PM9313 datasheet(45/343 Pages) PMC

45 / 343 page

PM9311/2/3/5 ETT1™ CHIP SET

PMC-2000164

ISSUE 3

ENHANCED TT1™ SWITCH FABRIC

Released

Data Sheet

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

PMC-Sierra, Inc.

Figure 15. (Continued)

The departure of a cell from the VOQ will mean that there is now space for at least one more cell in that

VOQ, and that could trigger the LCS Grant Manager to issue a new grant, assuming that a new request

had come in for that queue.

1.3.3.2

The Output Process

Each EPP consists of an input (i)EPP and an output (o)EPP. The request counters and virtual output

queues described above all reside in the iEPP. The oEPP has virtual input queues that receive the cells

forwarded via the Crossbar.

OC-48c a

EPP

0.0

0,1

0,2

0,3

OC-48c

linecard

Virtual Output Queues

Crossbar

Scheduler

Request (0)

Linecard a receives the grant and forwards cell body to go to output (0,1).

A request is made to the Scheduler.

OC-48c a

EPP

0,0

0,1

0,2

0,3

OC-48c

linecard

Virtual Output Queues

Crossbar

Scheduler

Grant (0

The Scheduler issues a grant to queue (0,1).

The EPP then sends the cell through the crossbar to the output queue of port 0

0,0

0,1

0,2

0.3

0,0

0,1

0,2

0.3

PM9313 Datasheet(PDF) 45 Page - PMC-Sierra, Inc

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