PM73487 datasheet(64/251 Pages) PMC

64 / 251 page

PM73487 QRT

PMC-Sierra, Inc.

PMC-980618

Issue 3

622 Mbps ATM Traffic Management Device

Released

Datasheet

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.

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 4. Failure Conditions, QSE Transmit Interface

Fault Detected On

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,

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.

BP_ACK_FAIL (refer to “BP_ACK_FAIL” on

page 112) signaled to the microprocessor.

Port treated as dead. Problem is

probably with the BP_ACK_IN

line.

No backpressure received on

BP_ACK_IN.

Idle cells sent out on data interface e. If possible,

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.

BP_REMOTE_FAIL (refer to

“BP_REMOTE_FAIL” on page 112) signaled to

the microprocessor.

Port treated as dead. Problem is

with the forward data flow.

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.

Table 5. Failure Conditions, Switch Fabric-to-ORT Interface

Fault Detected On

Action Taken

Comment

Cannot lock to special coding and

guaranteed transitions on

SE_SOC_IN.

No backpressure sent out on h. All data dis-

carded. SE_INPUT_PORT_FAIL (refer to

“SE_INPUT_PORT_FAIL” on page 112)

signaled to the microprocessor.

Withholding backpressure on h 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 h. 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 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-

carded. SE_INPUT_PORT_FAIL signaled

to the microprocessor.

Withholding backpressure on h signals to

the previous stage that the port should not

be used.

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