FIR Megafunction Signed (Fractional) Binary only?

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Why isn't there a twos-complement option?

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Both are 2's compliment. Signed fractional binary format results in the same hardware implementation as signed binary format, the binary point is conceptual only.

Its quite possible the GUI displays things differently, or the coefficients can be passed in as fractional integers represented as what appear to be floating point values in a text file, but ultimately the hardware will look the same.

Cheers,

Dave

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Both are 2's compliment. Signed fractional binary format results in the same hardware implementation as signed binary format, the binary point is conceptual only.

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I buy that numerically it doesn't matter whether the integers are fractional or not (and I don't know why the GUI gives the option). But it seems that the signed binary representation is the same as sign-magnitude (http://en.wikipedia.org/wiki/signed_number_representations#sign-and-magnitude_method) representation, and not the same as two's-complement (http://en.wikipedia.org/wiki/two%27s_complement). The manual isn't very clear on this.

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But it seems that the signed binary representation is the same as sign-magnitude (http://en.wikipedia.org/wiki/signed_number_representations#sign-and-magnitude_method) representation, and not the same as two's-complement (http://en.wikipedia.org/wiki/two%27s_complement). The manual isn't very clear on this.

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The manuals are not very clear on a lot of things :)

FIR compiler will be using 2's compliment.

Cheers,

Dave