FIFO
ConceptIn the provided processor-verification evidence, a FIFO is a hardware queue module whose full and ready signals are important backpressure points. Congestor logic fuzzers can be inserted at these signals to create artificial backpressure, exposing bugs in cache arbitration and frontend/backend command handling.
First seen 5/28/2026
Last seen 5/28/2026
Evidence 4 chunks
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Overview
In the provided evidence, FIFO structures appear as hardware queues inside processor RTL. They are discussed primarily as verification targets because their full and ready signals can be perturbed to create artificial backpressure.
FIFO signals as fuzzing targets
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1 connectionsCongestors are applied to FIFO full/ready signals to create artificial backpressure.
LINKED ENTITIES
1 linksCITATIONS
4 sources4 citations — click to collapse
[1] A congestor can be inserted at a FIFO full signal, randomly activating the signal to create artificial backpressure; congestors may also target busy and ready-valid handshake signals. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...
[2] In the cache subsystem example, a FIFO queued instruction-cache memory requests, and artificial backpressure at its full signal could lead to an arbiter grant stuck at 0 and a complete system hang. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...
[3] BlackParrot contains a FIFO queue between the frontend and backend for commands such as PC redirect and state reset. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...
[4] Pulling the BlackParrot frontend/backend FIFO ready signal low with a congestor exposed a mismatch where instructions committed with the wrong PC; the cited explanation was that backend commands could be lost because the backend could not handle backpressure and had no stalling points past decode. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...