
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATMTraffic Management Device
Released
Datasheet
51
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
guaranteed transitions on
SE_SOC_IN.
No backpressure sent out on
d
. All data dis-
carded. SE_INPUT_PORT_FAIL (refer to
“SE_INPUT_PORT_FAIL” on page 112
)
signaled to the microprocessor.
Withholding backpressure on
d
signals to
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-
carded. SE_INPUT_PORT_FAIL signaled to
the microprocessor.
Probably due to unconnected input lines
that are pulled up or down.
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-
carded. SE_INPUT_PORT_FAIL signaled to
the microprocessor.
Withholding backpressure on
d
signals to
the previous stage that the port should not
be used.
Parity fail.
ONACK sent out on
d
for unicast data.
Mul-
ticast data dropped. PARITY_ERROR (refer
to the
QSE Long Form Data Sheet
) signaled
to the microprocessor.
The QSE does not necessarily have time to
drop the cell by the time it has detected a
parity error.