参数资料
型号: TSS461F
厂商: Atmel Corp.
英文描述: VAN Data Link Controller
中文描述: 凡数据链路控制器
文件页数: 39/57页
文件大小: 397K
代理商: TSS461F
39
7615A–AUTO–02/06
TSS461F
Mailbox
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:
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.
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.
Figure 22.
Message Buffer Structure for Reception
Note:
Received DATA Frame, immediate or deffered reply
CHER CHTx
CHRx
Message Pointer Register
M_P [6..0]
DRAK
Message Length & Status Register
M_L [4..0]
RTR
received
RNW
received
RAK
received
M_L [4..0] = n+1
received
DATA 0
Message
R
R
ID [11..0]
E
SOF
DATA 0
DATA n
FCS
E
A
EOF
received
DATA n
received
M_P + 0x80 + n + 2
(
M_P + 0x80
R
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