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MPC5777: CANFD & CAN Bit rate calculations.

Question asked by Sivakumar Uppaluri on Apr 10, 2015
Latest reply on Apr 4, 2017 by yalamanda dosakyala

Hello ,

 

I'm implementing the CAN Driver for MPC5777 ,for the BIT rate calculations i assumed the SYNC value to be 1 which is standard across the Controllers.

I reviewed the application notes AN5045 which also says that SYNC value is always 1 and non programmable . But the MPC5777 reference manual specifies SYNC value as 3

[FTSEG1 + FTSEG2 + 3] & [TSEG1 + TSEG2 + 3].

 

When i assumed the SYNC value as 1 and calculated the BIT rate the CAN communication never worked but with SYNC value 3 it was perfect.

 

Can any one explain why the SYNC value is 3?

 

Thanks,
Siva.

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