VSC7440 datasheet(216/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

199

Figure 45 •

Sticky Events Available as Global Events

The global events [3:0] are typically allocated for detected control frames, frames dropped due to wrong

configuration, frames dropped due to VLAN filtering, and so on.

As an example, a particular event that is normally only of interest during debug, ANA_L2:

STICKY.VLAN_IGNORE_STICKY can be configured to be the global event 0 in

ANA_L2:STICKY_MASK.VLAN_IGNORE_STICKY_MASK(0).

The following illustration shows the configuration and status available for each port statistics counter.

Figure 46 •

Port Statistics Counters

Before the statistic counters can be used, they must be initialized to clear all counter values and sticky

bits (ANA_AC:STAT_GLOBAL_CFG_PORT:STAT_RESET.RESET).

For each counter the type of frames that are counted must be configured

(ANA_AC:STAT_CNT_CFG_PORT.STAT_CFG.CFG_CNT_FRM_TYPE).

Note: Frames without any destination are seen by the port statistics block as aborted.

Each counter must be configured whether frames or bytes are counted.

(ANA_AC:STAT_CNT_CFG_PORT.STAT_CFG.CFG_CNT_BYTE).

It is possible to limit counting to certain priorities

(ANA_AC:STAT_CNT_CFG_PORT.STAT_CFG.CFG_PRIO_MASK).

Counter events that can trigger counting can be selected among the global events

(ANA_AC:STAT_GLOBAL_CFG_PORT. STAT_GLOBAL_EVENT_MASK). There is one common event

mask for each of the four counter sets.

Each 40-bit counter consists of an MSB part and an LSB part (ANA_AC:STAT_CNT_CFG_PORT.

STAT_MSB_CNT and ANA_AC:STAT_CNT_CFG_PORT.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

ANA_CL

ANA_L2

ANA_L3

ANA_AC

global events[7:0]

Port

Policer

*_sticky

*_sticky_mask(3)

*_sticky_mask(2)

*_sticky_mask(1)

*_sticky_mask(0)

*_sticky

*_sticky_mask(3)

*_sticky_mask(2)

*_sticky_mask(1)

*_sticky_mask(0)

*_sticky_mask(3)

*_sticky_mask(2)

*_sticky_mask(1)

*_sticky_mask(0)

*_sticky_mask(3)

*_sticky_mask(2)

*_sticky_mask(1)

*_sticky_mask(0)

Port_num

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