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UM0934 Datasheet(PDF) 35 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) 35 Page - STMicroelectronics

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UM0934
MAC layer
Doc ID 17389 Rev 2
35/113
4.9
Additional features
4.9.1
Delta-phase detection at 2400 bps baud rate
When the ST7570 is running at 2400 bps, the delta-phase detection is affected by
±180°
ambiguity, due to the fact that time-slots start alternatively on positive zero-crossing or
negative zero-crossing.
In order to remove such ambiguity, the transmitter can be forced to start the transmission of
a new frame on a positive zero-crossing only. The detection algorithm in the receiver can be
adapted in the same way.
MIB object 0013h (smart-phase detection) can be used to configure this special feature.
Admitted values and corresponding behavior during transmission and reception are shown
in Table 8:
The typical configuration is TX for a Client and RX for a Server.
If enabled, the phase estimated by the smart-phase detection is written in the MIB object
0014h (Phase). This object is updated only when the sender of the frame was an initiator
(i.e. the source MAC address is in the range FIMA – LIMA of the receiver).
Table 8.
Delta-phase detection
Value Name
Behavior
Transmission
Delta-phase detection (reception)
0
DISA
BLED
The transmission of a new PHY frame starts on
a positive or negative zero-crossing.
Normal.
1TX
The transmission of a new PHY frame starts on
a positive zero-crossing only.
Normal.
2RX
The transmission of a new PHY frame starts on
a positive or negative zero-crossing.
Delta-phase detection is calculated
taking into account all MAC frame
fields.
3TXRX
The transmission of a new PHY frame starts on
a positive zero-crossing only.
Delta-phase detection is calculated
taking into account all MAC frame
fields.



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