UM0934 datasheet(108/113 Pages) STMICROELECTRONICS

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MAC mode communication example

UM0934

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Doc ID 17389 Rev 2

CMD_DataIndication

As soon as the whole MAC frame is received (assuming that no corruption occurred),

station2 notifies the reception of the M_sdu through a CMD_DataIndication() as follows:

Below is the meaning of the sub-fields encapsulated in the data field:

●

Credit = 00h

⇒ IC=000b, CC=000b, DC=00b

●

Address = C0.00.01h

⇒ SA: C00h, DA: 001h

●

M_sdu = 00h 01h ... 18h 19h.

10.4

Step 4: Transmitting a MAC frame from Server to Client

Thanks to the valid MAC frame received from station1, station2 is now synchronized and

able to send frames.

The external host of station2 can initiate the transmission by sending a CMD_DataRequest

to the ST7570 with the following sample parameters:

●

M_sdu = 00h 01h 02h ... 18h 19h

●

IC=0, CC=0, DC=0

●

DA=C00h.

Figure 33

shows the exchanged local frames during a transmission from Server to Client:

Figure 33.

MAC frame transmission from Server to Client

STX Length

Command

Code

DATA

CHK

02h 22h

50h

78.02h

Pad

00h

Addres s

C0.00.0 1h

Credit

00h

00.01 .02.03.04.05.06.07.08.09.0A.0B.0C.0D.0E.0F.10.11.12.13.14.15.16.17.18.19h

M_SDU

Powerline

network

P_SDU

PHY frame transmission

PRE

SSD

CMD_Data

Indication

TXD

Local Frame

T_REQ

ACK

RXD

T_REQ

TXD

RXD

CMD_Data

Request

ACK

Status

Local Frame

CMD_Data

Confirm

ACK

Local Frame

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