AMIS-49587 Datasheet, PDF (44/59 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
APPENDICES
APPENDIX A: SPECIFIC BEHAVOURS
Envelope calculation method
The envelops are calculated using sqrt values or absolute values, depending on the baudrate and on the main frequency. The
following table describes the different modes :
Synchro
Reception
300, 600, 1200 bps
50 Hz
60 Hz
Sqrt
Sqrt
Sqrt
Sqrt
50 Hz
ABS
Sqrt
2400 bps
60 Hz
ABS
ABS
Improvement of FSK
When FSK+ option is enabled, new thresholds are calculated. Than if the two envelops are under the threshold, the envelop
which has the smallest gap with his threshold is used to determinate which bit is received. Or, if the two envelops are over the
threshold, the envelop which has the biggest gap with his threshold is used.
Conflict Between Mains And Base Micro
When the AMIS−49587 receives in the same time (same time−slot) an MA_Data_Request from the base micro and a frame
made up of one sub−frame with a repetition credit at zero from the mains, it ignores the frame received from the mains. In all
other conflict cases, it refuses the base micro request as described in Section Arbitration and Transfer.
Modifications of Time−Out Values in Slave Mode
When a time−out is written with a NULL value using either the WriteConfig_Request or the
WriteDB_Request command, this time−out will not be activated.
After a WriteDB_Request for either the Time−out−not−addressed or the Time−out−frame−not−ok, the new
value is immediately taken in account (the time−out is restarted) excepted when the local mac address is
NEW and the initiator mac address is nobody.
Modifications of MAC−Addresses in Slave Mode
A modification of Local and/or Initiator MAC address using the WriteConfig_Request or the WriteDB_Request, can provoke
some modifications of data. It is supposed that the Local MAC address (LMAC) and the Initiator MAC address (IMAC) are
both corrects (LMAC < FIMA and FIMA <= IMAC <=LIMA).
The charts below try to summarise these behaviours.
Case of WriteConfig
WriteConfig
(always in Not Set mode)
LMAC
IMAC
Specific Behaviour
NEW
NOBODY
(Note 24)
NEW
≠ NOBODY
⇒ Start Time−out−not−addressed (Note 24)
≠ NEW
≠ NOBODY
⇒ Start Time−out−not−addressed (Note 24)
≠ NEW
NOBODY
⇒ Start Time−out−not−addressed (Note 24)
24. After receiving the configuration, the AMIS−49587 starts looking for synchronisation.
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