641 datasheet(85/106 Pages) INTEL

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Features

6.1

Power-On Configuration Options

Several configuration options can be configured by hardware. The Pentium 4 processor

samples the hardware configuration at reset, on the active-to-inactive transition of

RESET#. For specifications on these options, refer to Table 34.

The sampled information configures the processor for subsequent operation. These

configuration options cannot be changed except by another reset. All resets reconfigure

the processor; for reset purposes, the processor does not distinguish between a

"warm" reset and a "power-on" reset.

6.2

Clock Control and Low Power States

The processor allows the use of AutoHALT and Stop-Grant states to reduce power

consumption by stopping the clock to internal sections of the processor, depending on

each particular state. See Figure 16 for a visual representation of the processor low

power states.

Table 34.

Power-On Configuration Option Signals

Configuration Option

Signal1,2

NOTES:

1. Asserting this signal during RESET# will select the corresponding option.

2. Address signals not identified in this table as configuration options should not be asserted

during RESET#.

Output tristate

SMI#

Execute BIST

INIT#

In Order Queue pipelining (set IOQ depth

to 1)

A7#

Disable MCERR# observation

A9#

Disable BINIT# observation

A10#

APIC Cluster ID (0-3)

A[12:11]#

Disable bus parking

A15#

Disable Hyper-Threading Technology

A31#

Symmetric agent arbitration ID

BR0#

RESERVED

A[6:3]#, A8#, A[14:13]#,

A[16:35]#

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