TC9204-DS-R05 datasheet(18/49 Pages) ETC1

18 / 49 page

TC9204M

Preliminary Data Sheet

determined by EEPROM configuration (default is IP). If no header is found or corresponding

prioritizations are disabled then port based prioritization is executed. When EEPROM is present an

additional method of prioritization is available. This method consists of selecting the highest service class

from all classes corresponding to the enabled prioritization sources (IP, VLAN and port based). For both

methods, when no prioritization source is available the default CoS is used (default is normal priority –

CoS1 but it can be also changed by EEPROM configuration).

The CoS features can be configured by adjusting shared configuration pins and/or programming

EEPROM Register settings. VLAN prioritization can be enabled by EnVLPr shared configuration pin or

by EEPROM register settings, while EnIPPr shared configuration pin or the EEPROM Register settings

can enable IP prioritization. The shared configuration pins are sampled during reset.

The per-port basis CoS can be set using PriClass [x][1:0] shared configuration pins or configuring

EEPROM registers, where x stands for port number. The port-based prioritization can be disabled from

EEPROM settings only.

Configuration

Pins Latched

Description

PriClass[x][1:0] TxDataX_[1:0] Set the priority class per port basis

'00' – the port has class 0 priority(lowest priority)

'01' – the port has class 1 priority

'10' – the port has class 2 priority

'11' – the port has class 3 priority(highest priority)

EnIPPr

Enable/disable IP prioritization

‘0’ – IP priority within the received packet (if exists) is ignored

‘1’ – IP priority within the received packet (if exists) is considered

EnVLPr

Enable/disable VLAN prioritization

‘0’ – VLAN priority within the received packet (if exists) is ignored

‘1’ – VLAN priority within the received packet (if exists) is considered

Selects one of four mappings for the 8 level precedence extracted

from frame’s IP header to the 4 CoS offered by TC9204M

(C0, C1, C2, C3 – class 0, 1, 2, 3 of service)

Designated priority class

IPTosMap[1:0]

Selects one of four mappings for the 8 level user_priority extracted

from the frame’s VLAN Tag to the 4 level priority offered by TC9204M

(C0, C1, C2, C3 – class 0, 1, 2, 3 of service)

Designated priority class

VLANPrMap[1:0]

Confidential.

18/49

July 29, 2003

TC9204M-DS-R05

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