Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
3.2.4.2 QSE Interface, Receive Data Direction
In Figure 48 on page 44, a QSE receive interface consists of c and d. In the figure, c refers to each
of the four SE_SOC_IN and SE_D_IN#(3:0) data ports, while d refers to the corresponding
BP_ACK_OUT signals in the QSE.
Table 3 summarizes the failure conditions detected by the ORT on c and the actions taken.
Table 3. Failure Conditions, QSE Receive Interface
Fault Detected On c
Action Taken
Comment
Cannot lock to special coding and No backpressure sent out on d. All data dis- Withholding backpressure on d signals to
guaranteed transitions on
SE_SOC_IN.
carded. SE_INPUT_PORT_FAIL (refer to
“SE_INPUT_PORT_FAIL” on page 112)
signaled to the microprocessor.
the previous stage that the port should not
be used.
Invalid cell present coding on
SE_D_IN#(3:0).
No backpressure sent out on d. All data dis- Probably due to unconnected input lines
carded. SE_INPUT_PORT_FAIL signaled to that are pulled up or down.
the microprocessor.
Withholding backpressure on d signals to
the previous stage that the port should not
be used.
Bad idle cell coding on
SE_D_IN#(3:0).
No backpressure sent out on d. All data dis- Withholding backpressure on d signals to
carded. SE_INPUT_PORT_FAIL signaled to the previous stage that the port should not
the microprocessor.
be used.
Parity fail.
ONACK sent out on d for unicast data. Mul- The QSE does not necessarily have time to
ticast data dropped. PARITY_ERROR (refer drop the cell by the time it has detected a
to the QSE Long Form Data Sheet) signaled parity error.
to the microprocessor.
51
PMC [ PMC-SIERRA, INC ]
