Coherent Mesh Network (CMN)

Concept

A Coherent Mesh Network (CMN) is an on-chip interconnect fabric that provides hardware-coherent access to shared memory and caches among multiple cores and agents in a system-on-chip. Within RISC-V and Arm verification contexts, CMN programming and configuration are a recognized source of bugs that SoC integrity verification must catch, alongside coherency stress, cache-coherence protocols, and memory-ordering tests.

First seen 7/6/2026

Last seen 7/6/2026

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Coherent Mesh Network (CMN)

Definition

A Coherent Mesh Network (CMN) is the on-die interconnect used in modern system-on-chip (SoC) designs to connect processor cores, caches, and other agents while maintaining hardware-level memory coherence. It is the substrate over which cache-coherence protocols (such as MOESI) operate, allowing multiple cores to share data with coherent reads and writes across distributed caches.

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SoC Integrity Verification ← mentions 88% 1e

Coherent Mesh Network programming issues were found during SoC integrity verification.

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SoC Integrity Verification MENTIONS Extracted graph relationship

CITATIONS

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[1] CMN programming issues are a class of bug discovered by SoC integrity verification in real designs. RISC-V Core & SoC Verification (Verification Futures Reading 2024)

[2] Misconfigured ARM CMN pins intended to enable coherent traffic have been observed as bugs in real designs. RISC-V Core & SoC Verification (Verification Futures Reading 2024)

[3] Common-cache-line access patterns have revealed deadlock conditions tied to coherent traffic across the mesh. RISC-V Core & SoC Verification (Verification Futures Reading 2024)

[4] Automated coherency tests on the CMN find bugs that directed coherency coverage misses, as shown by coverage comparison figures in the presentation. RISC-V Core & SoC Verification (Verification Futures Reading 2024)