VSC7511 datasheet(64/324 Pages) MICROSEMI

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Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

Figure 18 •

Counter Layout (SYS:STAT:CNT) Per View

Read Example To read the number of good unicast frames transmitted on port 3 (counter c_tx_uc), set

the current view in STAT_CFG.STAT_VIEW to 3 and read SYS:STAT:CNT[0x41]. Note that with the

current view, one could also read Rx and drop counters on port 3

The counters can be cleared per counter group per view. Writing to register

STAT_CFG.STAT_CLEAR_SHOT clears all counters associated with the counter groups specified by

STAT_CFG.STAT_CLEAR_SHOT for the view specified in STAT_CFG.STAT_VIEW.

It is possible to select whether to count frames or bytes for the following specific counters.

•

The Rx priority counters (c_rx_red_prio_*, c_rx_yellow_prio_*, c_rx_green_prio_*, where x is 0

through 7).

•

The Tx priority counters (c_tx_yellow_prio_*, c_tx_green_prio_*, where x is 0 through 7).

•

The Drop priority counters (c_dr_yellow_prio_*, c_dr_green_prio_*, where x is 0 through 7).

The Rx priority counters are programmed through ANA::AGENCTRL, and the Tx and drop priority

counters are programmed through QSYS::STAT_CNT_CFG. When counting bytes, the frame length

excluding inter frame gap and preamble is counted.

For testing purposes, all counters are both readable and writable. All counters wrap around to 0 when

reaching the maximum.

For more information about how the counters map to relevant MIBs, see Port Counters, page 222.

3.7

Basic Classifier

The switch core includes a common basic classifier, which determines a number of properties affecting

the forwarding of each frame through the switch. These properties are:

•

Frame acceptance filtering. Drop illegal frame types.

•

QoS classification. Assign one of eight QoS classes to the frame.

•

Drop precedence (DP) classification. Assign one of two drop precedence levels to the frame.

•

DSCP classification. Assign one of 64 DSCP values to the frame.

•

VLAN classification. Extract tag information from the frame or use the port VLAN.

•

Link aggregation code generation. Generate the link aggregation code.

•

CPU forwarding determination. Determine CPU Forwarding and CPU extraction queue number

The outcome of the classifier is the basic classification result, which can be overruled by more intelligent

frame processing in the VCAP IS1. For more information, see VCAP, page 60.

3.7.1

General Data Extraction Setup

This section provides information about the overall settings for data extraction that provides the data

input to the classifier, VCAP, analyzer, and rewriter.

Rx,

Port=STAT_CFG.STAT_VIEW

Bit 31

Bit 0

0x000

0x02A

c_rx_oct

c_rx_green_prio_7

TX,

Port=STAT_CFG.STAT_VIEW

0x040

0x05E

c_tx_oct

c_tx_aged

Drop,

Port=STAT_CFG.STAT_VIEW

0x080

0x091

c_dr_local

c_dr_green_prio_7

Unused

Counter Groups

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