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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