AOpen P5TC-TBL User Manual
Appendix C
Jumper Table Summary
Setting the CPU Voltage
S4
ON
OFF
OFF
ON
OFF
OFF
OFF
S5
ON
ON
OFF
OFF
OFF
ON
ON
S6
ON
ON
ON
OFF
OFF
OFF
OFF
S7
ON
ON
ON
ON
ON
OFF
ON
S8
OFF
OFF
OFF
OFF
OFF
OFF
ON
CPU Core Voltage
3.52V (Cyrix 6x86 or AMD K5)
3.45V (Intel P54C or IDT C6)
3.2V (AMD K6-233)
2.9V (K6-166/200 or M2)
2.8V (Intel P55C)
2.2V (AMD K6-266/300)
1.8V (For future use)
JP12
1-2
3-4
CPU Type S4 S5 S6 S7 S8 Vcore
I/O Voltage (Vio)
3.45V (default)
3.52V
Warning: Please make sure that you have installed CPU fan
properly if Intel PP/MT-233 or AMD K6-200/233 is being
selected to use. It may cause your system unstable if you can
not meet the heat dissipation requirement from above CPU type.
It is recommended to adopt larger fan on these CPU for better
air flow in the system.
Tip: Normally, for single voltage CPU, Vcpuio (CPU I/O Voltage)
is equal to Vcore, but for CPU that needs dual voltage such as
PP/MT (P55C) or Cyrix 6x86L, Vcpuio is different from Vcore
and must be set to Vio (PBSRAM and Chipset Voltage). The
single or dual voltage CPU is automatically detected by
hardware circuit.
C-1
Jumper Table Summary
INTEL P54C Single Voltage OFF ON ON ON OFF 3.45V
INTEL MMX P55C Dual Voltage OFF OFF OFF ON OFF 2.8V
AMD K5 Single Voltage ON ON ON ON OFF 3.52V
AMD K6-166/200 Dual Voltage ON OFF OFF ON OFF 2.9V
AMD K6-233 Dual Voltage OFF OFF ON ON OFF 3.2V
AMD K6-266/300 Dual Voltage OFF ON OFF OFF OFF 2.2V
Cyrix 6x86 Single Voltage ON ON ON ON OFF 3.52V
Cyrix 6x86L Dual Voltage OFF OFF OFF ON OFF 2.8V
Cyrix M2 Dual Voltage ON OFF OFF ON OFF 2.9V
IDT C6 Single Voltage OFF ON ON ON OFF 3.45V
Selecting the CPU Frequency
S1
S2
S3
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
CPU Frequency
Ratio
1.5x (3.5x)
2x
2.5x (1.75x)
3x
4x
4.5x
5x
JP4
1-2
2-3
1-2
2-3
JP5
2-3
1-2
2-3
1-2
JP6
1-2
1-2
2-3
2-3
CPU External
Clock
60MHz
66MHz
75MHz
83.3MHz
INTEL
Pentium
C-2
Note: Intel PP/MT MMX 233MHz is using 1.5x jumper setting for
3.5x frequency ratio, and AMD PR166 is using 2.5x setting for
1.75x frequency ratio.
Warning: INTEL TX chipset supports only 60/66MHz external
CPU bus clock, the 75/83.3MHz settings are for internal test only,
set to 75/83.3MHz exceeds the specification of TX chipset,
which may cause serious system damage.
Warning: Cyrix 6x86 P200+ uses 75MHz external clock, the
jumper setting shown on the table below is for user's convenient.
It may cause serious system damage to use 75MHz clock.
Warning: Although you may set 75MHz x 2 for Cyrix MX-PR200
and 83.3MHz x 2 for Cyrix MX-PR233, note that 75/83.3MHz
settings may probably cause serious system damage.
CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4 & JP5 & JP6
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