PM9313 datasheet(96/343 Pages) PMC

96 / 343 page

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

PMC-Sierra, Inc.

generated, the Enhanced Port Processor and Dataslice will detect any difference in the information

received from the two, supposedly identical elements and will act as though an error had occurred.

Figure 39. Redundant Connections

In this section, we consider two types of errors that may occur: soft errors and hard errors. Soft errors are

transient errors that do not require replacement of any of the boards. Hard errors are caused by a device

failure resulting in a defective board which should be replaced. On the AIB links a soft error would appear

as a transient CRC error; a hard error would be indicated by the link ready signal going inactive (see

Section 1.10.3 “AIB Links (A)” on page 103).

The significance of this fault model is that all faults associated with redundant elements will appear as a

link error of some form. So the fault detection and recovery procedures for any ETT1 fabric can be

Dataslice

Port

EPP

Dataslice

Port

EPP

Scheduler 0

Crossbar 0

Crossbar 1

Scheduler 1

Fault tolerant region

Flow Control

Crossbar 0

Crossbar 1

PM9313 Datasheet(PDF) 96 Page - PMC-Sierra, Inc