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| 型号： | TSS463A-TERZ |
| 厂商： | Atmel Corp. |
| 英文描述： | VAN Data Link Controller with Serial Interface |
| 中文描述： | 凡数据与串行接口链路控制器 |
| 文件页数： | 48/60页 |
| 文件大小： | 816K |
| 代理商： | TSS463A-TERZ |
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48
TSS463-AA
4205B–AUTO–12/04
Retries
The purpose of the retries feature is to provide, for the user, the capability of retrying a
transmit request in case of failure, when a node tries to reach another node, either on
normal DATA frame or on REPLY REQUEST frame.
The maximum number of retries is programmable through MR[3:0] of the Transmit Con-
trol Register (0x01). When a channel is enable – bit CHTx = 0 of Message Length and
Status Register, a 4-bit counter is loaded with MR[3:0]. At each attempt, this counter will
count-down to 0, an IT TE is set in the Interrupt Status Register (0x09), and the trans-
mission is stopped.
MR[3:0] = 1 indicates 1 retry, hence 2 transmission attempts will be performed (see
Table 5, “Retries,” on page 28). The number of retries performed, as well as the current
channel number associated, can be read in the Transmission Status Register (0x05).
The Last Error Status Register (0x07) informs about the trouble uncounted:
Failure cases:
–
Code viol (CV error bit)
–
Acknowledge error (ACKE error bit)
–
CRC error (FCSE error bit)
It should be noticed that contention is considered as normal CSMA/CD protocol
and, therefore, is not taken into account in failure cases. So, an 'infinite' number of
attempts can be performed if bus contention occurs continuously.
There is only one retry counter for all channels. When the user writes the Max_Retries
value, all channels start their transmission with this parameter.
Rearbitrate
The purpose of rearbitrate feature is to postpone a channel already in transmission in
order to authorize an higher priority (see Section "Priority Among the Different Chan-
nels", page 47) message to be transmit.
Typical Example
Max_retries = 1 (2 transmissions attempts).
If Ch8 is in a the retry loop and the user wants to transmit the Ch5 without waiting
the end of the loop, the user can use the rearbitrate command.
The TSS463AA will then wait until the end of the current transmission, reload the
retries counter and enable the Ch5 to transmit.
At the end of this transmission Ch5, either when the attempt is successful or the
exceeded retry count is reached, the retries counter is reloaded and the
transmission is activated for the Ch8 again.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TSS463B | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Serial VAN Data Link Controller |
| TSS463B_03 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Serial VAN Data Link Controller |
| TSS463B_04 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:VAN Data Link Controller with Serial Interface |
| TSS463B-TERA | 制造商:Temic 功能描述:LAN Node Controller, 16 Pin, SOP |
| TSS463B-TERA-9 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:VAN Data Link Controller with Serial Interface |
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