VSC7440 datasheet(238/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

221

Figure 62 •

Queue Mapping Tables

Mapping is accomplished by the following steps.

Find queuing class (qc_cl)

qc_sel = QMAP_QOS_TBL (qgrp,dport)

qc = (qos, cosid, pcp, tc) (qos_sel)

Find queue. This mapping depends on which of the following hierarchy modes are configured:

Mode 0: Normal mode. This is the default mode on all ports. It is used for arbitrating all frames with

the same queuing class, treating all source ports equally. SE = QMAP_SE_TBL (128 + qc, dport),

inp = source port.

Mode 1: Group mode. This mode is used for having eight queues per queue group in layer 0. Used

in Carrier applications where each service should have its own queues, with a traffic profile per

queuing class.

SE = QMAP_SE_TBL (qgrp,dstp), inp = qc.

The following illustration shows the group scheduling mode.

Input number

SE number

Map Mode

src port

QoS Table

(qgrp, dport)

qgrp

qc_sel

QoS

PCP

COSID

SE Table

Ingress

Service Stat

frm

val 0-7

address

oct

cos_sel

cos8_ena

base_addr

oam_cnt_sel

drop_stat_ctrl

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