Write a constraint where you have a 32 bit value bit [31:0] val where you’d want to randomize this to where every randomization would only allow 2 bits to differ from the previous randomization. Can we solve it by using $countones(prev_val^cur_val) == 2) This is so because if only two bits are d…

Constraint Interview Question

dave_59 January 7, 2024, 10:09pm 6

Hi , I was trying to understand working of const’() cast. LRM 6.24.1 mentions An expression may be changed to a constant with a const cast. const'(x) Consider the following code : class C; rand bit[2:0] a ; function void pre_randomize(); // 'a' could be assigned here endfunction constraint CONST { a == const'(a) + 1 ; } function void post_randomize(); // 'a' could be assigned here endfunction endclass C c1; module test; initial begin c1 = new(); r…

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