VSC7440 datasheet(219/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

202

shadow register when the LSB part is read. As a result, the LSB part must always be read first, and the

MSB part must be read immediately after the LSB part. When writing to the counter, the MSB part must

be written first, followed by the LSB part.

3.23.3.3 Broadcast, Unicast, Multicast (BUM) Policer Statistics

The following table lists the applicable BUM policer statistics registers.

The following illustration shows the configuration and status available for each BUM policer.

Figure 48 •

BUM Policer Statistics

Each of the two counters in a counter set can be configured to which frames are counted and if bytes or

frames are counted. This configuration is shared among all counter sets.

The BUM event mask supports counting the following frame types:

•

Broadcast traffic discarded by BUM policer

•

Multicast traffic discarded by BUM policer

•

Unicast traffic discarded by BUM policer

•

Broadcast traffic applicable for BUM policer but not discarded

•

Multicast traffic applicable for BUM policer but not discarded

•

Unicast traffic applicable for BUM policer but not discarded

The event mask is configured in ANA_AC:STAT_GLOBAL_CFG_BUM:STAT_GLOBAL_EVENT_MASK.

Each 40-bit counter consists of an MSB part and an LSB part

(ANA_AC:STAT_CNT_CFG_BUM.STAT_MSB_CNT and ANA_AC:STAT_CNT_CFG_

BUM.STAT_LSB_CNT). The MSB part of the counter is latched to a shadow register when the LSB part

is read. As a result, the LSB part must always be read first, and the MSB part must be read immediately

after the LSB part. When writing to the counter, the MSB part must be written first, followed by the LSB

part.

Table 129 •

BUM Policer Statistics Registers Overview

Target::Register.Field

Description

Replication

ANA_AC:STAT_GLOBAL_CFG_BUM

: STAT_GLOBAL_CFG

Configures counting bytes or frames per BUM policer

index.

ANA_AC:STAT_GLOBAL_CFG_BUM

: STAT_GLOBAL_EVENT_MASK

Configures global event mask per BUM policer index.

ANA_AC:STAT_CNT_CFG_BUM.ST

AT_LSB_CNT

Least significant 32 bits of counters per BUM policer

index.

per BUM policer

index × 2

ANA_AC:STAT_CNT_CFG_BUM.ST

AT_MSB_CNT

Most significant 8 bits of counters per BUM policer index. per BUM policer

index × 2

index =

ANA_L3:VLAN:BUM_CFG.BUM_SLB_IDX

ANA_L2:ISDX:MISC_CFG.BUM_SLB_IDX

Set of six counters per

BUM policer

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