Length of the Data Field

DLC CAN:
9 possible lengths

The Data Length Code (DLC) had already consisted of four bits under traditional CAN. With this it is possible to describe the nine possible legal lengths of the data field, i.e. 0 to 8 bytes.

DLC CAN FD:
16 possible lengths

Now the DLC's remaining seven values 9 through 15 will be used for CAN FD. However the linear correlation between DLC and the number of bytes is abandoned for DLC > 8. The following table displays the different meanings the DLC has for the size of the data field under CAN and CAN FD:

DLCData Field Bytes
CAN		Data Field Bytes
CAN FD
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
9 8 12
10 8 16
11 8 20
12 8 24
13 8 32
14 8 48
15 8 64

Last modified: Wednesday, 22 September 2021, 4:21 PM