AMIS-49587 Datasheet, PDF (23/59 Pages) ON Semiconductor – Power Line Carrier Modem

AMIS−49587
GENERAL DESCRIPTION OF THE FRAME FORMAT
The frame format is the same in both directions:
<STX>
Length
Command
User_Data
CHK
The fields are:
Table 29. LOCAL FRAME DESCRIPTION
Field
Byte Length
Value
Description
<STX>
1
02h
Start of text delimiter
Length
1
03h .. 250
Length of the Command, UserData fields and CHK.
Command
1
00h .. FEh
Command code (Command Codes)
User_Data
0..247
Byte String
Zero to 247 data bytes.
CHK
2
0000h .. 65535
The checksum of the local frame is the result of the addition of
the elements of the frame, from length up to the last UserData
byte, or up to the Command byte if there is no UserData byte.
The CHK is sent with LSB first.
Remark: As soon as a numeric value is greater than one byte (word, long...) it has to be sent in little endian format, that means
LSByte first.
AMIS−49587 USERS MODES
NOT SET MODE
In Not Set mode operation the AMIS−49587 software has
no configuration and waits for it. The AMIS−49587 is in this
mode after a power down or after a reset request.
MASTER MODE (CLIENT)
In MASTER mode operation the AMIS−49587 software
should only know its own address (Local MAC address).
The Initiator address (Initiator MAC address) is not used and
initialized with the NOBODY address (000h).
The Local MAC Address is in the range defined with the
WriteConfig_Request command (FIMA/LIMA).
SLAVE MODE (SERVER)
In the Application layer there is a SMAE (system
management application entity) which handles the server
recording. A server is New when it starts for the first time or
when the time−out not addressed has expired without a
dedicated call for it. Thus its local MAC address is equal to
NEW (FFE hex). After a power−up or a reset the
AMIS−49587 does not know its previous setup. Then it
informs the base micro it needs to be set by putting the bit
« NotSet » in the status message. The base micro has to set
the AMIS−49587 with the correct values using the
WriteConfig_Request command. When a remote station is
New (and then Unlocked), its Initiator MAC address is equal
to 000h. After registration this address should be in the range
FIMA/LIMA.
MONITOR MODE (SPY)
In MONITOR mode operation the AMIS−49587 software
works only in receiving mode and supplies to the base micro
all the physical sub−frames which have a good preamble and
SSD.
APPLICATION EXAMPLES FOR ADDRESS MAC
RANGE
Unlocked means that a Server has an Initiator MAC
address equal to NOBODY. Locked means that a Server has
a correct Initiator MAC address different from NOBODY.
Therefore this slave will only answer to this initiator.
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