Freescale Semiconductor MPC8260 - Manual (Page 1164)

Inverse Multiplexing for ATM (IMA)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
33-62 Freescale Semiconductor
33.5.3.11 Test Pattern Control
• Initiate transmit test patterns in the group’s transmit ICP cells (via TXTC and TXTP), and monitor
response in the receive ICP cells of the associated receive group
• Respond to test patterns by:
— Recognizing test pattern activity in the received ICP cells
— Locating the Tx Test Pattern field in the ICP cell of the test link. (Because the SCCI field
changes as part of the test pattern generation by the far end, the cell will necessarily be among
the received ICP cells. Locate the latest ICP cell with a LID matching the Tx LID of the test
link).
— Signalling back via the transmit ICP cells of the associated transmit group, by modifying the
transmit ICP cell template appropriately
33.5.3.12 Performance Parameter Measurement and Reporting
• Establish timers to correlate errors with time intervals (e.g. to determine severely errorred seconds
(SES) or unusable seconds (UUS))
• Maintain statistics
• Enable/disable receive and transmit event counters according to severely errorred seconds (SES)
condition via ILRCNTL[SES] and ILTCNTL[SES]
33.5.3.13 SNMP MIBs
Control interface and statistics information should be provided per the SNMP MIB definition for IMA.
33.5.4 IMA Software Procedures
The following procedures must be followed in order to assure the synchronization of changes between the
link state machines and the group state machine. Issues to be considered are order of changes to the ICP
cell and pointer, group order structure and pointer, IMA PHY assignment structure, and group/link Tx
control fields.
33.5.4.1 Transmit ICP Cell Signalling
1. Copy the transmit ICP cell template currently in use (as indicated by TICPPTR) to the ICP cell
template area not in use.
2. In the new template, change the ICP cell template fields as appropriate.
3. Verify that the IGTCNTL[ICPC] equals IGTSTATE[ICPCA]. If not, wait until it does.
4. Change TICPPTR to point to the “changed/altered” (see step 1) ICP cell template.
5. Toggle IGTCNTL[ICPC].
33.5.4.2 Receive Link Start-up Procedure
Before “activation” of links and group can take place, ICP cells must be received and processed by the
management software. Software must configure all IMA links to “group unassigned” mode. Reception