749
Chapter 18
AFCAN Controller
User’s Manual U16580EE3V1UD00
(h) Interframe space
The interframe space is inserted after a data frame, remote frame, error frame, or overload frame
to separate one frame from the next.
•
The bus state differs depending on the error status.
– Error active node
The interframe space consists of a 3-bit intermission field and a bus idle field.
Figure 18-13:
Interframe space (error active node)
Notes: 1.
Bus idle: State in which the bus is not used by any node.
2.
D: Dominant = 0
R: Recessive = 1
– Error passive node
The interframe space consists of an intermission field, a suspend transmission field, and a bus idle
field.
Figure 18-14:
Interframe space (error passive node)
Notes: 1.
Bus idle:
State in which the bus is not used by any node.
Suspend transmission:
Sequence of 8 recessive-level bits transmitted
from the node in the error passive status.
2.
D: Dominant = 0
R: Recessive = 1
Usually, the intermission field is 3 bits. If the transmitting node detects a dominant level at the third
bit of the intermission field, however, it executes transmission.
R
D
Interframe space
Intermission
(3 bits)
Bus idle
(0 to
∞
bits)
(Frame)
(Frame)
R
D
Interframe space
Intermission
(3 bits)
Suspend transmission
(8 bits)
Bus idle
(0 to
∞
bits)
(Frame)
(Frame)
Содержание V850E/PH2
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