Datasheet

Intel
®
Pentium
®
4 Processor on 0.13 Micron Process Datasheet 71
Features
Features 6
6.1 Power-On Configuration Options
Several configuration options can be configured by hardware. The Pentium 4 processor on
0.13 micron process samples hardware configuration at reset, on the active-to-inactive transition of
RESET#. For specifications on these options, refer to Table 6-1.
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.
NOTE:
1. Asserting this signal during RESET# will select the corresponding option.
6.2 Clock Control and Low Power States
The use of AutoHALT, Stop-Grant, and Sleep states is allowed in Pentium 4 processor on
0.13 micron process-based systems to reduce power consumption by stopping the clock to internal
sections of the processor, depending on each particular state. See Figure 6-1 for a visual
representation of the processor low power states.
6.2.1 Normal State—State 1
This is the normal operating state for the processor.
Table 6-1. Power-On Configuration Option Pins
Configuration Option Pin
1
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#