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

Debug Tools Specifications
Datasheet 95
9.0 Debug Tools Specifications
Please refer to the ITP700 Debug Port Design Guide, and the appropriate Platform
Design Guide for information regarding debug tools specifications.
9.1 Logic Analyzer Interface (LAI)
Intel is working with two logic analyzer vendors to provide logic analyzer interfaces (LAIs)
for use in debugging Pentium 4 processor in the 478-pin package systems. Tektronix* and
Agilent* should be contacted to get specific information about their logic analyzer
interfaces. The following information is general in nature. Specific information must be
obtained from the logic analyzer vendor.
Due to the complexity of Pentium 4 processor in the 478-pin package systems, the LAI is
critical in providing the ability to probe and capture system bus signals. There are two sets
of considerations to keep in mind when designing a Pentium 4 processor in the 478-pin
package system that can make use of an LAI: mechanical and electrical.
9.1.1 Mechanical Considerations
The LAI is installed between the processor socket and the Pentium 4 processor in the
478-pin package. The LAI pins plug into the socket, while the Pentium 4 processor in the
478-pin package pins plug into a socket on the LAI. Cabling that is part of the LAI
egresses the system to allow an electrical connection between the Pentium 4 processor in
the 478-pin package and a logic analyzer. The maximum volume occupied by the LAI,
known as the keepout volume, as well as the cable egress restrictions, should be obtained
from the logic analyzer vendor. System designers must make sure that the keepout
volume remains unobstructed inside the system. Note that it is possible that the keepout
volume reserved for the LAI may differ from the space normally occupied by the Pentium 4
processor in the 478-pin package heatsink. If this is the case, the logic analyzer vendor
will provide a cooling solution as part of the LAI.
9.1.2 Electrical Considerations
The LAI will also affect the electrical performance of the system bus; therefore, it is critical
to obtain electrical load models from each of the logic analyzers to be able to run system
level simulations to prove that their tool will work in the system. Contact the logic analyzer
vendor for electrical specifications and load models for the LAI solution they provide.