VSC7440 datasheet(78/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

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

action widths, together with the type-group field-widths.

The VCAP CLM implements default rules. When submitting a key to the VCAP CLM, the analyzer

simultaneously decides which default rule to hit if the key does not match any entries in the VCAP. If no

resources (blocks) are assigned to VCAP CLM, there can be no matches. As a result, default rules will

be hit.

0b100

Software must insert 3 bit with the value 4 into first

address of all X4 actions.

1 and 3

0b0

Software must insert 1 bit with the value 0 into

uneven addresses of all actions.

0b00

Software must insert 2 bit with the value 0 into

address 2 of all actions.

Table 43 •

VCAP CLM Entry/Action Bit Distribution

Address offset

X16

e[34:0], a[68:0] e[33:0], a[67:0] e[32:0],

a[66:0]

e[31:0]

e[30:0]

e[68:34],

a[136:68]

e[67:33],

a[135:67]

e[66:32]

e[65:31]

e[101:68],

a[203:136]

e[100:67]

e[99:66]

e[136:102],

a[272:204]

e[135:101]

e[134:100]

e[168:136]

e[167:135]

e[203:169]

e[202:168]

e[237:204]

e[236:203]

e[272:238]

e[271:237]

e[303:272]

e[338:304]

e[372:339]

e[407:373]

e[440:408]

e[475:441]

e[509:476]

e[544:510]

Table 44 •

VCAP CLM Default Rule Addresses

VCAP

Number of

Default Rules

Address

CLM0

Starting address of CLM0 default rule number n is (6,144 + n × 16).

CLM1

Starting address of CLM1 default rule number n is (6,624 + n × 16).

CLM2

Starting address of CLM2 default rule number n is (7,104 + n × 16).

Table 42 •

VCAP CLM Action Type-Group Fields (continued)

Address Offset

Size

Action Type Group

Description

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