Intel Pentium III Processor 512K Design Manual page 43

Table 24. Miscellaneous Signals
CPU Pin
BSEL0 (AE12)
BSEL1 (AF10)
THERMDN (AF14)
THERMDP (AF13)
NCHCTRL (AD16)
RTTCTRL (AE16)
SLEWCTRL (AF16)
VID[3:0]
VID25 (R3)
Design Guide
® ®
LV Intel Pentium III Processor 512K Dual Processor Platform
The table below shows the encoding scheme for BSEL[1:0]. The only supported
system bus frequency for the LV Intel
133 MHz. If another frequency is used, the processor is not guaranteed to
function properly.
System
BSEL[1:0]
Bus
11 133 MHz
See Figure 15 for details.
Thermal diode cathode. Connect to thermal sensor device.
Thermal diode anode. Connect to thermal sensor device.
through a 14 Ω 1% resistor.
Connect to V
TT
68 Ω 1% pull-down to GND.
110 Ω 1% pull-down to GND.
Each VID line must be pulled up to 3.3 V through a 1 KΩ resistor. These resistors
can be either internal to the voltage regulator controller or placed externally on
the motherboard.
Each VID line must be pulled up to 3.3 V through a 1 KΩ resistor. These resistors
can be either internal to the voltage regulator controller or placed externally on
the motherboard.
Pin Connection
® ®
III
Pentium Processor 512K (1.15 V) is
Pin Connection
For single ended clocking pull both signals up to
3.3 V with a 1 KΩ resistor at the clock generator.
NC on processor 0 and 1.
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