AMIS-49587_P2 Datasheet, PDF (49/55 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS--49587
Table 49. DESCRIPTION OF THE SpyData FIELD
Field Name
S0
N0
S1
N1
Threshold
Method
Length
2 Bytes
2 Bytes
2 Bytes
2 Bytes
2 Bytes
1 Byte
Description
Value of the zero signal envelope
Value of the zero noise envelope
Value of the one signal envelope
Value of the one noise envelope
Indicates the threshold value for ASK method or the FSK factor.
Indicates the found method:
0 ⇒ No method
1 ⇒ ASK0
2 ⇒ ASK1
3 ⇒ FSK (S0 ≅ S1)
4 ⇒ FSK0 (S0 > S1)
5 ⇒ FSK1 (S1 > S0)
PAD
Synchro_bit Value
1 Bit (b7)
3 Bits
(b6,b5,b4)
0
Synchronization bit value when synchronization was found
PAD
Reception Gain
1 Bit (b3)
3 Bits
(b2,b1,b0)
0
Indicates the gain value (0 to 7) used during the synchronization
7.4.6 SPY_SubFrame
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. For
the format of the SpyData field, see Table 49.
Frame Format:
<STX>
Length
0xB0 (Spy_SubFrame)
SpyData Field, PHY_sdu
CHK
7.4.7 SPY_Search_Synchro
The SPY_Search_Synchro is sent periodically by the AMIS--49587 local MAC sub--layer to indicate synchronization is in
progress.
Frame Format:
<STX>
Length
0xC0 (Spy_Search_Synchro)
CHK
7.4.8 SPY_Synchro_Found
The SPY_Synchro_Found is sent by the AMIS--49587 local MAC sub--layer as soon as it has correctly found
synchronization when it was receiving a sub--frame. Thus, it is now synchronized and it is waiting for another correct frame
for confirmation.
For the format of the SpyData field, see Table 49.
Frame Format:
<STX>
Length
0xD0 (Spy_ Synchro_Found)
SpyData
CHK
7.4.9 Spy_Alarm_Found
The SPY_No_Alarm_Found is sent by the AMIS--49587 local MAC sub--layer at the end of a time--slot, when it has not
found an Alarm indication in the pause time.
For the format of the SpyData field, see Table 49.
The AlarmPattern has a length of 2 bytes.
Frame Format:
<STX>
Length
0xF0 (SPY_ No_Alarm_Found)
SpyData, AlarmPattern
CHK
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