AMIS-49587_15 Datasheet, PDF (50/56 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
Table 49. 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
Method
2 Bytes
1 Byte
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
1 Bit (b3) 0
Reception Gain
3 Bits
(b2,b1,b0)
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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