參數(shù)資料
型號(hào): TSS461F
廠商: Atmel Corp.
英文描述: VAN Data Link Controller
中文描述: 凡數(shù)據(jù)鏈路控制器
文件頁數(shù): 37/57頁
文件大?。?/td> 397K
代理商: TSS461F
37
7615A–AUTO–02/06
TSS461F
Message Length And
Status Register
The message length and status register at address (base_address + 0x03) is also 8 bits wide. It
indicates the length reserved for the message in the Message DATA RAM area.
Read/Write register.
M_L [4:0]: Message
Length
The 5 high bits of this register allow the user to specify either the length of the message to be
transmitted, or the maximum length of a message receivable in the pointed reception buffer.
Note, that the first byte in this register does not contain data, but the length of the message
received. This implies that the length value has to be equal to or greater than the maximum
length of a message to be received in this buffer (or the length of a message to be transmitted)
plus 1. Thus allowing a maximum length of 30 bytes and a minimum length of 0 byte.
If the value of this field is "illegal" (i.e 0x00) then this message pointer is defined as being a link
(see section “Message Pointer Register” and section “Linked Channels”).
CHER: Channel Error
Status and Abort
Command
As status, this bit is set by the TSS461F when error occurs in transmission or on a received
frame. The user must reset it.
To abort the transmission defined in the channel, this bit can be set to1 by the user (see
section “Retries, Rearbitrate and Abort” and section “Abort”).
CHTx: Channel
Transmitted and
Transmit Enable
Command
7
6
5
4
3
2
1
0
M_L 4
M_L 3
M_L 2
M_L 1
M_L 0
CHER
CHTx
CHRx
base_address
+ 0x03
M_L [4:0] = 0x00
Linked channel
M_L [4:0] = 0x01
Frame with no DATA field (*)
M_L [4:0] = 0x02
Frame with 1 DATA byte
- - - - - - -
- - - - - - - - - - - - - - - - - - - - - -
M_L [4:0] = 0x1D
Frame with 28 DATA bytes
M_L [4:0] = 0x1E
Frame with 29 DATA bytes
M_L [4:0] = 0x1F
Frame with 30 DATA bytes
(*) Different of a reply request frame with no in-frame reply (deferred reply).
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