UM0934 datasheet(18/113 Pages) STMICROELECTRONICS

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Physical layer

UM0934

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Doc ID 17389 Rev 2

Figure 5.

PHY synchronization services

3.6

Additional features

The ST7570 embeds additional features in the PHY layer to collect or estimate additional

information useful for MAC and upper layers.

3.6.1

Signal and noise estimation

The ST7570 performs an estimation of signal and noise on every received physical frame.

Two estimations are provided, with different accuracy:

●

Raw estimation: performed on PRE+SSD sequence

●

Fine estimation: performed on P_sdu.

Raw estimation

This function provides an estimation of signal and noise amplitudes, as detected by the

ST7570 at the RX_IN pin. Signal and noise amplitudes are estimated separately on channel

0 and channel 1 during the preamble (PRE) and SSD sequence (4 bytes). The estimated

amplitudes are stored in the MIB objects 000Dh (S0, N0, PGA, Section 6.5.14) and 000Eh

(S1, N1, phase, Section 6.5.15) and provided through unsolicited indications

(CMD_SynchroIndication, Section 5.3.1, and SPY_SynchroFoundIndication,

Section 5.3.20).

In order to convert from a raw number (“value” as stored in the MIB) to an RMS voltage

value expressed in dB

µV, use Equation 1:

P_Sync.request

P_Sync.indication

PHY

Layer

Embedded MAC layer

or external Host

Local Node

Power Line

New time-slot

synchronization

Current time-slot

synchronization

Is rejected

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