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DescriptionQ194
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Q194DVASIC interview problem

Fixed-Priority Arbiter Picks the Wrong Requester

TechniquesDVWaveform DebuggingArbitration
DifficultyEasy
TopicWaveform Debugging
LanguageSystemVerilog
Format4 choices
01

Problem

A two-requester arbiter uses fixed priority. Requester 0 has higher priority than requester 1. Grants are combinational values sampled at each edge. Rule to apply: If req0 is 1, grant0 must be 1 and grant1 must be 0. grant1 may be 1 only when req1=1 and req0=0. What is the root cause of the arbitration error at C3?

Waveform for Fixed-Priority Arbiter Picks the Wrong Requester. Signals: req0, req1, grant0, grant1. Numbered markers identify sampled columns.
Read the sampled columns from left to right, then test each choice against the stated timing rule.
02

Answer choices (4)