Hi, Tatlinar,
Pls refer to the section in RM of K30, I copy it here:
"
3.9.1.3 Number of message buffers
Each FlexCAN module contains 16 message buffers. Each message buffer is 16 bytes.
"
It means that the RAM size is 16* 16=256 bytes.
Hope it can help you
BR
Xiangjun Rong