VSC7511 datasheet(113/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

Figure 30 •

Entry Layout in Register using Subwords Example

To invalidate an entry in the TCAM (so a lookup never matches the entry), set the type-group for the entry

to 0. If there are more subwords in the entry, each subword can be individually invalidated by setting its

corresponding type-group value to 0.

The action entry is written to VCAP_ACTION_DAT. Similar to an entry data, an action entry also has a

prefixed type value. The following table lists the parameters for the different action types available in

VCAPs.

An action that is associated with an entry type with several subwords per entry has an equal number of

subwords. For actions with several subwords, the subwords are simply concatenated together.

The following illustration shows the action layout in the VCAP_ACTION_DAT register for an SMAC_SIP

action entry. The SMAC_SIP has four subwords per row.

Figure 31 •

Action Layout in Register Example

The counter value associated to the action is written to VCAP_CNT_DAT. VCAP_CNT_DAT contains a

counter value for each subword in the TCAM entry. For action entries, the counter values for each

subword are simply concatenated together.

3.8.6.2

Copying Entries Between Cache and TCAM/RAM

When an entry and associated action is created in the cache, the data in the cache must be copied to a

given address in the TCAM and RAM using the VCAP_UPDATE_CTRL register. Use the following

procedure.

Set VCAP_UPDATE_CTRL.UPDATE_CMD to copy from cache to TCAM/RAM.

Set the address for the entry in VCAP_UPDATE_CTRL.UPDATE_ADDR.

Set VCAP_UPDATE_CTRL.UPDATE_SHOT to initiate the copy operation. The bit is cleared by

hardware when the operation is finished.

Table 71 •

Action and Type Field Parameters

VCAP

Action Type

Action

Width

Subwords

Type Value

[width in ()]

IS1

Not used (0)

IS2

BASE_TYPE

0 (1)

IS2

SMAC_SIP

641 (1)

ES0

VID

Not used (0)

188167

355

subword 1

subword 0

idx: 0

VCAP_TG_DAT

VCAP_ENTRY_DAT

128

160

192

idx: 0

idx: 1

idx: 2

idx: 3

idx: 4

idx: 5

224

256

288

320

352

idx: 6

idx: 7

idx: 8

idx: 9

idx: 10

idx: 11

384

192

IS2.SMAC_SIP

idx: 0

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