RTL and microarchitecture

The engineering objective

Translate interface and performance requirements into synthesizable logic, register behaviour and a reviewable microarchitecture.

The work starts from interface specification, register map, clocks, reset sequence and throughput targets. The team should identify the authoritative revision of each input and record any assumptions needed to proceed. This prevents a later result from being interpreted against a different specification or configuration.

What needs technical attention

Avoid treating successful synthesis as functional verification; arithmetic width, signedness and protocol stalls need explicit checks.

The review centres on lint findings, interface corner cases, reset recovery and requirements-based simulation. Each finding should identify the input revision, observed behaviour and supporting evidence. Distinguish a confirmed defect from a configuration issue, an unsupported case or an open engineering question before deciding how to resolve it.

How the work is reviewed

The practical sequence is: partition datapaths and control; specify buffering and backpressure; implement parameterised RTL and assertions; review reset and clock-domain behaviour. Intermediate reviews allow the client to resolve decisions while changes are still manageable. If an input changes, identify the affected activities and repeat the checks that depend on it.

The expected package comprises RTL sources, architecture notes, register descriptions, constraint assumptions and a verification handoff. Acceptance criteria should specify what the receiving team needs to reproduce, inspect or integrate these artifacts. Include known limitations and outstanding actions in that package, rather than assuming that delivery of a file implies acceptance.

Make the interface contract executable

A specification becomes useful when the team can distinguish legal behaviour from a defect at each interface. Record which side drives a transaction, when data becomes valid, how backpressure works and what happens if reset arrives during a transfer. Register descriptions should state access permissions, reset values and side effects. Configuration parameters need a supported range; a design verified in one configuration should not automatically be treated as verified in every configuration.

Performance requirements need a workload and an observation point. Specify whether a latency target measures an isolated transaction or a stream under contention. State how throughput is counted when requests stall, retry or cross clock boundaries. This makes architecture reviews more productive: a buffer, pipeline stage or arbitration change can be compared against an explicit requirement rather than a headline frequency.

Keep functional verification, structural checks and implementation feasibility as distinct review activities. A successful compile, proof or synthesis run answers the question posed by its setup; it does not establish that the setup covered the entire product requirement. Review assumptions, exclusions and unsupported modes alongside the result. Where an interface is supplied by another team, agree a small integration test and its expected response before connecting the full subsystem.

An illustrative review scenario

Consider a producer that can issue consecutive requests while its consumer occasionally stalls. Review whether the interface preserves ordering, holds data stable and resumes without losing a request. Add a reset during the stall and a boundary-length transfer. Record the expected behaviour first, then retain the test and result with the design revision. This is an illustrative review scenario, not a claim about a delivered client project.