Semidynamcis is seeking a Senior LPDDR5X Controller/PHY First-Silicon Bring-Up Engineer to support reconstruction, implementation and physical qualification of the LPDDR5X Controller/PHY initialization and training flow, taking controlled verification collateral through to deterministic first-silicon execution and failure diagnosis.

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Required experience

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- Demonstrable DDR/LPDDR post-silicon bring-up experience; LPDDR5/LPDDR5X experience is strongly preferred.

- Strong understanding of memory-controller and PHY initialization, DRAM mode registers, timing configuration and frequency operating points.

- Hands-on experience with PHY initialization firmware, mailbox/status flows, calibration and training procedures.

- Experience diagnosing training failures and separating controller, PHY, DRAM, clock, reset and board-level causes.

- Low-level C/C++ firmware development and direct MMIO/register access.

- Ability to translate ordered verification sequences into deterministic executable firmware with readback, polling and bounded timeout handling.

- Understanding of memory read/write sanity testing and the transition from training PASS to a usable memory configuration.

- Practical laboratory experience during physical first-silicon memory bring-up.

Strongly preferred

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- Direct experience with Cadence DDR/LPDDR Controller and PHY IP.





- Experience with Cadence PHY firmware/training flows or comparable commercial DDR PHY solutions.

- LPDDR5X frequency switching, training checkpoints and known-good configuration capture.

- Experience with first CPU-visible bandwidth measurements and controlled memory-performance evidence.

- Experience correlating verification traces, register databases and physical-silicon results.

Expected responsibilities

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- Review existing DDR verification collateral and identify the authoritative initialization/training sequence.

- Help convert the sequence into maintainable low-level C/C++ code rather than a blind register replay.

- Define register access widths, masks, polling conditions and hardware-derived timeouts from authoritative specifications.

- Integrate PHY firmware loading and controlled training/status flows.

- Support first-silicon initialization, training, basic read/write and failure isolation.

- Capture a controlled known-good configuration and reproducible evidence.

- Support the transition to the first controlled CPU-visible read/write/copy bandwidth measurement

Why Semidynamics?

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- Work for 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 day WFH.

- 1 week of work from everywhere in the world.

- Competitive package. xghoner

- A collaborative, technical, and growth-oriented environment that values direct ownership and clear thinking.

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📌 Senior LPX Controller/PHY First-Silicon Bring-Up Engineer (Barcelona)
🏢 Semidynamics
📍 Barcelona