Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
3.2.4.3 QSE Interface, Transmit Data Direction
In Figure 48 on page 44, a QSE transmit interface consists of e and f. In the figure, e refers to each
of the 32 SE_SOC_OUT and SE_D_OUT#(3:0) data ports, while f refers to the corresponding
BP_ACK_IN signals in the QSE. Table 4 summarizes the failure conditions detected by the QSE
on f and the actions taken.
Table 4. Failure Conditions, QSE Transmit Interface
Fault Detected On f
Action Taken
Comment
Cannot lock to special coding and
guaranteed transitions on
BP_ACK_IN.
Idle cells sent out on data interface e. If possible, Port treated as dead. Problem is
data routed around port. Multicast data is
dropped if all possible port choices are dead or
off. Unicast data is optionally dropped if all pos-
sible port choices are dead or off.
probably with the BP_ACK_IN
line.
BP_ACK_FAIL (refer to “BP_ACK_FAIL” on
page 112) signaled to the microprocessor.
No backpressure received on
BP_ACK_IN.
Idle cells sent out on data interface e. If possible, Port treated as dead. Problem is
data routed around port. Multicast data is
dropped if all possible port choices are dead or
off. Unicast data is optionally dropped if all pos-
sible port choices are dead or off.
with the forward data flow.
BP_REMOTE_FAIL (refer to
“BP_REMOTE_FAIL” on page 112) signaled to
the microprocessor.
No ACK, MNACK, or ONACK
received, although the cell sent out is
not currently monitored in the QSE.
No action taken.
Lack of ACK, MNACK, or
ONACK is not monitored by the
QSE.
3.2.4.4 Switch Fabric-to-ORT Interface
In Figure 48 on page 44, an ORT interface consists of g and h. In the figure, g refers to each of the
four SE_SOC_IN and SE_D_IN#(3:0) data ports, while h refers to the corresponding
BP_ACK_OUT signals in the QRT. Table 5 summarizes the failure conditions detected by the
ORT on g and the actions taken.
Table 5. Failure Conditions, Switch Fabric-to-ORT Interface
Fault Detected On g
Action Taken
Comment
Cannot lock to special coding and
guaranteed transitions on
SE_SOC_IN.
No backpressure sent out on h. All data dis- Withholding backpressure on h signals to
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 h. All data dis- Probably due to unconnected input lines
carded. SE_INPUT_PORT_FAIL signaled
to the microprocessor.
that are pulled up or down. Withholding
backpressure on h 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 h. All data dis- Withholding backpressure on h signals to
carded. SE_INPUT_PORT_FAIL signaled
to the microprocessor.
the previous stage that the port should not
be used.
52
PMC [ PMC-SIERRA, INC ]
