参数资料
型号: CAN-100
厂商: Fujitsu Semiconductor America Inc
文件页数: 90/104页
文件大小: 0K
描述: BOARD EVAL RS232 100QFP
其它有关文件: CAN-100 Schematic
标准包装: 1
系列: FR
类型: MCU
适用于相关产品: MB91F267N
所含物品: 板,BLDC 电机,线缆,电源
产品目录页面: 722 (CN2011-ZH PDF)
相关产品: 865-1091-ND - IC MCU FLASH 128KB FLASH 64LQFP
其它名称: 865-1102
AN07-00180-3E
5.2.3
Error management
CAN error management is defined in its protocol. Five types of error detection and three types of status
are used.
1.
Error detection
As shown in “ Table 5-1 Description of the error types ”, errors that can be detected depends on
whether the node is transmitting or receiving.
Table 5-1 Description of the error types
Error type
Bit error
Transmitting
node
Receiving
node
-
Description
Detected if there is a difference between the
transmitted data and the bus level.
ACK error
-
Detected
if
an
acknowledgement
to
transmission cannot be obtained.
Stuff error
-
Detected if bit stuffing is not applied.
Bit
stuffing is to set an inverted bit by 5 bits if
the number of successive bits with the same
level is 5 or more. This prevents bits with the
same level from being successive over 6 bits.
CRC error
-
Detected if CRC (cyclic redundancy check)
fails on the received data.
Format error
-
Detected if the received data does not
confirm to any of the frame formats.
2.
Statuses
Each node has error counters whose value depends on the status. The error counters of the nodes
are named TEC (transmit error count) and REC (receive error count) intending transmission and
reception. The three statuses are as described below.
Status
Error active
Error passive
Bus off
Description
The node is normally joining in the bus.
The node has frequent errors so it is influencing the bus.
The node is disconnected from the bus. To restore to the bus, the bus needs to
satisfy the restoration condition.
- 90 -
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