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DescriptionQ1069
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Q1069DVASIC interview problem

Schedule configurable slave responses

TechniquesUVMResponderLatencyOrdering
DifficultyHard
TopicUVM Components
LanguageSystemVerilog
Requirements4 checkpoints
01

Problem

Build the policy core of a reactive responder that queues observed requests and emits responses with configurable latency, error injection, and global, per-ID, or out-of-order scheduling.

Example input and output

Use this case to check your interpretation
Input
request A arrives first due at cycle5; request B arrives second due at cycle3; schedule at cycle3
Output
global mode selects none; per-ID or out-of-order mode may select B with B's matching response ID
Explanation

Global policy cannot bypass its not-yet-due oldest request, while the other policies may choose a due head without moving drive semantics into the monitor.

02

Requirements (4)

  • Keep the request monitor passive and place response decisions in a replaceable policy object.
  • Global mode may select only the oldest request; per-ID mode may select only the head request for each ID.
  • Out-of-order mode may choose any due request while preserving response ID matching.
  • Drive the chosen response with stable ready/valid semantics in a separate responder driver.