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TMC AI5TV User Manual: Sw3, Sw5, Sw6, Sw7, Sw8: Cpu Frequency Select

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Chapter 3 Configuring the AI5TV
SW1: AT Bus Clock Select
Use this DIP-Switch to select the frequency of the AT bus clock
(ATCLK). The ATCLK is derived from the PCI clock (PCLK) as
PCLK/3 or PCLK/4 and the PCLK is derived from the CPU clock
(CLK) as CLK/2.
For example, for a Pentium 100MHz system, the CLK would be
66MHz so the PCLK/2 equals to 33MHz. You would set SW1 as
PCLK/4 where ATCLK would be 8.3MHz.
SW1
AT Clock
OFF
PCI Clock/3
ON
PCI Clock/4 (Default setting)
SW2: CPU Voltage Select
SW2
JP25
ON
ON
OFF
OFF

SW3, SW5, SW6, SW7, SW8: CPU Frequency Select

SW3 SW5 SW6 SW7 SW8
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
OFF
12
CPU Type
Intel Pentium (P54C)
Cyrix 6x86, AMD K5
Intel Pentium MMX (P55C)
Cyrix 6x86L, AMD K6
For Intel CPUs
Clock
ON
ON
50MHz
ON
OFF
60MHz
OFF
ON
66MHz
ON
OFF
60MHz
OFF
ON
66MHz
ON
OFF
60MHz
OFF
ON
66MHz
OFF
ON
66MHz
OFF
ON
66MHz
AI5TV Motherboard User's Manual
Vcore
3.5V
2.8V
Bus
Multiplie
r
1.5x
1.5x
1.5x
2.0x
2.0x
2.5x
2.5x
3.0x
3.5x
V
IO
3.5V
2.8V
CPU
P54C-75
P54C-90
P54C-100
P54C-120
P54C-133
P54C-150
P54C/P55C-166
P54C/P55C- 200
P55C-233

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