ID: SV-LSU

Description

Role summary
Own verification of the Load/Store Unit, data cache and bus interfaces for a CPU/GPU core — the block handling memory ordering, address generation, cache/TLB interaction, forwarding, and exception handling. Contribute to drive the LSU from RTL freeze to tapeout-quality sign-off.

Responsibilities

- Define and own the LSU verification plan: functional coverage, testplan, checkers, and closure criteria
- Build/extend UVM testbench components for LSU (drivers, monitors, scoreboards, memory models)
- Develop directed and constrained-random tests covering store-to-load forwarding, memory ordering (RISC-V WMO model), speculative loads, vector accesses, misaligned/split accesses, exceptions/faults, and pipeline hazards
- Drive formal verification for ordering/coherence properties where simulation coverage is weak
- Debug RTL/testbench failures in collaboration with design; triage and root-cause
Track and close functional/code coverage; report verification status to program
- s
Mentor
- verification engineers; review testbench code and testplans
Interface with architecture, design, and DV
- s on other units to resolve cross-unit issues.

Why Seynamics?

- Work at one of Europe's most promising deep-tech semiconductor scale-ups.
- Accelerated development path.
- 4 days per week in the Barcelona office (city center), 1 WFH day.
- 1 week of work from everywhere in the world.
- Competitive package.
- A collaborative, technical,



and growth-oriented environment that values direct ownership and clear thinking.

Requirements

Required qualifications

- BS/MS in EE/CE/CS, 5+ years in ASIC functional verification.
- Strong SystemVerilog/UVM experience; hands-on testbench architecture
- Deep understanding of memory subsystems: cache hierarchies, TLBs, memory consistency models, load/store pipelines
- Knowledge of RISC-V ISA and privileged specification is mandatory
- Knowledge of AMBA AXI4, AXI5Lite and CHI is mandatory
- Experience with coverage-driven verification and regression management
- Debugging complex RTL failures using waveform tools (Verdi/DVE or similar)

Preferred

- Formal verification experience (JasperGold or similar) applied to memory ordering/coherence
- Knowledge of CPU architecture and memory execution pipeline
- Prior LSU, cache, or memory-controller verification specifically
- Experience with RISC-V, ARM, or x86 memory models
- Scripting (Python/Perl) for verification infrastructure and regression automation
Prior team
- or mentorship experience

Nice to Have

- Emulation platforms (Veloce, ZeBu)
- Familiarity with fuzzing techniques (AFL++)
- Knowledge of SystemC/C++ testbenches

Essential Soft Skills

- An adversarial, gap-seeking mindset — instinctively asks "who actually checks this?" — collaborative relationship with the whole core.
- Clear communication across DV, design, and software teams; writes verification plans others can follow.

SENIOR

📌 Senior Verification — LSU (Load/Store Unit) and Data Cache (Barcelona)
🏢 Semidynamics
📍 Barcelona