Intel 273246-002 Processor Assembly, Post Code Debugger, Thermal Management, ITP Debugger Port

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.

4.1Processor Assembly

The processor assembly contains the Celeron™ 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.

4.1.1Thermal 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 Celeron 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.

4.1.2ITP Debugger Port

The evaluation platform is populated with a 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 Celeron processor’s registers and signals without affecting high speed operation. This allows the system to operate at full speed with the debugger attached.

4.2Post Code Debugger

The evaluation board has an on-board Post Code Debugger. Data from any code that does an I/O write to 80H is latched on the two led displays (U12/U13). During BIOS startup, code is posted to these LEDs to indicate what the BIOS is doing. Application code can post its own data to these LEDs by doing an I/O write to address 80H. The 22V10 PLD code used to implement this function is included in Appendix A, “PLD Code Listing.”

Celeron™ Processor Development Kit Manual 4-1