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DescriptionQ527
Q527DVASIC interview problem

Constrain exactly K set bits

TechniquesRandomization$countonesBit mask
DifficultyEasy
TopicConstraints
LanguageSystemVerilog
Requirements3 checkpoints
01

Problem

Use $countones to randomize a W-bit mask containing exactly K set bits.

Example input and output

Use this case to check your interpretation
Input
W=8, K=3
Output
One valid randomized result: mask=8'b0010_1010
Explanation

The result contains exactly three one-bits; any other 8-bit value with popcount three is equally valid unless additional weights apply.

02

Requirements (3)

  • Keep W and K compile-time configurable.
  • Use a two-state randomized mask.
  • Treat K outside 0 through W as an unsatisfiable configuration.