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AT8402
AMC GbE Channels
Channels 0 and 1 of each AMC are connected to the Ethernet Switch. The Ethernet Switch sup-
ports 1000BASE-BX Gigabit Ethernet.
AMC SAS/SATA
Channels 2 and 3 of the AMC slots are reserved for SAS. All four AMC are connected to the
SAS Expander. Additionally, a direct SATA interconnect between B1 and B3 is configurable, as
well as between B2 and B4 (see section 3.1.3.3).
AMC PCI Express
Bays B1 and B3 implement a x4 PCIe connection on channels 4 to 7. B2 and B4 implement a
x8 connection (channels 4 to 11). All slots are directly connected to the PCI Express switch.
Interconnects to RTM
Each AMC Bay has eight generic interconnects to the RTM Zone 3 (channels 13 to 20).
3.1.7
IPMI
The AT8402 supports an intelligent hardware management system based on the Intelligent
Platform Management Interface (IPMI) Specification 1.5. The hardware management system
provides the ability to manage the power, cooling and interconnect needs of intelligent devices,
to monitor events and to log events to a central repository.
The main building blocks of the IPMI architecture of the AT8402 are:
• IPMC Intelligent Platform Management Controller
• FUM Firmware Update Manager
• CPLD Complex Programmable Logical Device
For further details please refer PICMG 3.0 standard Rev. 2.0.
3.1.7.1
IPMC
The IPM controller is a 16-bit microcontroller for IPMI applications with 512 Kbyte Flash and 40
Kbyte SRAM. It is compliant to IPMI version 1.5 specification. The microcontroller provides I²C
interfaces to have access to the dedicated ShMCs, the AMCs, the RTM and the on board pe-
ripheral devices such as SEEPROM, temperature sensors and others. The microcontroller also
provides three serial interfaces that are connected to the CPLD.
An LPC interface using the KCS protocol for communication between IPMC and PPC is imple-
mented by the CPLD. IPMC operation is supervised by the FUM.
3.1.7.2
FUM
The Firmware Update Manager (FUM) is a microcontroller with 16 Kbyte data flash ROM and
1Kbyte RAM.
Hardware Description
Page 3 - 13
AT8402 User Guide
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