CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
Table 11-7. Operation When Third Bit of Intermission Is “Dominant (D)”
Transmit Status
Operation
No pending transmissions
Receive operation is performed when start of frame output
by other node is detected.
Pending transmission exists
Identifier is transmitted when start of frame output by local
node is detected.
<9> Error frame
An error frame is used to output from a node in which an error has been detected.
When a passive error flag is being output, if there is “dominant (D)” output from another node, the
passive error flag does not end until 6 consecutive bits are detected on the same level. If the bit
following the 6 consecutive “recessive (R)” bits is “dominant (D)”, the error frame ends when the next
“recessive (R)” bit is detected.
Figure 11-18. Error Frame
<1>
R
D
<2>
<3>
6 bits
0 to 6 bits
8 bits
(<4>)
(<5>)
Interframe space or overload frame
Error delimiter
Error flag
Error flag
Error bit
Error frame
No
Name
Bit Count
Definition
Error active node
Consecutive output of 6
“dominant (D)” bits
<1>
Error flag
6
Error passive node
Consecutive output of 6
“recessive (R)” bits
<2>
Error flag
0 to 6
A node that receives an error flag is a node in which bit
stuffing errors are detected, after which an error flag is
output.
<3>
Error delimiter
8
8 consecutive “recessive (R)” bits are output.
If a “dominant (D)” bit is detected as the eighth bit, an
overload frame is sent starting at the next bit.
<4>
Error bit
–
This bit is output following the bit where an error occurred.
If the error is a CRC error, it is output following an ACK
delimiter.
<5>
Interframe space or
overload frame
3/10
20 MAX.
An interframe space or overload frame starts from here.
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