Asus SP97 User Manual - Page 17

ASUS SP97 / SP97-V User's Manual, CPU External Frequency BUS Selection FS0, FS1, FS2, FS3, CPU

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III. INSTALLATION 3. CPU External Frequency (BUS) Selection (FS0, FS1, FS2, FS3) These jumpers tell the clock generator what frequency to send to the CPU. These allow the selection of the CPU's external frequency (or BUS Clock). The BUS Clock multiplied by the BUS Ratio equals the CPU's internal frequency (the advertised CPU speed). When BUS Frequency is set to 75MHz or more, the PCI Frequency Selector (FS3) must be set to asynchronous PCI mode to maintain PCI signal stability. 4. CPU to BUS Frequency Ratio (BF0, BF1, BF2) These jumpers set the frequency ratio between the internal frequency of the CPU and the external frequency (called the BUS Clock) within the CPU. These must be set together with the jumpers for CPU External (BUS) Frequency Selection. BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 BF2 BF1 BF0 R 1 2 3 P54C/K5 1.5x(3/2) 2.0x(2/1) 2.5x(5/2) 3.0x(3/1) ---- ---- P55C/K6/MX 3.5x(7/2) 2.0x(2/1) 2.5x(5/2) 3.0x(3/1) 4.0x(4/1) 4.5x(9/2) IBM/Cyrix 6x86 3.0x(3/1) 2.0x(2/1) 1.0x(1/1) 4.0x(4/1) ---- ---- CPU : BUS Frequency Ratio FS3 1 2 3 FS3 1 2 3 FS3 1 2 3 FS3 1 2 3 1 FS0 1 FS0 1 FS0 1 FS0 2 FS1 2 FS1 2 FS1 2 FS1 Complete Names: 3 FS2 3 FS2 3 FS2 3 FS2 Intel Pentium P54C, P55C-MMX Sync AMD K5, K6 50MHz Sync 60MHz Sync 66MHz ASync 75MHz IBM/Cyrix 6x86(M1), 6x86MX(M2) CPU External Clock (BUS) Frequency Selection III. INSTALLATION (Jumpers) ASUS SP97 / SP97-V User's Manual 17

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ASUS SP97 / SP97-V User’s Manual
17
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3.
CPU External Frequency (BUS) Selection (FS0, FS1, FS2, FS3)
These jumpers tell the clock generator what frequency to send to the CPU. These allow
the selection of the CPU’s
external
frequency (or
BUS Clock
). The BUS Clock multi-
plied by the BUS Ratio equals the CPU’s
internal
frequency (the advertised CPU speed).
When BUS Frequency is set to 75MHz or more, the PCI Frequency Selector
(FS3) must be set to asynchronous PCI mode to maintain PCI signal stability.
4.
CPU to BUS Frequency Ratio (BF0, BF1, BF2)
These jumpers set the frequency ratio between the
internal
frequency of the CPU
and the
external
frequency (called the
BUS Clock
) within the CPU. These must be
set together with the jumpers for
CPU External (BUS) Frequency Selection.
CPU External Clock (BUS) Frequency Selection
CPU : BUS Frequency Ratio
P54C/K5
P55C/K6/MX
IBM/Cyrix 6x86
1
2
3
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
IBM/Cyrix 6x86(M1), 6x86MX(M2)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
BF1
BF2
BF0
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
BF1
BF2
BF0
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
BF1
BF2
BF0
3.0x(3/1)
3.0x(3/1)
4.0x(4/1)
BF1
BF2
BF0
----
4.5x(9/2)
----
BF1
BF2
BF0
----
4.0x(4/1)
----
BF1
BF2
BF0
75MHz
1
2
3
FS1
FS0
FS2
FS3
1
2
3
66MHz
1
2
3
FS1
FS0
FS2
FS3
1
2
3
60MHz
1
2
3
FS1
FS0
FS2
FS3
1
2
3
50MHz
FS1
FS0
FS2
1
2
3
FS3
1
2
3
Sync
Sync
Sync
ASync