MPC8280 datasheet(1203/1386 Pages) FREESCALE

1203 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-57

34.5.3.11 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

34.5.3.12 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]

34.5.3.13 SNMP MIBs

Control interface and statistics information should be provided per the SNMP MIB definition for IMA.

34.5.4

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.

34.5.4.1

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].

34.5.4.2

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

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