PM9313 datasheet(33/343 Pages) PMC

33 / 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 8. LCS Cell Sliced Across Dataslices and Crossbars

The 64 byte payload cell requires six Dataslices per port and 12 Crossbars (32 port, non-redundant). The

76 byte payload cell requires seven Dataslices per port and 14 Crossbars. The EPP is capable of

supporting the seventh Dataslice.

Because the extra data is obtained by slicing the cell then this does not affect the clock frequency of the

Chip Set. The only effect is that the link between the ETT1 port and the linecard must go up from 18 Gbaud

to 21 Gbaud. This is done by making the link wider, not faster.

1.2.9.2

8, 16, or 32 ports

The ETT1 core can support a maximum of 32 ports. Smaller configurations can be supported by simply not

using some of the ports. However, if the maximum system is an eight or 16 port configuration, then some

Dataslice

Crossbar 0

Slices 0,1

Crossbar 1

Dataslice

Crossbar 2

Slices 2,3

Crossbar 3

Dataslice

Crossbar 10

Slices 10,11

Crossbar 11

Dataslice

Crossbar 12

Slices 12,13

Crossbar 13

LCS Header

(8 Bytes)

Payload

(64 Bytes)

Extra 12 bytes

(6 bytes per slice)

ETT1 Port

Dataslice

Slices 0,1

Dataslice

Slices 2,3

Dataslice

Slices 10,11

Dataslice

Slices 12,13

ETT1 Port

LCS Cell

PM9313 Datasheet(PDF) 33 Page - PMC-Sierra, Inc

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