UM0934 datasheet(101/113 Pages) STMICROELECTRONICS

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UM0934

PHY mode communication example

Doc ID 17389 Rev 2

101/113

PHY mode communication example

This example shows how to use the PHY data services (Section 3.5.1) in order to perform

the transmission of a PHY frame from station1 to station2 (Figure 29), with a detailed time

diagram of data exchanged on the UART interfaces of both stations (Figure 30).

It is assumed that both station1 and station2 have been initialized, in accordance with the

initialization procedure as in Section 8.1, and they have been further set with the same value

for MIB object 00A1h (with access layer mode equal to PHY), except for operating mode,

that is Client for station1 and Server for station2.

Figure 29.

Data communication

Figure 30.

Time diagram: host interface communication

The exchanged local frames, as in Figure 30, have the following syntaxes:

Powerline

network

STATION 1

STATION 2

ST7570

PHY

layer

ST7570

PHY

layer

External

host

External

host

P_Data.

request

P_Data.

confirm

P_Data.

indication

Powerline

network

P_SDU

PHY frame transmission

PRE

SSD

ACK

CMD_SyncIndication

(P_Sync .indication )

CMD_DataIndicatio n

(P_Data.indication )

TXD

Local Frame

T_REQ

ACK

RXD

T_REQ

TXD

RXD

CMD_DataRequest

(P_ Data.request )

ACK

Status

Local Frame

CMD_DataConfirm

(P_Data.confirm)

ACK

Local Frame

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