Pentium ® M/Celeron ® M Processor Logic Analyzer Support (Fsb Lai); Background/Justification; Implementation; Intel ® Pentium ® M/Celeron ® M Processor On-Die Logic - Intel 855GME Design Manual

®
Intel 855GME Chipset and Intel
4.2.2 Pentium
(FSB LAI)
4.2.2.1

Background/Justification

The second key tool (other than the ITP) that is needed to debug BIOS, logic, signal integrity,
general software, and general hardware issues involving CPUs, chipsets, SIOs, PCI devices, and
other hardware in platform design is the Intel Pentium M/Celeron M processor FSB Logic
Analyzer probe. This critical tool is widely used by various validation, test, and debug groups
within Intel as well as by third party BIOS vendors, OEMs, and other developers. For the Intel
Pentium M/Celeron M processor, Agilent* Corporation has developed this tool and provides the
only visibility to this critical system bus.
Note: It is extremely important that any Intel Pentium M/Celeron M processor/Intel 855GME
chipset-based systems designed without Intel Pentium M/Celeron M processor FSB LAI
support may severely limit the ability of various Intel validation, test, and debug groups from
debugging various issues in a reasonable amount of time. For this reason, it is very critical
that Pentium
There are two primary pieces to providing this support:
1. Providing a motherboard with a CPU socket. The Intel Pentium M/Celeron M processor FSB
LAI is an interposer that plugs into the CPU socket, and the CPU then plugs into the logic
analyzer. The use of non-standard sockets may also prohibit the logic analyzer from working
as the locking mechanism may become inaccessible. It is important to check the logic analyzer
design guidelines to ensure a particular socket will work. The logic analyzer was designed to
accommodate the most common (and at the time, the only known) Intel Pentium M/Celeron M
processor sockets on the market.
2. Observing Intel Pentium M/Celeron M processor FSB LAI keepout requirements. There are
several options to achieve this. For example, removing the motherboard from the case
(typically the first step to meeting keepout requirements) or relocating any components that
would otherwise be in the keepout area for debug purposes (i.e., axial lead devices that can be
de-soldered and re-soldered to the other side of the board, parts that can be removed and
blue-wired further away, etc.). When keepouts still cannot be met, Intel strongly recommends
that a separate debug motherboard be built that has the same bill of materials (BOM) and
Netlist, but with Intel Pentium M/Celeron M processor FSB LAI keepout requirements met
(this also gives the opportunity to add other test-points).
4.2.2.2

Implementation

Details from Agilent Corporation on the Intel Pentium M/Celeron M processor FSB LAI
mechanicals (i.e., design guide with keepout volume information) are available for ordering.
Contact your local Intel field representative to obtain the latest design information. Refer to
Section 4.3.3
®
4.2.3 Intel

Analyzer Trigger (ODLAT) Support

The Intel Pentium M/Celeron M processor provides support for three address/data recognizers
on-die for setting on-die logic analyzer triggers (ODLAT) or breakpoints. Details from American
Arium* on the ODLAT are currently available for ordering.
76
®
6300ESB ICH Embedded Platform Design Guide
® ®
M/Celeron
® ®
M/Celeron M Processor FSB LAI support is provided.
for more details.
®
Pentium M/Celeron
M Processor Logic Analyzer Support
®
M Processor On-Die Logic