VSC7440 datasheet(192/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

175

3.22.3.1 Adding a Unicast Entry

Use the following steps to add a unicast entry to the MAC table using the CPU interface.

Write direct

Write entry in MAC table

indexed by (row, column)

Configure the index of the entry to write in

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_R

OW,

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_C

OL and

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_T

YPE

Configure entry fields in LRN::MAC_ACCESS_CFG_0,

LRN::MAC_ACCESS_CFG_1 and

LRN::MAC_ACCESS_CFG_2

Status of write operation returned in

LRN::EVENT_STICKY.CPU_WRITE_DIRECT_STICKY

Scan

Find next/Find all

Searches through the MAC

table and either stops at the

first row with entries matching

the specified filter conditions

or perform the specified

actions on all entries matching

the specified filter conditions.

Configure the starting row for the scan in:

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_R

OW,

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_C

OL and

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_T

YPE

Configure an ending row for the scan (if searching through the

complete table is not required):

LRN::SCAN_LAST_ROW_CFG.SCAN_LAST_ROW

For information about search filters and corresponding actions,

see SCAN Command, page 176.

Find smallest

Get the smallest entry in the

MAC table numerically larger

than the specified (FID, MAC).

FID and MAC are evaluated as

a 61 bit number with the FID

being most significant.

Configure MAC and FID of the starting point for the search in

LRN::MAC_ACCESS_CFG_0 and

LRN::MAC_ACCESS_CFG_1.

Configure search filters to be used during find smallest:

Use

LRN::SCAN_NEXT_CFG.SCAN_NEXT_IGNORE_LOCKED_E

NA to only search among entries with

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_LOCKED cleared.

Use LRN::SCAN_NEXT_CFG.FID_FILTER_ENA to only search

among entries with the VID/FID specified in

LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_FID.

Use LRN::SCAN_NEXT_CFG.ADDR_FILTER_ENA to only

search among entries with the address specified in

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR and

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR_TYPE

Clear all

Initialize the table

Clears the entire table.

Table 110 •

MAC Table Access Commands (continued)

Command

Purpose

Use

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