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As per AMC.1 R1.0, the carrier board (At8001) is required to provide PCI-E 100MHz reference clock
to the AMC on CLK3. However, modules are not required to use it. Kontron recommend using AMC-
Express modules that use the reference clock on CLK3. If the module makes its own reference clock,
then the spread spectrum of the AT8001 clock synthesizer needs to be disabled in the BIOS setup,
otherwise the behavior of the PCI-Express link will be erratic at best.
Note:
All electromagnetic compatibility testing has been done with spread spectrum. Disabling the
spread spectrum can complicate EMC.
Bios Settings:
- Advanced
Advanced
Advanced
Advanced
Advanced
Chipset
2.11 PMC Mezzanine(optional)
The AT8001 supports configuration with a PMC mezzanine. Its characteristics are:
•
3.3V signaling only (not 5V tolerant)
•
64-bit bus, PCI 33MHz, PCI 66MHz or PCI-X 66MHz
Bios Settings:
Advanced
2.12 Redundant BIOS Flash
Two BIOS flash are present on the AT8001. If a BIOS update corrupts a flash and prevent the Xeon
from completing the boot sequence, the IPMC will force a reboot from the other BIOS flash.
Note:
Since the CMOS setup is saved in flash, this will also restore the previous BIOS setup.
2.13 Redundant IPMC Flash & FWUM
The IPMC microcontroller runs a firmware from its internal 512KB flash. It is programmed by an
other microcontroller named FWUM (FirmWare Update Manager). The FWUM keeps the last two
copies of the IPMC firmware in dedicated flash memories. The FWUM act as a watchdog to the IPMC
and can rollback a firmware update in the IPMC in case of problems.
IDE Configuration
On-Board Devices Configuration
On-Board Devices Configuration
ATCA Channel Routing (PICMG).
PCI-Express Configuration
Spread Spectrum Clocking Mode
On-Board Devices Configuration
2-25
On-board AMC B1.
On-board AMC B1.
On-board PMC.
AT8001 User's Guide
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