CXL switch Verification IP
Ports around a CXL switch: virtual hierarchies, multi-logical devices, fabric routing and the fabric manager API.
CXL switch verification IP
A CXL switch connects several hosts and devices, so memory and accelerators can be pooled and shared. A fabric manager configures which device belongs to which host.
Lumina VIP for CXL switch covers CXL 2.0 · 3.x, as published by CXL Consortium. It comes as verification IP, built for Lumina, so the same components run in simulation and report their results in one place.
What the CXL switch VIP covers.
Switching
- Virtual CXL switches and virtual hierarchies per host
- Binding and unbinding of multi-logical device slices
- Fabric manager API commands
- Port-based routing in CXL 3 fabrics
Scenarios and options
- Hot-add and hot-remove of devices behind the switch
- Traffic from several hosts to shared memory devices
What it checks
- Link training and the state machines of every layer
- Transaction ordering, flow control credits and replay
- Configuration space, capabilities and error reporting
- Power states and speed and width changes
Verification IP capabilities
- Active and passive agents for every protocol role, set per instance
- Bus widths, timing and optional features set by parameters, and changeable while a test runs
- A sequence library from basic directed traffic to constrained-random stress
- Error injection, static or on the fly, with checks that the expected error was seen
- Protocol checks that run in real time, each tied to a rule of the specification
- Scoreboards that check data end to end
- Throughput, latency and utilisation statistics for each interface
- Callbacks at each stage for your own checks and stimulus
- UVM register model adapters for protocols that carry register access
- Transaction logs and messages linked to the waveform for debug
Why Lumina VIP.
- Fast CXL switch testbench bring-up: connect the agents, pick a test and run
- Every failure names the rule it broke and the transaction that broke it
- Protocol coverage merges with your design coverage in one database
- Readable SystemVerilog and UVM source your team can extend
- Runs natively in Lumina Sim, with no wrappers and no separate compile
- Results structured for engineers and AI agents alike
Verification components.
Each component works on its own or together with the others in one environment, in active or passive mode.
- 01Host models per upstream port
- 02Device models per downstream port
- 03Fabric manager model
CXL switch products.
CXL switch verification IP
UVM agents that drive and check a protocol in simulation, in every role the protocol defines.
Includes
- Active and passive UVM agents for each protocol role
- Configurable sequences, from directed to constrained-random
- Protocol checks that flag violations with a spec reference
- Functional coverage of the protocol's features
- Scoreboards and transaction logs readable by people and AI agents
Test suite and coverage.
- Directed tests for each feature of the specification
- Constrained-random tests across configurations and traffic mixes
- Error-injection tests that check how the design recovers
- A functional coverage model mapped to the specification
- Regression lists ready to run in Lumina
Test focus for this protocol family
- Link training at every rate and width
- Flow-control credit exhaustion and replay
- Malformed TLPs, LCRC and ECRC errors
- Power-state entry and exit under traffic
What you receive.
- Readable source of every component
- The test suite and its coverage model
- An example environment connected to a sample design
- User guide, integration guide and release notes
- Scripts to run the examples in Lumina
Where it is used.
- Data-centre accelerators and SmartNICs
- SSD and storage controllers
- Chiplets and multi-die packages
Frequently asked questions.
What is Lumina VIP for CXL switch?
Lumina VIP for CXL switch is a set of verification products for designs that use CXL switch: verification IP. Ports around a CXL switch: virtual hierarchies, multi-logical devices, fabric routing and the fabric manager API.
Which CXL switch versions does it support?
CXL 2.0 · 3.x, as published by CXL Consortium. If you need another version or option, tell us which one.
Which verification components are included?
Host models per upstream port, Device models per downstream port and Fabric manager model. Each one can be used on its own or together with the others in one environment.
What language and methodology does it use?
The verification IP and models are written in SystemVerilog with UVM, as readable source your team can extend.
How does it work with Lumina?
It runs in Lumina Sim beside your RTL. Protocol coverage merges into the same database as your own coverage, and every violation names the rule it broke and the transaction that broke it.
Which tests come with it?
Directed tests for each feature of the specification. Constrained-random tests across configurations and traffic mixes. Error-injection tests that check how the design recovers. A functional coverage model mapped to the specification. Regression lists ready to run in Lumina. For this protocol family the tests focus on: link training at every rate and width, flow-control credit exhaustion and replay, malformed TLPs, LCRC and ECRC errors and power-state entry and exit under traffic.
What is delivered?
Readable source of every component. The test suite and its coverage model. An example environment connected to a sample design. User guide, integration guide and release notes. Scripts to run the examples in Lumina.
How can I get Lumina VIP for CXL switch?
Lumina VIP for CXL switch is in preview. Email hello@lumeeslab.com with the versions and product types you need.
Need VIP for a protocol?
Tell us which protocols and versions you need. We also add protocols on request.
Lumina VIP
hello@lumeeslab.comHelpful to include
- The protocols and versions
- Product types: VIP, assertion IP, memory model, transactor
- Your schedule