PM73487 datasheet(63/251 Pages) PMC

63 / 251 page

PM73487 QRT

PMC-Sierra, Inc.

PMC-980618

Issue 3

622 Mbps ATM Traffic Management Device

Released

Datasheet

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

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.

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