
PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
55
The failure conditions detected by the QSE on
f
, and the actions taken are summarized in Table 11.
5. 8. Switch Fabric-to-ORT Interface
An ORT interface consists of
g
and
h
in Figure 33 on page 51. Where
g
refers to each of the four SE_SOC_IN and
SE_D_IN(3:0) data ports, and
h
refers to the corresponding BP_ACK_OUT signals in the QRT.
Table 11. 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
.
Data routed around port if possible.
Multicast data is dropped if all possible port
choices are dead or off.
Unicast data is optionally dropped if all possible
port choices are dead or off.
BP_ACK_FAIL signaled to the microprocessor.
Port treated as dead. Problem
is most likely with the
BP_ACK line.
No BP received on BP_ACK_IN
line.
Idle cells sent out on data interface
e
.
Data routed around port if possible.
Multicast data is dropped if all possible port
choices are dead or off.
Unicast data is optionally dropped if all possible
port choices are dead or off.
BP_REMOTE_FAIL signaled to the
microprocessor.
Port treated as dead. Problem
is with the forward data flow.
No ACK, MNACK, or ONACK
received on BP_ACK_IN line.
No action taken.
This contingency is not
monitored in the QSE.