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Showing results for tags 'dist'.
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Can a distribution value_range be a list? Or is there way to achieve the same result using "dist"? As shown by non-working example code, I try to do something like this: bit [1:0] twobits; assert(std::randomize(twobits) with {twobits dist {2'b10:=50, inside{2'b00,2'b11,2'b01;}:/50};} ); //INCORRECT assert(std::randomize(twobits) with {twobits dist {2'b10:=50, [2'b00,2'b11,2'b01]:/50};} ); //INCORRECT "18.5.4 Distribution" image snippet from IEEE_Std1800-2017 LRM attached. Is there (isn't there) a way that value_range can be a list of choices, which are not in a range? For example 00, 11, 01. I thought I had done this in the past, but now, a few years out of the SV game, I can't seem to get it to work. I can think of other ways to (Maybe an array holding the values, or something like that? Perhaps I simply imagine that I ever did this using a dist.)
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*, How can I randomize with a dist and specify a weight for values not being inside a range? class randclass; rand logic [3:0] randvalue; function void post_randomize(); $display("value: %0d",randvalue); endfunction constraint inside_practice { randvalue dist { [3:4] :/ 50, !(inside {[3:4]}) :/ 50 //<--- I try to have a sort of 'others' category here }; } endclass module top; randclass randclass; initial begin randclass = new(); repeat (10) begin randclass.randomize(); end $finish(); end endmodule Reference: https://www.edaplayground.com/x/cV5 shaking off the rust after a SystemVerilog hiatus, thanks
