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DescriptionQ042
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Q042DVASIC interview problem

Acknowledge Without an Outstanding Request

TechniquesDVWaveform Debugging
DifficultyEasy
TopicWaveform Debugging
LanguageSystemVerilog
Format4 choices
01

Problem

Only one request may be outstanding. A request becomes outstanding when req is sampled high and is cleared when ack is sampled high. The outstanding row shows the state immediately after each edge. Rule to apply: ack may be 1 only if a request is already outstanding or req is 1 at the same edge. Which assertion fails at C5?

Waveform for Acknowledge Without an Outstanding Request. Signals: req, ack, outstanding. 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)