Intel
®
440Bx Scalable Performance Board Development Kit Manual 27
Hardware Reference 4
This section provides reference information on the system design. Included in this section is
connector pinout information, jumper settings, and other system design information.
4.1 Processor Assembly
The processor assembly contains the Pentium
®
III processor, the 82443BX Host Bridge/Controller,
a voltage regulator and an ITP debugger connector. The assembly connects to the baseboard via a
400-pin connector.
Warning: The processor assembly is attached to the baseboard at the factory. Do not remove the processor
assembly from the baseboard. Intel will not support the processor assembly or the baseboard if any
portion of the assembly is removed by the customer.
4.1.1 Thermal Management
The objective of thermal management is to ensure that the temperature of each component is
maintained within specified functional limits. The functional temperature limit is the range within
which the electrical circuits can be expected to meet their specified performance requirements.
Operation outside the functional limit can degrade system performance and cause reliability
problems.
Important: The evaluation kit contains a heatsink and fan attached to the top of the processor. This thermal
solution has been tested in an open air environment at room temperature and is sufficient for
evaluation purposes only. It is up to the designer to provide adequate thermal management for any
designs derived from the schematics provided in your kit.
4.1.2 In-Target Probe Debugger Port
The evaluation platform is populated with a 1.5 V/2.5 V ITP debugger port. The ITP port provides
a path for debugger tools like emulators, in-target probes, and logic analyzers to gain access to the
processor’s registers and signals without affecting high speed operation. This allows the system to
operate at full speed with the debugger attached.
Caution: When using a 300A, 366 or 433 MHz Celeron™ processor, you need to use a 2.5 V ITP plug.
When using a 566 MHz or faster Celeron processor, or a Pentium III processor, you need to use a
1.5 V ITP plug. Using the wrong ITP voltage can damage the processor.
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