PM73487 datasheet(65/251 Pages) PMC

65 / 251 page

PM73487 QRT

PMC-Sierra, Inc.

PMC-980618

Issue 3

622 Mbps ATM Traffic Management Device

Released

Datasheet

3.2.4.5

Types of Failures and Their Manifestations

Table 6 shows possible faults, their effects, and how they affect the network.

Parity fail.

ACK sent out on h. Parity errored cell

dropped. TX_PARITY_FAIL (refer to

“TX_PARITY_FAIL” on page 111) sig-

naled to the microprocessor.

ACK already sent by the time the QRT

has detected a parity error. In this case, a

cell that was dropped was ACKed.

Table 6. Faults and Effects on the Network

Fault

Manifestation

Effect on Network

Wire

Connection

Data line from SE_D_IN#(3:0) stuck at

0 or 1.

Invalid idle cell, cells with

missing Cell Present and

parity error.

Port shut down ( interrupt gener-

ated and backpressure withheld)

on receipt of first 2 consecutive

bad idle cells until condition is

fixed, as port failure is sent to the

source of data by lack of backpres-

sure indication. If only one bad

idel cell received, due to the

round-trip delay between the QRT

and the QSE, the source could

send another (user) cell, causing

the destination (QRT) to come out

of the shut down state. This means

the raw interrupt at QRT

(SE_INPUT_PORT_FAIL) will

be asserted and deasserted. The

lateched interrupt

(SE_INPUT_PORT_FAIL_LATC

H) will still be asserted.

SE_SOC_IN(3:0) line stuck at 0 or 1.

Loss-of-lock on special cod-

ing on SE_SOC_IN(3:0).

Port shut down until condition is

fixed, as port failure is sent to the

source of data by lack of backpres-

sure indication.

BP_ACK_IN(3:0) line stuck at 0 or 1.

Loss-of-lock on special cod-

ing on BP_ACK_IN(3:0).

Port shut down until condition is

fixed.

Bridging fault within a port.

Invalid idle cell with some

10/01 fail or parity error.

Port shut down on receipt of first

bad idle cell until condition is

fixed, as port failure is sent to the

source of data by lack of backpres-

sure indication.

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

Fault Detected On

Action Taken

Comment

PM73487 Datasheet(PDF) 65 Page - PMC-Sierra, Inc

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