AMIS-49587 Datasheet, PDF (26/59 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
LOCAL TRANSFER AND CONFIGURATION COMMANDS (LTC)
DESCRIPTION
The Local Transfer and Configuration Commands (LTC)
supplies the following services:
• WriteConfigNew_Request: This command is used by
the Base Micro to set the configuration in the
AMIS−49587. The AMIS−49587 does not need to be
reset before but some parameters cannot be changed
without a reset
• WriteConfigNew_Confirm: This command is sent by
the AMIS−49587 to answer to a correct
WriteConfigNew_Request. Its data is the result of the
memory and register reading.
WriteConfigNew_Error: This commands is sent by the
AMIS−49587 to answer to an incorrect
WriteConfigNew_Request. It contains an Error_Code
that indicates which error has been detected.
• TestMode_Request: This command is used by the
Base Micro to put the AMIS−49587 in a special mode.
It is used to perform tests on emission level.
• Reset_Request: The Reset_Request is used to reset the
AMIS−49587 by software when the Base Micro wants
to do it.
• Synchro_Indication: This command is sent by the
AMIS−49587 to inform about the new synchronization
state. Three possibilities could be performed:
synchronization found, synchronization confirmed, and
synchronization lost. Specific data are associated with
each command.
• Desynchro_Request: This command is used by the
Base Micro to set the AMIS−49587 in the not
synchronized state and therefore it starts looking for the
synchronization.
CONFIGURATION COMMANDS
Description
The configuration allows to send to AMIS−49587 all the
parameters it needs to work correctly. Most of these
parameters are also accessible by a WriteDB_request.
The configuration version 3 is the same as the one used on
the previous versions of AMIS−49587, but some additional
functionalities are available. To ensure a perfect
compatibility with the old versions, make sure that:
• the bits corresponding to the number of alarm
repetitions are set to 0 (to disable the alarm
functionality)
• the bit corresponding to Bad CRC Frame transmitting is
set to 0 (to disable this functionality)
• The bits corresponding to the baudrate are set to 10 for
1200 bauds (since 11 will put the AMIS−49587 at 2400
bauds)
• The bits corresponding to the Search Method and SINC
Filter are set to 0
• Intelligent synchronization
The configuration version 4 enables is a bit different than
the version 3, and it enables one more functionality : the
intelligent synchronization. All the new functionalities are
also available with this configuration as well as with
configuration version 3.
WriteConfigNew_Request (Tag 71h)
Description: The field Data_Config contains the future configuration of the AMIS−49587 (36 bytes). This field is structured
as shown in 7.4.4.
Syntax:
Not Set
Initiator
Command (arguments)
Possible Response
Base Micro
WriteConfigNew_Request (Data_Config)
WriteConfigNew_confirm (Data_Config_Echo)
WriteConfigNew_Error (Error_Code)
Since the AMIS−49587 has no non−volatile RAM memory, the information about the chip configuration are lost after each
hard or soft reset and also after a power up.
Therefore the AMIS−49587 software waits for a WriteConfig_Request or WriteConfigNew_Request after each reset. The
software remains in this state until the configuration is correctly received.
Frame Format:
<STX>
Length
<WriteConfigNew_Request>
Data_Config
CHK
Notice: New Functionality: This command can be used to modify several parameters of the AMIS−49587 at the same time,
even if AMIS−49587 is configured yet. This avoids the use of several successive Write_Db.Request. If the AMIS−49587 is
set yet, some parameters cannot be changed any more and won’t be taken into account. The AMIS−49587 will return a
WriteConfig_Error if the Base Micro tries to modify one of these parameters:
http://onsemi.com
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