inverting multi dimension array in sv

ravivlsi · Junior Joined: Jul 22, 2010 Posts: 5

I have two dimensional arrays a and b
reg [7:0] a[0:99];
reg [7:0] b[0:99];

and I want to invert entire array by using
b = ~a;

but I got compilation error "bit wise negation, operator operand type is illegal"

Is it possible to invert entire multi dimension array without using loops?

dave_59 · Posted: Tue Apr 17, 2012 1:39 am **Post subject:**

You can't use bit-wise operators on an unpacked array. If you declared your array as

reg [0:99][7:0] a;
reg [0:99][7:0] b;

Then your statement would work.

You could also cast your array to a packed array value, invert it, then cast it back to an unpacked array

b = unpacked_type'(~ packed_type'(a));

But why not a foreach loop.

foreach(b[i]) b[i] = ~a[i];

Dave Rich
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