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DescriptionQ014
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Q014DVASIC interview problem

Read Attempt on an Empty FIFO

TechniquesDVWaveform DebuggingFIFO
DifficultyEasy
TopicWaveform Debugging
LanguageSystemVerilog
Format4 choices
01

Problem

At each edge, pop and empty are sampled before the operation. occupancy is the number of stored entries immediately after the edge. Rule to apply: A pop is legal only when empty is 0. A pop while empty is 1 is an underflow attempt. What causes the error at C3?

Waveform for Read Attempt on an Empty FIFO. Signals: push, pop, empty, occupancy. 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)