UM0934 datasheet(23/113 Pages) STMICROELECTRONICS

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UM0934

MAC layer

Doc ID 17389 Rev 2

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4.3

Services

The following services are available:

●

Data services: to transmit and receive data on the power line

●

Alarm services: to transmit and receive alarms on the power line

●

Synchronization services: to notify or reject a time-slot synchronization.

4.3.1

Data services

The data services provided by the MAC layer allow the upper protocol layers (embedded in

the external host) to manage data transfer on the power line.

Three primitives are available:

●

M_Data.Request(DA, M_sdu, IC, CC, DC): to ask the MAC layer for the transmission of

data M_sdu on the power line to a destination node whose local MAC address is DA

with credit values IC, CC and DC, (see Section 4.8)

●

M_Data.Confirm(T_status): generated by the MAC layer as a response to a previous

M_Data.Request with the result of the transmission (T_status)

●

M_Data.Indication(DA, SA, M_sdu, IC, CC, DC): generated by the MAC layer as soon

as data M_sdu coming from the power line has been received. The local MAC address

of the sender is SA, the destination address is DA while credit values are IC, CC and

DC.

Figure 7.

MAC data services

P_Data.request

P_Data.confirm

PHY

Layer

MAC

Layer

Local Node

Power Line

M_Data.request

M_Data.confirm

Upper

Layers

(ext. Host)

ST7570

P_Data.indication

MAC

Layer

PHY

Layer

Remote Node

M_Data.indication

Upper

Layers

(ext. Host)

ST7570

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