VSC7440 datasheet(79/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

3.12.3.2 VCAP IS2

The following table lists the parameters that apply to the VCAP IS2.

The type-group field must be inserted into entries when programming rules, because the VCAP IS2

supports more than one entry size.

Because only one action size is supported by the VCAP IS2, 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 IS2 based on entry and

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

Table 45 •

VCAP IS2 Parameters

Parameter

Description

Number of VCAP addresses

1,024 per block that is allocated to this VCAP

Width of entry

36 bits per address

Width of action

70 bits per address

Counter-type

1-bit saturating counter

Supported entry sizes

X4, X8, X16

Supported action sizes

Associated register target

VCAP_SUPER

Table 46 •

VCAP IS2 Entry Type-Group Fields

Address Offset

Size

Entry

Type-Group

Description

0b1

Software must insert 1 bit with the value 1 into first address of

all X4 entries.

0b10

Software must insert 2 bit with the value 2 into first address of

all X8 entries.

X16

0b100

Software must insert 3 bit with the value 4 into first address of

all X16 entries.

1, 2, 3, 5, 6, 7, 9, 10,

11, 13, 14, and 15

Software must not insert type-group into addresses 1, 2, 3, 5, 6,

7, 9, 10, 11, 13, 14, and 15 for entries.

4 and 12

0b0

Software must insert 1 bit with the value 0 into addresses 4 and

12 of all entries.

0b00

Software must insert 2 bits with the value 0 into address 8.

Table 47 •

VCAP IS2 Entry/Action Bit Distribution

Address Offset

X16

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

e[33:0]

e[32:0]

e[70:35],

a[139:70]

e[69:34]

e[68:33]

e[106:71],

a[209:140]

e[105:70]

e[104:69]

e[142:107],

a[279:210]

e[141:106]

e[140:105]

e[176:142]

e[175:141]

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