Kontron AT8404 - Manual (Page 95)

Software Description
82 AT8404 User Guide
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4.3.2.17 GetClockState
See PICMG AMC.0 R2.0 table 3-45.
4.3.3 Field Replaceable Unit (FRU) Information
This FRU information contains the IPMI defined Board and Product Information areas that hold the part
number and serial number of the board and the Multirecord Information Area that contains the PICMG
defined Point to Point Information records.
The Internal Use Area is pre-allocated to 384 bytes and is free for customer use.
This FRU information responds to FRU ID #0, which is the ID for the IPMC.
4.3.4 E-Keying
E-Keying has been defined in the PICMG 3.0 Specification to prevent board damage, prevent wrong opera-
tion, and verify fabric compatibility. The FRU data contains the board point-to-point connectivity record as
described in Section 3.7.2.3 of the PICMG 3.0 specification.
When the board enters M3 power state, the shelf manager reads in the board point-to-point connectivity
record from FRU and determines whether the board can enable the Gigabit Ethernet ports to the back plane.
Set/Get Port State IPMI commands defined by the PICMG 3.0 specification are used for either granting or
rejecting the E-keys.
Additional E-Keying is provided for connectivity between the AMC carrier and the AMC bays as described the
in Section 3.9 of the AMC.0 R.2.0 specification. The Set/Get AMC Port State IPMI commands defined by the
AMC.0 specification are used for either granting or rejecting the E-keys.
4.3.4.1 Clock e-keying
On the AT8404 the synchronous clock distribution can be monitored and controlled.
The synchronous clock circuit includes
• a Zarlink ZL30108 PLL that can be fed from a primary and secondary clock source coming from the ATCA
backplane
• a FPGA that controls the clock distribution from and to the AMC bays
• MVLDS buffers to disable all clock outputs to backplane or AMC bays
The AT8404 implements the clock ekeying mechanism defined in the AMC.0 Rev 2 specification to prevent
damage to the AT8404 and the AMC if an incompatible AMC is inserted.
The AT8404 also implements IPMI OEM commands as well as adequate CLI commands to control and monitor
the on-board PLL as well as the MVLDS buffers to the ATCA backplane.
For additional information about clock e-keying please refer to the appropriate Application Note.
Command Name NetFn LUN Command Number
Set ClockState PICMG OEM 0 CmdId: 0x2D