TSS463-AAR ATMEL [ATMEL Corporation], TSS463-AAR Datasheet - Page 42

• Manufacturer Part Number: TSS463-AAR
• Description: VAN Data Link Controller with Serial Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Mailbox
Figure 27. Message Buffer Structure for Reception
42
TSS463-AA
SOF
Message Length and Status Register
M_L [4..0]
Received DATA Frame, immediate or deffered reply
ID [11..0]
CHER CHTx CHRx
received
The mailbox contains all the messages received or to be transmitted. Each messages is
link to a channel. The Mailbox RAM area has 128 bytes and is mapped from 0x80 to
0xFF (see Section “Mapping”, page 26 ).
The message (or message buffer) is composed of:
•
•
The message is pointed by the Message Pointer Register of the channel, the length of
the message is given by the Message Length and Status Register of the channel. This
area is a pure RAM, it contains a random value after reset.
RAK
1 byte of message status (only used in receiving),
n bytes of data. These data are the bytes of the DATA field of the frame with the
same organization.
received
RNW
Received
Received
received
Message
RTR
DATA n
DATA 0
DATA 0
M_L [4..0] = n+1
received
M_P + 0x80 + n + 2
M_P + 0x80
DATA n
DRAK
Message Pointer Register
FCS
M_P [6..0]
EOF
4205B–AUTO–12/04