NEC UPD703116 User Manual page 534

<10> Overload frame
An overload frame is output starting from the first bit in an intermission in cases where the receiving
node is not yet ready to receive.
If a bit error is detected in intermission mode, it is output starting from the bit following the bit where
the bit error was detected.
R
D
(<4>)
No Name
<1> Overload flag starting from
node m
<2> Overload flag starting from
node n
<3> Overload delimiter
<4> Frame
<5> Interframe space or
overload frame
n ≠ m
Remark
534
CHAPTER 11 FCAN CONTROLLER
Figure 11-20. Overload Frame
Overload frame
<1> <2> <3>
6 bits 0 to 6 bits 8 bits
Bit count
6 Consecutive output of 6 "dominant (D)" bits.
Output when node m is not ready to receive.
0 to 6 Node n, which has received an overload flag in the
interframe space, outputs an overload flag.
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.
– Output following an end of frame, error delimiter, or
overload delimiter.
3/10 An interframe space or overload frame starts from here.
20 MAX.
User's Manual U14492EJ5V0UD
(<5>)
Interframe space or overload frame
Overload delimiter
Overload flag (node n)
Overload flag (node m)
Frame
Definition