参数资料
型号: TSS461CD
英文描述: LAN Node Controller
中文描述: 网络节点控制器
文件页数: 35/52页
文件大小: 268K
代理商: TSS461CD
TSS461C
35
Rev. D (22 Feb 01)
10. Mailbox
The mailbox contents 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 9.1.).
The message (or message buffer) is composed of:
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.
The message is pointed by the Message Pointer Register of the channel, the length of the message is given by the
Message Length & Status Register of the channel (sections 9.3.2. and 9.3.3.). This area is a pure RAM, it contents a
random value after reset.
CHER CHTx CHRx
Message Pointer Register
DRAK
M_P [6..0]
Message Length & Status Register
M_L [4..0]
RTR
received
RNW
received
RAK
received
M_L [4..0] = n+1
received
DATA 0
Message
DATA n
received
R
R
R
ID [11..0]
E
SOF
DATA 0
DATA n
FCS
E
A
EOF
Received DATA Frame, immediate or deffered reply
received
M_P + 0x80 + n + 2
(
M_P + 0x80
Figure 22. Message buffer structure for reception
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