Mobile Intel Pentium 4 Processor with 533 MHz Front Side Bus

Mobile Intel
®
Pentium
®
4 Processor with 533 MHz System Bus Datasheet 71
Configuration and Low Power Features
6 Configuration and Low Power
Features
6.1 Power-On Configuration Options
Several configuration options can be configured by hardware. The mobile Intel Pentium 4
processor samples its hardware configuration at reset, on the active-to-inactive transition of
RESET#. For specifications on these options, please refer to Table 27.
Frequency determination functionality will exist on engineering sample processors which means
that samples can run at varied frequencies. Production material will have the bus to core ratio
locked during manufacturing and can only be operated at the rated frequency.
The sampled information configures the processor for subsequent operation. These configuration
options cannot be changed except by another reset. All resets reconfigure the processor.
NOTE: Asserting this signal during RESET# will select the corresponding option.
6.2 Clock Control and Low Power States
The use of AutoHALT, Stop-Grant, Sleep, Deep Sleep and Deeper Sleep states is allowed in mobile
Intel Pentium 4 processor based systems 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.
6.2.1 Normal State
This is the normal operating state for the processor.
Table 27. 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#