
PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
53
5. 5. IRT-to-Switch Fabric Interface
An IRT interface consists of
a
and
b
in Figure 33 on page 51. Where
a
refers to each of the four SE_SOC_OUT and
SE_D_OUT(3:0) data ports, and
b
refers to the corresponding BP_ACK_IN signals in the QRT.
The failure conditions detected by the IRT on
b
, and the actions taken are summarized in Table 9.
5. 6. QSE Interface, Receive Data Direction
A QSE Receive interface consists of
c
and
d
in Figure 33 on page 51. Where
c
refers to each of the four SE_SOC_IN
and SE_D_IN(3:0) data ports, and
d
refers to the corresponding BP_ACK_OUT signals in the QSE.
Table 9. Failure Conditions, IRT-to Switch Fabric Interface
Fault Detected on b
Action Taken
Comment
Cannot lock to special coding and
guaranteed transitions on
BP_ACK_IN.
Idle cells sent out on data interface
a
.
Internally to the IRT, cells that would
have gone out are MNACKed, and no
multicast cells are generated for the port.
BP_ACK_FAIL signaled to the
microprocessor.
Port treated as dead. Problem is most
likely with the BP_ACK_IN line.
No BP received on BP_ACK_IN
line.
Idle cells sent out on data interface
a
.
Internally to the IRT, cells that would
have gone out are MNACKed, and no
multicast cells are generated for the port.
BP_REMOTE_FAIL signaled to the
microprocessor.
Port treated as dead. Problem is with
the forward data flow, and the QSE is
signaling this back to the IRT.
No ACK, MNACK, or ONACK
received, although unicast cell
sent out.
Cell transmitted treated as sent.
ACK_LIVE_FAIL signaled to the
microprocessor.