UM0934 datasheet(24/113 Pages) STMICROELECTRONICS

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MAC layer

UM0934

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Doc ID 17389 Rev 2

4.3.2

Alarm services

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

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

Three primitives are available:

●

M_Alarm.Request(): to ask the MAC layer for the transmission of an alarm

●

M_Alarm.Confirm(T_result): generated by the MAC layer as a response to a previous

M_Alarm.Request with the result of transmission (T_result)

●

M_Alarm.Indication(): generated by the MAC layer as soon as an alarm coming from

the power line has been received.

Figure 8.

MAC alarm services

4.3.3

Synchronization services

The synchronization services provided by the MAC layer allow the upper protocol layers

(embedded in the external host) to manage the time-slot synchronization.

Two primitives are available:

●

M_Sync.Request(): to ask the MAC layer for the rejection of the current time-slot

synchronization (if any)

●

M_Sync.Indication(S_state): generated by the MAC layer as soon as a change in the

time-slot synchronization has happened, with a description of the status (S_state).

P_Alarm.request

P_Alarm.confirm

PHY

Layer

MAC

Layer

Local Node

Power Line

M_Alarm.request

M_Alarm.confirm

Upper

Layers

(ext. Host)

ST7570

P_Alarm.indication

MAC

Layer

PHY

Layer

Remote Node

M_Alarm.indication

Upper

Layers

(ext. Host)

ST7570

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