Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

Features
Datasheet 81
7.0 Features
7.1 Power-On Configuration Options
Several configuration options can be configured by hardware. The Pentium 4 processor in
the 478-pin package samples the hardware configuration at reset, on the active-to-
inactive transition of RESET#. For specifications on these options, please refer to Ta b l e
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.
NOTE:
1. Asserting this signal during RESET# will select the corresponding option.
7.2 Clock Control and Low Power States
The use of AutoHALT, Stop-Grant, Sleep, and Deep Sleep states is allowed in Pentium 4
processor in the 478-pin package based systems to reduce power consumption by
stopping the clock to internal sections of the processor, depending on each particular
state. See Figure 31 for a visual representation of the processor low power states.
7.2.1 Normal State—State 1
This is the normal operating state for the processor.
7.2.2 AutoHALT Powerdown State—State 2
AutoHALT is a low power state entered when the processor executes the HALT
instruction. The processor will transition to the Normal state upon the occurrence of SMI#,
BINIT#, INIT#, or LINT[1:0] (NMI, INTR). RESET# will cause the processor to immediately
initialize itself.
Table 34. 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#
Symmetric agent arbitration ID BR0#