Motorola PowerQUICC II MPC8280 Series Reference Manual page 1282

IMA Software Interface and Requirements
CPM will no longer perform the automatic LASR procedure. Note that when the
interrupt is generated, the ILRSTATE[DL] bit is set, and the software should clear
the IMA group and link receive state information as described above for the GDS
interrupt.
34.5.4.11 Test Pattern Procedure
Test patterns are used verify "connectivity" of a link in a particular group. The NE will
request, via an ICP cell, that a test pattern be looped back to the FE over all links currently
in the group. For this test, the FE will look only at ICP cells received over the link being
tested (LID = x) and upon receiving an ICP cell "echo" the pattern back to the NE over all
the links in the group. The major task of initiating and verifying the pattern on all the links
in the group falls on the software. The MPC8280 will simply transmit and receive the
modified/changed ICP cells. If the software detects that the pattern was "echoed" by the FE,
then connectivity is verified.
34.5.4.11.1 As Initiator (NE)
Alter the (unused) ICP cell template to the "Test Link" command to the FE:
1. Tx Test Control = Set to "Active" and select LID (link) to be tested.
2. Tx Pattern = X (0-255).
3. Increment SCCI.
4. Make this the active ICP template (see Section 34.5.4.1, "Transmit ICP Cell
Signalling").
5. Repeat steps 1-4 until expected pattern is received in any of the incoming ICP cells
(alternate ICP templates must be used).
After sending the request to perform the test (pattern) to the FE, the NE software must wait
for the TX test pattern to be echoed back/received in the RX Pattern field of the ICP cell
(any of the active links in the group can be monitored for the RX Pattern). After verifying
connectivity, the test can be de-activated (set Tx Test Control = "Inactive" and repeat steps
3 and 4 above).
34.5.4.11.2 As Responder (FE)
When the FE receives a request to perform the "pattern" test on any of the active links, it
must monitor the selected link (see Tx LID of Tx Test Control) for reception of an ICP cell.
Upon receiving an ICP cell (remember, the other end is incrementing the SCCI field), the
software should copy the Tx Pattern to the Rx Pattern field of the ICP Cell and transmit the
ICP cell. Alter the ICP cell:
1. Rx Pattern = Tx Pattern (of received ICP Cell).
2. Increment SCCI
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