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UM0934 датащи(PDF) 108 Page - STMicroelectronics

номер детали UM0934
подробное описание детали  ST7570 S-FSK power line networking System-on-Chip
PDF  113 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0934 датащи(HTML) 108 Page - STMicroelectronics

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MAC mode communication example
UM0934
108/113
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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