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UM0932 bảng dữ liệu(PDF) 9 Page - STMicroelectronics

tên linh kiện UM0932
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PDF  43 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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UM0932 bảng dữ liệu(HTML) 9 Page - STMicroelectronics

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UM0932
Functional overview
43
2.2
ST7580 Power line frames: structure
The ST7580 device can be configured by the external host to transmit and receive frames
over the power line in accordance with three different frames structures:
1.
Physical (PHY) frames, built with some differences between PSK and FSK modulations
(see [·]), as represented in Figure 2:
Figure 2. Physical frame structure
Table 2 lists the fields of PHY frame.
2.
Data Link (DL) frames, adding CRC field to physical SDU.
Figure 3 shows the frame structure:
Figure 3. Data link frame structure
The external host is allowed to choose the CRC algorithm used (length, endianness, fields
involved in calculation) through a dedicated MIB object (modem configuration 00h,
Section 4.2.1).
The length field is automatically handled by ST7580 and its value is by default equal to the
length of payload and CRC fields.
Table 2. PHY frame description
Field name
Length
Description and values
Length
1
Payload length. Allowable values: from 0 up to 255
Payload
Length
Data bytes



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