UM0934 datasheet(28/113 Pages) STMICROELECTRONICS

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MAC layer

UM0934

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Doc ID 17389 Rev 2

4.5.1

Local MAC address

Each station in the network is identified through a unique local MAC address, stored in the

MIB object 0001h (local MAC address, Section 6.5.2). When the node has been configured

as Server or Monitor, by default, the initial value for the local MAC address is NEW (FFEh).

When the node has been configured as Client, the local MAC address is automatically set

equal to FIMA address. It is then the responsibility of the upper layers to assign a unique

address to each station within the range address space (000h-FFFh).

4.5.2

Address space

The available address space, ranging from 000h up to FFFh, is allocated to nodes belonging

to the network according to:

●

The node type (Client or Server)

●

Application related parameters, programmable through MIB objects:

–

First initiator MAC address (FIMA) is the first address available for Clients

–

Last initiator MAC address (LIMA) is the last address available for Clients

Refer to Table 5 for local MAC address fixed values.

4.5.3

Reception

When a valid long MAC frame is received by a server, the MAC compares the destination

address (DA) and the local MAC address and generates an M_Data.Indication(DA, SA,

M_sdu) if at least one of the following cases is verified:

●

DA matches the local MAC address

●

DA matches one of the group addresses

●

DA is the broadcast address.

In the case of a Client receiving the long frame, it generates an M_Data.Indication(DA, SA,

M_sdu) regardless of the originator and destination of the frame.

Table 5.

Local MAC address

Value

Description

000h

Reserved

001h

Server

...

FIMA-1

FIMA

Client

...

LIMA

FFCh

Reserved

FFEh

New

FFFh

Reserved

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