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DescriptionQ985
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Q985FWASIC interview problem

Build parameterized pack and unpack helpers

TechniquesParameterized classPacked vectorData layout
DifficultyMedium
TopicBit Manipulation
LanguageSystemVerilog
Requirements3 checkpoints
01

Problem

Create reusable helpers that pack N words of W bits into one vector and unpack that vector with word 0 in the least-significant lane.

Example input and output

Use this case to check your interpretation
Input
N=3, W=4, words[0:2] = [4'hA, 4'h3, 4'hF]
Output
packed = 12'hF3A; unpack(packed) = [A, 3, F]
Explanation

Word zero occupies the least-significant nibble, so the same indexed part-select convention makes pack and unpack exact inverses.

02

Requirements (3)

  • Support compile-time N and W parameters.
  • Use one explicit indexed part-select mapping in both directions.
  • Initialize the packed result before assigning slices.