Datasheet

Datasheet 19
Electrical Specifications
NOTES:
1. 0 = Processor pin connected to V
SS.
2. 1 = Open on processor; may be pulled up to TTL V
IH
on baseboard.
3. To ensure a system is ready for the Pentium III processor, the values in BOLD in Table 3 should be
supported.
Note that the ‘11111’ (all opens) ID can be used to detect the absence of a processor core in a given
connector as long as the power supply used does not affect these lines. Detection logic and pull-ups
should not affect VID inputs at the power source (see Section 7.0).
The VID pins should be pulled up to a TTL-compatible level with external resistors to the power
source of the regulator only if required by the regulator or external logic monitoring the VID[4:0]
signals. The power source chosen must be guaranteed to be stable whenever the supply to the
Table 3. Voltage Identification Definition
Processor Pins
Notes
1,2
VID4 VID3 VID2 VID1 VID0 Vcc
CORE
011111.30
011101.35
011011.40
011001.45
010111.50
010101.55
010011.60 3
010001.65 3
001111.70 3
001101.75 3
001011.80 3
001001.85 3
000111.90 3
000101.95 3
000012.00 3
000002.05 3
11111No Core
111102.1
111012.2
111002.3
110112.4
110102.5
110012.6
110002.7
101112.8
101102.9
101013.0
101003.1
100113.2
100103.3
100013.4
100003.5