msm9225 Oki Semiconductor, msm9225 Datasheet - Page 48

• Manufacturer Part Number: msm9225
• Description: Can Controller Area Network Controller
• Manufacturer: Oki Semiconductor

(3) Description of each frame
The start-of-frame begins when the bus line level changes.
If "dominant" is detected at the sample point, reception continues.
If "recessive" is detected at the sample point, the bus becomes idle.
* Notes:
¡ Semiconductor
R
D
R
D
Extended format mode
Standard format mode
ID28 to ID0 is the identifier.
The identifier is transmitted MSB first.
It is prohibited to set the identifier = 1111111XXXXX.
(a) Start-of-frame
Start-of-frame indicates the beginning of a data frame or remote frame and is one dominant
bit.
(b) Arbitration field
This field sets priority and data frame/remote frame protocol modes.
The arbitration field consists of an identifier, RTR bit, and extended format setting bits.
ID28
ID28
Identifier
(11 bits)
Arbitration field
Identifier
(11 bits)
(Interframe space
R
D
or bus idle)
ID18
ID18
(1 bit)
(1 bit)
RTR
SRR
Arbitration field
(1 bit)
(r1)
IDE
(1 bit)
(Control field)
IDE
Start-of-frame
ID17
1 bit
r0
Identifier
(18 bits)
(Arbitration field)
ID0
(1 bit)
RTR
r1
(Control field)
r0
MSM9225
48/73