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TMS320F2808: CAN bit timing calculator

Part Number: TMS320F2808
Other Parts Discussed in Thread: TMS320F28335

I have been reading the reference guide SPRUEU0 for eCAN controller on TMS320x280x/2801x, where on page 40 in the BRP_reg states that the CAN module is clocked at the same frequency as the CPU( SYSCLKOUT).
However, the CAN bit timing calculator sheet gives instructions to input CAN clock frequency as SYSCLK/2 for eCAN.
Is it just the way the calculator is setup or am I missing something out?