AI/ML Networking and I/O

Install and activate OSS CAD Suite and execute a provided SymbiYosys safety proof.

Contrast formal exploration of reachable states with constrained-random simulation in UVM.

Classify DMA verification statements as assumptions, assertions, or cover properties.

Write reset-aware clocked properties using the SystemVerilog subset supported by the open-source flow.

Express valid-ready transfer and stability rules with temporal operators and sampled-value functions.

Run bounded model checking and induction, then distinguish pass, fail, and inconclusive results.

Trace a failed property to its earliest causal event in a counterexample waveform.

Detect vacuous proofs by adding and evaluating reachability cover properties.

Specify memory-to-stream and stream-to-memory transfer behavior shared by PCIe and Ethernet modes.

Define the fields, ownership states, and lifecycle of a scatter-gather DMA descriptor.

Specify legal configuration, quiesce, reset, and PCIe-versus-Ethernet mode transitions.

Partition the design into protocol adapters, queue management, data movement, and completion blocks.

Define normalized command and completion contracts between each protocol adapter and the shared DMA core.

Assign queue, channel, and ordering domains for concurrent DMA traffic.

State the principal safety and progress invariants for the configurable DMA architecture.

Derive AXI4 and AXI-Stream handshake requirements for each shared DMA datapath boundary.

Design a descriptor-fetch control machine that tolerates AXI4 latency and backpressure.

Design ring-pointer and credit logic that prevents descriptor queue overflow and underflow.

Design a burst-splitting unit for alignment, maximum-length, and 4-KiB boundary constraints.

Design a memory-to-stream datapath that generates correct byte qualifiers and packet boundaries.

Design a stream-to-memory datapath that handles partial final beats without overwriting invalid bytes.

Size elastic buffers from latency and backpressure requirements.

Design a queue scheduler with a stated arbitration and starvation policy.

Map PCIe memory-read, memory-write, and completion transactions onto the shared DMA command model.

Design PCIe tag allocation and completion reassembly for multiple outstanding reads.

Enforce PCIe ordering, request-size, payload-size, and boundary constraints at the adapter.

Map Ethernet transmit and receive frame metadata onto the shared descriptor model.

Design Ethernet buffer ownership, refill, and completion behavior for transmit and receive queues.

Preserve AXI-Stream packet boundaries and byte qualifiers through Ethernet-side stalls.

Isolate the inactive protocol adapter so that it cannot alter shared DMA state.

Define assume-guarantee contracts for each adapter at the shared-core boundary.

Organize interface checkers, block harnesses, and an end-to-end harness without binding properties to one formal vendor.

Constrain an AXI4 environment without assuming away legal latency, backpressure, or response behavior.

Constrain AXI-Stream sources and sinks while separating safety assumptions from fairness assumptions.

Build an abstract memory model that preserves address, byte-enable, and read-after-write behavior relevant to DMA.

Represent arbitrary descriptors and payloads with symbolic values suitable for exhaustive analysis.

Construct a ghost scoreboard for tracking accepted, pending, and completed DMA data.

Write assume-guarantee contracts that permit independent proofs of adapters, queues, and data movers.

Create a requirements-to-properties matrix covering control, data integrity, ordering, errors, and progress.

Prove that queue pointers and occupancy remain within their legal ranges.

Prove that each accepted descriptor is consumed and completed at most once.

Prove that rejected address or length combinations cannot initiate an AXI4 payload transfer.

Prove end-to-end absence of payload loss, duplication, and corruption for an abstract transfer.

Prove preservation of per-queue ordering while permitting documented inter-queue reordering.

Prove that output payload and metadata remain stable throughout backpressure.

Prove reset, quiesce, and mode-switch behavior cannot strand or misattribute a transfer.

Prove eventual transfer progress under explicitly stated downstream fairness assumptions.

Reduce proof complexity with parameter bounds and symbolic payload abstraction without removing the behavior under test.

Introduce cut points and strengthening invariants when an induction proof does not converge.

Diagnose false failures caused by missing assumptions, overconstraint, or an incorrect abstraction.

Measure formal reachability with cover properties for queue, burst, stall, error, and concurrent-traffic scenarios.

Run separate PCIe-mode and Ethernet-mode proof configurations against the shared RTL.

Draw the final block diagram with clock, reset, control, descriptor, data, and completion boundaries.

Document each formal target with its properties, assumptions, abstractions, proof engine, and completion criteria.

Report proven guarantees, bounded results, unreachable scenarios, and residual verification risks for the DMA design.