Intel 815 Uživatelský manuál stáhnout pdf (Strana 39)

Universal Socket 370 Design

Intel

815 Chipset Platform Design Guide 39

4.2.9 APIC Clock Voltage Switching Requirements

The processor’s APIC clock is also specified at different voltage levels depending on whether it is

for the Pentium III processor (CPUID=068xh) / Celeron processor (CPUID=068xh) or whether it

is for a future 0.13 micron socket 370 processor. There is no overlap in the range of accepted

voltage levels for the two processor groups, so a voltage switch is required to ensure proper

operation. Figure 15 shows an example implementation.

Figure 15. Voltage Switch For APIC Clock from Clock Synthesizer to Processor

30 Ω

130 Ω

IOAPIC

APICCLK_CPU

TUAL5

MOSFET N

API_CLK_SW

NOTE: The 30 Ω resistor represents the series resistor typically used in connecting the APIC clock to the

processor.

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Intel 815 Uživatelský manuál Strana 39