AOpen AP5T-TBL User Manual
Appendix A
Jumper Table Summary
Setting the CPU Voltage
JP11
1-2
3-4
5-6
7-8
9-10
11-12
CPU Core Voltage (Vcore)
3.45V (Intel P54C or IDT C6)
3.52V (Cyrix or AMD K5)
2.9V (AMD K6-166/200 or Cyrix M2)
2.8V (MMX P55C)
3.2V (AMD K6-233)
2.5V/2.2V/2.0V (Reserved)
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.
Tip: JP11 pin 11-12 is reserved for future CPU, the most
possible value is 2.0V. It is not yet decided when this manual
is printed. Use voltage meter or check your distributor before
you use pin 11-12.
CPU Type JP11 Vcore
A-1
Jumper Table Summary
INTEL P54C Single Voltage 1-2 3.45V
INTEL MMX
P55C
AMD K5 Single Voltage 3-4 3.52V
AMD K6-166/200 Dual Voltage 5-6 2.9V
AMD K6-233 Dual Voltage 9-10 3.2V
Cyrix 6x86 Single Voltage 3-4 3.52V
Cyrix 6x86L Dual Voltage 7-8 2.8V
Cyrix M2 Dual Voltage 5-6 2.9V
IDT C6 Single Voltage 1-2 3.45V
Selecting the CPU Frequency
JP3
JP1
1-2
1-2
1-2
2-3
1-2
2-3
1-2
1-2
2-3
2-3
2-3
2-3
2-3
1-2
2-3
1-2
Dual Voltage 7-8 2.8V
JP2
CPU Frequency
Ratio
1-2
1.5x (3.5x)
1-2
2x
2-3
2.5x (1.75x)
2-3
3x
1-2
4x
2-3
4.5x
2-3
5x
1-2
5.5x
JP6
1-2
1-2
2-3
2-3
JP4
1-2
2-3
1-2
2-3
JP5
2-3
1-2
2-3
1-2
CPU External
Clock
60MHz
66MHz
75MHz
83.3MHz
Note: JP3 is reserved for future CPU. It is NC pin (no connection)
for current CPU on the market. It should be no harm to connect to
1-2 or 2-3. If you find any unstable problem, please try to remove
the jumper cap, and leave it Open.
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.
INTEL CPU Core Ratio External JP3 & JP1 & JP2 JP6 & JP4 & JP5
A-2
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