Re: [myhdl-list] fixed-point thoughts : part one

[Martin T. <mar...@tr...>]

Christopher Felton <chr...@gm...> writes:

<snip>
This sounds like an excellent addition to MyHDL's capabilities...

> Example:
> 	s : sign bit
> 	i : integer bits
> 	f : fractional bits
>
> 	siii.ffff
>

I have in the past needed values of this form:

s0.00fff

i.e. three bits of precision representing a small range either side of zero

when using Xilinx System Generator there was not a convenient way to
represent them using their fixed-point types other than using integers
and remembering to shift them.

It would be nice if your proposal could represent these types of numbers too.

Would an initialiser of this form work I wonder?

 	x = fixbv(0.033, min=-0.25, max=0.25, res=0.001)


Cheers,
Martin

-- 
mar...@tr... 
TRW Conekt - Consultancy in Engineering, Knowledge and Technology
http://www.conekt.co.uk/capabilities/39-electronic-hardware