AMIS-49587 Datasheet, PDF (42/59 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
MONITOR MODE COMMANDS
DESCRIPTION
The monitor mode is used to spy the exchanged frames on the mains. It allows the user to check the transmission quality
in a definite point of the mains. In this mode, all the LTC and DB requests are allowed, but no MAC requests. The Physical
layer supplies directly the frames to the base micro.
THE COMMANDS AVAILABLE
SPY_No_SubFrame (Tag A0h)
Description: The SPY_No_SubFrame is sent by the AMIS−49587 local PHY layer to indicate that a sub−frame has not been
received correctly, due to either a method not found, or a non recognition of the Start Sub−frame Delimiter (SSD).
Syntax:
Initiator
AMIS−49587
Monitor
Command (arguments)
SPY_No_SubFrame (SpyData)
Possible Response
Frame Format :
<STX> Length
< SPY_No_SubFrame >
SpyData
CHK
Table 38. DESCRIPTION OF THE SPYDATA FIELD
Field Name
Length
Description
S0
2 Bytes
Value of the zero signal envelope
N0
2 Bytes
Value of the zero noise envelope
S1
2 Bytes
Value of the one signal envelope
N1
2 Bytes
Value of the one noise envelope
Threshold
2 Bytes
Indicates the threshold value for ASK method or the FSK factor.
Method
1 Byte
Indicates the found method:
0 ⇒ No method
1 ⇒ ASK0
2 ⇒ ASK1
3 ⇒ FSK (S0 ≅ S1)
4 ⇒ FSK0 (S0 > S1)
5 FSK1 (S1 > S0)
PAD
1 Bit (b7) 0
Synchro_bit Value
3 Bits
(b6,b5,b4)
Synchronisation bit value when synchronisation was found
PAD
1 Bit (b3) 0
Reception Gain
3 Bits
(b2,b1,b0)
Indicates the gain value (0 to 7) used during the synchronization
SPY_SubFrame (Tag B0h)
Description: The SPY_SubFrame is sent by the AMIS−49587 local PHY layer to indicate that a sub−frame has been correctly
received. All information concerning the reception conditions (SpyData) and the data (PHY_sdu) are supplied in this
command. Format of the SpyData field: see Table 38: Description of the SpyData field. Format of the PHY_sdu field: see [2]
Sections Status Message and Master Mode (Client).
Syntax:
Initiator
AMIS−49587
Monitor
Command (arguments)
Spy_SubFrame (SpyData, PHY_sdu)
Possible Response
Frame Format :
<STX> Length
< Spy_SubFrame >
SpyData, PHY_sdu
CHK
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