VSC7440 datasheet(81/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

Because only one action size is supported by the VCAP LPM, no type-group is inserted into actions

when programming rules.

It is possible to calculate the distribution of entry and action bits in the VCAP LPM based on entry and

action widths together with the entry type-group field width.

The VCAP LPM does not implement default rules. If the key does not match any entries, or if no

resources (blocks) are assigned to the VCAP LPM, routing lookups are treated as misses.

3.12.3.4 VCAP ES0

VCAP ES0 has 512 addresses available. The following parameters apply to the VCAP ES0.

The type-group field is not used when programming entries and actions, because VCAP ES0 supports

only one entry size and one action size.

1, 3, 5, and 7

0b0

Software must insert 1 bit with the value 0 into

uneven addresses of all entries.

2 and 6

0b00

Software must insert 2 bit with the value 0 into

addresses 2 and 6 of all entries.

0b000

Software must insert 3 bit with the value 0 into

addresses 4 of all entries.

Table 50 •

VCAP LPM Entry/Action Bit Distribution

Address Offset

e[34:0], a[69:0]

e[33:0]

e[32:0]

e[31:0]

e[68:34]

e[67:33]

e[66:32]

e[101:68]

e[100:67]

e[136:102]

e[135:101]

e[168:136]

e[203:169]

e[237:204]

e[272:238]

Table 51 •

VCAP ES0 Parameters

Parameter

Description

Number of VCAP addresses

512.

Width of entry

30 bits per address.

Width of action

285 bits per address.

Counter-type

1-bit saturating counter.

Supported entry sizes

X1.

Supported action sizes

X1.

Associated register target

VCAP_ES0.

Table 49 •

VCAP LPM Entry Type-Group Fields (continued)

Address Offset

Size

Entry Type Group

Description

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