Intel SL2YM Datasheet download pdf (Page 16)

Pentium

II Processor at 350 MHz, 400 MHz, and 450 MHz

16 Datasheet

To ensure the system is ready for current and future Pentium II processors, the range of values in

bold in Table 1 must be supported. A smaller range will risk the ability of the system to migrate to

a higher performance Pentium II processor and/or maintain compatibility with current Pentium II

processors.

NOTES:

1. 0 = Processor pin connected to V

2. 1 = Open on processor; may be pulled up to TTL V

on motherboard.

3. VRM output should be disabled for V

CORE

values less than 1.80 V.

4. To ensure the system is ready for the Pentium

II processors, the values in

BOLD

in Table 1 must be supported.

Note that the ‘11111’ (all opens) ID can be used to detect the absence of a processor core in a given

slot 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

voltage regulator is stable. This will prevent the possibility of the processor supply going above the

specified V

CORE

in the event of a failure in the supply for the VID lines. In the case of a DC-to-DC

converter, this can be accomplished by using the input voltage to the converter for the VID line

Table 1. Voltage Identification Definition

1, 2, 3

Processor Pins

VID4 VID3 VID2 VID1 VID0 V

CORE

01111 - 00110 Reserved

00101

1.80

00100

1.85

00011

1.90

00010

1.95

00001

2.00

00000

2.05

11111 No Core

11110

2.1

11101

2.2

11100

2.3

11011

2.4

11010

2.5

11001

2.6

11000

2.7

10111

2.8

10110 2.9

10101 3.0

10100 3.1

10011 3.2

10010 3.3

10001 3.4

10000 3.5

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 83 84

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Intel SL2YM Datasheet Page 16

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