How to Perform CXL 1.1 and 2.0 Protocol Validation

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PCIe Protocol Analyzer
+ PCIe Protocol Analyzer
PCIe Protocol Analyzer
+ PCIe Protocol Analyzer

Ensure Reliable CXL Link Bring-Up and Coherency Behavior

Compute Express Link (CXL) 1.1 and 2.0 extend the PCI Express (PCIe) physical layer to support low-latency, cache-coherent communication between hosts, accelerators, and memory devices. These early CXL implementations introduce CXL.io, CXL.cache, and CXL.mem protocols over point-to-point and switched topologies, supporting memory expansion, accelerator attach, and resource sharing in heterogeneous computing systems while maintaining software compatibility with PCIe.

Validation of CXL 1.1 and 2.0 devices requires exercising link initialization, LTSSM transitions, protocol negotiation, and coherency flows between hosts and endpoints. Engineers must observe and correlate packet exchanges across PCIe and CXL protocol layers to verify ordering rules, timing relationships, and correct behavior during bring-up and normal operation. Time-aligned, multi-layer visibility with detailed decoding is essential to identify protocol violations, interoperability issues, and coherency failures against the CXL 1.1 and 2.0 specifications.

CXL 1.1 and 2.0 Protocol Validation Solution

Validating CXL 1.1 and 2.0 protocol compliance requires capturing and analyzing protocol traffic to confirm correct link initialization, protocol negotiation, and coherency behavior between hosts and devices. The Keysight CXL 1.1 and 2.0 protocol validation solution combines high-fidelity protocol capture with deep analysis to monitor LTSSM transitions, decode CXL.io, CXL.cache, and CXL.mem transactions, and correlate events across PCIe and CXL protocol layers. With time-aligned visibility into protocol behavior and detailed packet-level decoding, engineers can identify protocol violations, timing mismatches, and interoperability issues, accelerating debug and validation workflows for CXL-based systems.
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