Re: [myhdl-list] Assignment to arbitrary bits of an intbv

[Christopher F. <chr...@gm...>]

On 5/23/2013 5:37 AM, Alastair McKinley wrote:
> Hi all,
>
> I have just started looking in myHDL and am quite excited about it's
> potential.
>
> I have a short question about assignment to intbv objects. I want to model
> closely a reference VHDL implementation which has a 128 bit input from a
> DMA engine.
>
<snip>
>
> The input signal to my module doesn't change in this case.
>
> What is the right way to do this in myHDL?
>
> Best regards,
>
> Alastair
>

Alastair,

Your example is incomplete, you don't show how you
define (instantiate) /inData/.  If inData is simply,
(as you imply):

     inData = Signal(intbv(0)[128:])

Then you have a small syntax error:

     inData[32:0].next = ...
     inData[64:32].next = ...

should be,

     inData.next[32:0] = ...
     inData.next[64:32] = ...


The syntax /inData[].next/ and /inData.next[]/ is the
difference between a list of signal item selection and
the bit vector bit selection.

Hope that helps,
Chris