參數(shù)資料
型號(hào)： TSS463C
廠商： Atmel Corp.
英文描述： VAN Data Link Controller with Serial Interface
中文描述： 凡數(shù)據(jù)與串行接口鏈路控制器
文件頁(yè)數(shù)： 47/59頁(yè)
文件大?。?/td> 492K
代理商： TSS463C
47
TSS463C
7601B–AUTO–02/06
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 46) 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 TSS463C 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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TSS463C-TERZ-9 制造商:Atmel Corporation 功能描述:
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TSS463D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC
TSS463R 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC
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