VSC7440 datasheet(193/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

176

Configure the entry MAC address: LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_MAC_MSB <16

MS MAC bits > LRN::MAC_ACCESS_CFG_1.MAC_ENTRY_MAC_LSB < 32 LS MAC bit >

Configure the VLAN FID:

LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_FID <fid value>

Configure the UPSID/UPSPN value:

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR_TYPE 0 (=UPSID)

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR <UPSPN/port value >

Make the entry valid: LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_VLD 1

Perform access:

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_CMD 0 (=LEARN)

LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT 1

Verify that access succeeded: LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT ==

0? LRN::EVENT_STICKY.CPU_LRN_INSERT_STICKY==1?

3.22.3.2 Adding Multicast Entry with Destination Set in PGID Table

Use the following steps to add Layer 2 multicast entries to the MAC table using the CPU interface.

Configure the entry MAC address: LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_MAC_MSB <16

MSB MAC bits > LRN::MAC_ACCESS_CFG_1.MAC_ENTRY_MAC_LSB < 32 LSB MAC bits >

Configure the VLAN ID:

LRN::MAC_ACCESS_CFG_0.MAC_ENTRY_FID <vid value>

Configure the PGID pointer:

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR_TYPE 3 (=MC_IDX)

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_ADDR <pgid value >

Lock the entry (not subject to aging and automatic removal):

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_LOCKED 1

Make the entry valid:

LRN::MAC_ACCESS_CFG_2.MAC_ENTRY_VLD 1

Perform access:

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_CMD 0 (=LEARN)

LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT 1

Verify that access succeeded: LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT ==

0? LRN::EVENT_STICKY.CPU_LRN_INSERT_STICKY==1?

3.22.4

SCAN Command

The SCAN command easily performs table management, such as port flushing, CPU-based aging, and

port moves.

Scan can be configured with a variety of filters and modifiers that allows the CPU to easily identify and

optionally modify entries matching the configured filter conditions.

The scan operates by running through all entries and whenever entries are found with matching

conditions, the scan either stops with a status of the matching location (for example, a “find next”

operation) or performs the configured modification actions for all entries (for example, “scan all”

operation).

When the scan runs as “find next”, the scan commands are performed for finding the next matching

entry. In this case it is possible to specify a starting row for a scan (

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_ROW and

LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_DIRECT_TYPE).

Whenever the scan stops with a matching entry, the CPU can process the entry and then sets the

starting row to the row following the matching row and, issue another scan command. This can then be

repeated until all entries have been scanned.

SCAN is started by setting LRN::COMMON_ACCESS_CTRL.CPU_ACCESS_CMD 5 (=SCAN) and

setting the shot bit LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT

SCAN is completed when the shot bit is cleared in

LRN::COMMON_ACCESS_CTRL.MAC_TABLE_ACCESS_SHOT.

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