Chapter 3 Configuring the AI5TV
12 AI5TV Motherboard User’s Manual
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 CPU Type Vcore V
IO
ON ON
Intel Pentium (P54C)
Cyrix 6x86, AMD K5
3.5V 3.5V
OFF OFF
Intel Pentium MMX (P55C)
Cyrix 6x86L, AMD K6
2.8V 2.8V
SW3, SW5, SW6, SW7, SW8: CPU Frequency Select
For Intel CPUs
SW3 SW5 SW6 SW7 SW8
Bus
Clock
Multiplie
r
CPU
ON OFF OFF ON ON 50MHz 1.5x P54C-75
ON OFF OFF ON OFF 60MHz 1.5x P54C-90
ON OFF OFF OFF ON 66MHz 1.5x P54C-100
ON OFF ON ON OFF 60MHz 2.0x P54C-120
ON OFF ON OFF ON 66MHz 2.0x P54C-133
ON ON ON ON OFF 60MHz 2.5x P54C-150
ON ON ON OFF ON 66MHz 2.5x P54C/P55C-166
ON ON OFF OFF ON 66MHz 3.0x P54C/P55C- 200
ON OFF OFF OFF ON 66MHz 3.5x P55C-233
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