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DescriptionQ141
Q141DVASIC interview problem

Bias burst lengths by range

TechniquesRandomizationdistProbability
DifficultyEasy
TopicConstraints
LanguageSystemVerilog
Requirements3 checkpoints
01

Problem

Randomize a burst length from 1 through 16 so lengths 1-4 collectively occur 70% of the time and lengths 5-16 collectively occur 30%.

Example input and output

Use this case to check your interpretation
Input
randomize burst_len in 1..16 with [1:4] :/ 70 and [5:16] :/ 30
Output
One legal randomized result: burst_len=4
Explanation

The :/ operator distributes each bucket's total weight across its members. A draw of 4 is legal; repeated trials approach the intended 70/30 bucket split, but one solve is non-unique.

02

Requirements (3)

  • Every value from 1 through 16 must remain legal.
  • Apply weights to each range as a whole.
  • Do not accidentally give every member of a range the full range weight.