UM0934 datasheet(102/113 Pages) STMICROELECTRONICS

102 / 113 page

PHY mode communication example

UM0934

102/113

Doc ID 17389 Rev 2

Station1: CMD_DataRequest() from external host to ST7570, assuming a P_sdu = 00h

01h 02h … 25h:

Station2: CMD_SynchroIndication() sent from ST7570 to the external host. The

ST7570 modem received a PRE+SSD sequence correctly and it notified the change in

its synchronization status.

The S0, N0, S1, N1 fields can be decoded to obtain the RMS values (in dB

µV units):

●

S0: 19F6h = 6646d

⇒ 66.46 dBµV

RMS

●

N0: 1104h = 4356d

⇒ 43.56 dBµV

RMS

●

S1: 1A1Ah = 6682d

⇒ 71.848 dBµV

RMS

●

N1: FB6h = 4022d

⇒ 40.22 dBµV

RMS

Station2: CMD_DataIndication() sent from ST7570 to the external host to notify the

receipt of P_sdu.

The ASK0, ASK1, FSK, SNR0, and SNR1 fields can be decoded to obtain the estimated

values of the demodulated signals:

●

ASK0 = 00A9h: 169 bits equal to “0” decoded independently

●

ASK1 = 005Dh: 93 bits equal to “1” decoded independently

●

FSK = 002Ah: 42 bits decoded through measurements on both tones

●

SNR0 = 10913h = 67859d

⇒ 24.936 dBµV

RMS

●

SNR0 = FD33h = 64819d

⇒ 23.819 dBµV

RMS

Station1: CMD_DataConfirm() sent from ST7570 to the external host, meaning that the

transmission of the PHY frame over the power line has finished.

The only label in the data field is the Confirm_Code (Section 5.3.13) equal to the FFh value,

meaning that the P_SDU transmission was performed with no errors. The checksum is

equal to 155h value.

STX

Length

C ommand

Code

DATA

CHK

02h 29h

51h

00.01.02.03.04.05 .06.07.08.09.0A.0B.0C.0D.0E.0F.10.11.12.13.14.15.16.17.18.19.1A.1B.1C.1D.1 E.1 F.20.21.22.23.24.25h

39.03h

STX

Length

Command

Co de

DATA

CHK

4A.02h

AGC

phase

F6.19.00h 04.11.00h

1A.1A.00h

B6.0F.00h

08h

01h

00.01 .02.03.04.05.06.0 7.08.09.0A.0B.0C.0D.0E.0F.10.11.12.

13.14.15.16.17.18.19.1A.1B.1C.1D.1E.1F.20.21.22.23.24.25h

STX Length

Command

Code

DATA

CHK

02h 35h

50h

C1.05h

P_SDU

ASK0

ASK1

FSK

SNR1

SNR0

A9.00h 5D.00h 2A.00h 13.09.01h 33.FD.00h

STX

Length

Command

Co de

DATA

CHK

02h 04h

52h

55.01h

FFh

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