Re: gEDA-user: blue sky ideas - written down finally

[Steven Michalske <smichalske@xxxxxxxxx>]

On Jan 8, 2010, at 12:29 PM, DJ Delorie wrote:

>
> Right, [] is "grouping" and how you map groups to each other
> determines the functionality.  The syntax is based on "what should be
> obvious"...
>
> [a b c] = [x y z] maps all of a group of signals to a group of pins,  
> 1:1
>
> a = [x y z] maps one signal to a group of pins, one-to-many
>
> [a b c] = x doesn't make sense (or at least isn't obvious), so is  
> not allowed.
>
>
> [a b] = [x y z] is not allowed, because it's not obvious what you  
> mean, but...
> [a b] = [[x y] z] is allowed.  a-> both x and y, and b->z, as is...
> [a b] = [(x y) z] is allowed.  a-> either x or y, and b->z.
>
> a = (x y z) maps a signal to one of a group of pins, one-to-one
>
> [a b y] = ([1 2 3] [4 5 6] [7 8 9]) maps all of a group of signals to
> 	all of one group of pins, chosen from a list of groups.
>
> a = ([1 2 3] [4 5 6] [7 8 9]) maps one signals to all of one group of
> 	pins, chosen from a list of groups.
>
> So () means "use one of" and [] means "use all of"
>
>
Thanks for the very clear explanation.

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