751
Chapter 18
AFCAN Controller
User’s Manual U16580EE3V1UD00
18.2.5 Overload
frame
An overload frame is transmitted under the following conditions.
•
When the receiving node has not completed the reception operation
•
If a dominant level is detected at the first two bits during intermission
•
If a dominant level is detected at the last bit (7th bit) of the end of frame or at the last bit (8th bit) of
the error delimiter/overload delimiter
Note:
The CAN is internally fast enough to process all received frames not generating overload
frames.
Figure 18-16:
Overload frame
Note:
D: Dominant = 0
R: Recessive = 1
Table 18-8:
Definition of overload frame fields
No
Name
Bit count
Definition
<1>
Overload flag
6
Outputs 6 dominant-level bits consecutively.
<2>
Overload flag from other node
0 to 6
The node that received an overload flag in the interframe
space outputs an overload flag.
<3>
Overload delimiter
8
Outputs 8 recessive-level bits consecutively.
If a dominant level is detected at the 8th bit, an overload
frame is transmitted from the next bit.
<4>
Frame
–
Output following an end of frame, error delimiter, or overload
delimiter.
<5>
Interframe space/overload
frame
–
An interframe space or overload frame starts from here.
<1>
R
D
<2>
<3>
6 bits
0 to 6 bits
8 bits
(<4>)
(<5>)
Interframe space or overload frame
Overload delimiter
Overload flag
Overload flag
Frame
Overload frame
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