiconductor
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PI6C104H Datasheet PDF : 14 Pages
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PI6C104
Spread Spectrum Clock Synthesizer
for Desktop Pentium II 111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222333444555666777888999000111222333444555666777888999000111222111222333444555666777888999000111222
Byte 6 : REF Clock Control (1 = Enabled, 0 = Disabled)
Bit # Pup
Pin #
Name
Description
7
~
RSVD Reserved
6
0
5
~
RSVD Reserved
24
APICEN APIC Enable, Default is Enable
4
~
RSVD Reserved
2
~
RSVD Reserved
1
1
26
RFEN1 REF1 High drive Enable 1
0
26
RFEN0 REF1 High drive Enable 0
RFEN1 RFEN0
0
0
Low Drive
0
1
Normal Drive, Default
1
0
High Drive
1
1
Note: Outputs are disabled @ low state
Table 1: Byte 3 Frequency and Spread Spectrum Table
Bit3 SFS Bit1 SSEN Bit6 S0 Bit5 S1 Bit4 S2 CPU(MHz) PCI(MHz)
1
0
0
0
0
75
30
1
0
0
0
1
66.8
33.4
1
0
0
1
0
66.6
33.3
1
0
0
1
1
66.8
33.4
1
0
1
0
0
112
37.3
1
0
1
0
1
83.3
33.3
1
0
1
1
0
100
33.3
1
0
1
1
1
100
33.3
1
1
0
0
0
75
30
1
1
0
0
1
66.8
33.4
1
1
0
1
0
66.6
37.3
1
1
0
1
1
66.8
33.4
1
1
1
0
0
112
37.3
1
1
1
0
1
83.3
33.3
1
1
1
1
0
100
33.3
1
1
1
1
1
100
33.3
Spread (%)
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
-0.5~+0.5
-0.9~+0.9
-1.0~+0.0
-0.5~+0.5
-0.5~+0.5
-0.5~+0.5
-1~+0.0
-0.5~+0.0
Notes:
Bit 3 = Enable Software
Frequency Select
Bit 1 = Enable Software
Frequency Select
Bit 6 = Frequency Select 0
Bit 5 = Frequency Select 1
Bit 4 = Frequency Select 0
Byte 0: Test Mode Table
Bit 1 Bit 0 CPU
PCI
0
0
table 1
table 1
0
1
Xin/2
Xin/6
1
0
table 1
table 1
1
1
Hi-Z
Hi-Z
48M
48MHz
Xin/2
48MHz
Hi-Z
24M
24 MHz/Ref
Xin/4
24 MHz/Ref
Hi-Z
REF/APIC
14.318MHz
Xin
14.318MHz
Hi-Z
Mode
Normal
Test
SSC
Tri-state
238
PS8164B 03/15/99
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