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TMS320F28379D: SDFM sincfast transfer function?

Part Number: TMS320F28379D

Hoping to find the transfer function for the sincfast filter configuration of the Sigma Delta Filter Module (SDFM).

The data sheet (SPRUHM8I) has the transfer function for sinc1, sinc2, and sinc3 filters, and it is clear from the bode plots (data sheet and this app note) that the sincfast filter configuration works a bit differently, but I can't find any other details anywhere. 

Related to this post.

Is the sincfast filter transfer function published somewhere?

Thank you!