TSS461 ATMEL Corporation, TSS461 Datasheet - Page 39

• Manufacturer Part Number: TSS461
• Description: VAN Data Link Controller
• Manufacturer: ATMEL Corporation

Mailbox
Figure 22. Message Buffer Structure for Reception
Note:
4194C–AUTO–01/06
Received DATA Frame, immediate or deffered reply
SOF
Message Length & Status Register
M_L [4..0]
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”).
The message (or message buffer) is composed of:
•
•
The message is pointed by the Message Pointer Register of the channel, the length of the mes-
sage is given by the Message Length & Status Register of the channel (section “Message
Pointer Register” and section “Message Length And Status Register”). This area is a pure RAM,
it contains a random value after reset.
ID [11..0]
CHER CHTx CHRx
1 byte of message status (only used in receiving)
Bytes of data. These data are the bytes of the DATA field of the frame with the same
organization.
received
RAK
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]
TSS461E
EOF
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