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UM0934 Datasheet(PDF) 106 Page - STMicroelectronics

Part # UM0934
Description  ST7570 S-FSK power line networking System-on-Chip
PDF  113 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0934 Datasheet(HTML) 106 Page - STMicroelectronics

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MAC mode communication example
UM0934
106/113
Doc ID 17389 Rev 2
10.3
Step 3: Transmitting a MAC frame from Client to Server
After having configured both station1 and station2, it is now possible to send a MAC frame
from station1 (Client) to station2 (Server). The external host of station1 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=001h.
Figure 32
shows the exchanged local frames during a transmission from Client to Server:
Figure 32.
Host interface communication during a MAC frame transmission from
Client to Server on power line
10.3.1
Station1 (Client)
CMD_Data Request
The local frame encapsulating the CMD_DataRequest():
The credit and address fields are filled as follows:
●
IC=000b, CC=000b, DC=00b
⇒ 00h
●
SA: C00h, DA: 001h
⇒ C0.00.01h.
This request causes the modem to start the transmission of the MAC frame over the power
line.
Powerline
network
P_SDU
MAC frame transmission
PRE
SSD
ACK
CMD_Sync
Indication
CMD_Data
Indication
TXD
Local Frame
Local Frame
T_REQ
ACK
RXD
T_REQ
TXD
RXD
CMD_Data
Request
ACK
Status
Local Frame
CMD_Data
Confirm
ACK
Local Frame
CMD_Sync
Indication
ACK
Local Frame
STX Length
Command
Code
DATA
CHK
02h 22h
51h
79.02h
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



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