Electrical Specifications

18 Datasheet

2.4 Market Segment Identification (MSID)

The MSID[1:0] signals may be used as outputs to determine the Market Segment of

the processor. Table 3 provides details regarding the state of MSID[1:0]. A circuit can

be used to prevent 130 W TDP processors from booting on boards optimized for 65 W

TDP.

2.5 Reserved, Unused, and TESTHI Signals

All RESERVED lands must remain unconnected. Connection of these lands to V

, V

, or to any other signal (including each other) can result in component malfunction

or incompatibility with future processors. See Chapter 4 for a land listing of the

processor and the location of all RESERVED lands.

In a system level design, on-die termination has been included by the processor to

allow signals to be terminated within the processor silicon. Most unused GTL+ inputs

should be left as no connects as GTL+ termination is provided on the processor silicon.

However, see Table 8 for details on GTL+ signals that do not include on-die termination.

Unused active high inputs, should be connected through a resistor to ground (V

Unused outputs can be left unconnected, however this may interfere with some TAP

functions, complicate debug probing, and prevent boundary scan testing. A resistor

must be used when tying bidirectional signals to power or ground. When tying any

signal to power or ground, a resistor will also allow for system testability. Resistor

values should be within ± 20% of the impedance of the motherboard trace for front

side bus signals. For unused GTL+ input or I/O signals, use pull-up resistors of the

same value as the on-die termination resistors (R

). For details, see Table 14.

TAP and CMOS signals do not include on-die termination. Inputs and used outputs must

be terminated on the motherboard. Unused outputs may be terminated on the

motherboard or left unconnected. Note that leaving unused outputs unterminated may

interfere with some TAP functions, complicate debug probing, and prevent boundary

scan testing.

All TESTHI[13:0] lands should be individually connected to V

via a pull-up resistor

that matches the nominal trace impedance.

Table 3. Market Segment Selection Truth Table for MSID[1:0]

NOTES:

The MSID[1:0] signals are provided to indicate the Market Segment for the processor

and may be used for future processor compatibility or for keying. Circuitry on the

motherboard may use these signals to identify the processor installed.

2. These signals are not connected to the processor die.

3. A logic 0 is achieved by pulling the signal to ground on the package.

4. A logic 1 is achieved by leaving the signal as a no connect on the package.

MSID1 MSID0 Description

Intel

Core™2 Duo desktop processor E6000 and E4000 series and the

Intel

Core™2 Extreme processor X6800

01Reserved

10Reserved

11Reserved

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 117 118

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