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Unclear IIR function in CCES 2.9 Compiler for BlackFin

Category: Software
Product Number: BF706
Software Version: CCES 2.10.0

Description for IIR function in CCES BlackFin compiler library manual is:

1- What are Dm, Am, Ym?

2- Usually A1,A2 are with negative sign if we're referencing a standard difference equation:


why they have positive sign in denumerator?

2- Domain [-1,1) means input x should be scaled to be in [-1,1) range before being fed to function?

For iirdf1 function, it has following description. A1,A2 in denum have negative signs as opposed to IIR above. Why these 2 are different? Which is correct form?