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USB4 v2.0 NVMe Bridge Controller Research
Scope
Research target: a PCB that connects M.2 NVMe SSDs to a computer over USB4 v2.0 / 80 Gbps class USB-C.
Key Findings
1. Practical 80 Gbps controller option: Intel JHL9480 / JHL9480B2
Public product and enclosure evidence points to Intel JHL9480, code name Barlow Ridge, as the dominant current controller for 80 Gbps Thunderbolt 5 / USB4 v2 external NVMe SSD enclosures.
Public Intel specs identify JHL9480 as:
- Product: Intel JHL9480 Thunderbolt 5 Accessory Controller
- Code name: Barlow Ridge
- Launch: Q3 2024
- Port configuration: Quad
- PCIe: x4 Gen 4
- DisplayPort: DP 2.1 tunnel / re-drive capabilities
- Package: FC-CSP per Intel PCN and distributor listings
B2 stepping is publicly listed by Intel ordering/compliance pages:
- SRPNM — Tray, B2
- SRPNN — Tape & Reel, B2
2. Existing products using JHL9480
Several current 80 Gbps external NVMe products explicitly advertise JHL9480/JHL9480B2:
Table
| Vendor / Product | Interface | Controller Evidence | Notes |
|---|---|---|---|
| ACASIS TB501 / TB501Pro | TB5 / USB4 v2 80 Gbps | JHL9480(B2), sometimes JHL9480 + RTL9210 | NVMe enclosure, up to ~6000 MB/s class |
| UGREEN 80Gbps M.2 NVMe Enclosure | TB5 / USB4 | JHL9480 | Up to 8 TB, M.2 NVMe 2280 |
| WAVLINK RapidFire-T5 | USB4 v2 / TB5 | JHL9480 powered | PCIe Gen4 NVMe enclosure |
| TESmart TBE-X5Max | TB5 / USB4 v2 | JHL9480 B2, sometimes ASM2364 for legacy fallback | Dual-path style design |
| ORICO X50/X50 Pro | TB5 | JHL9480 | Review sources report ~6000 MB/s class |
3. Public datasheet / pinout status
A full electrical datasheet, pinout/ball map, schematic checklist, power sequencing guide, strap definitions, firmware details, and layout checklist were not found publicly.
Intel public pages provide high-level specs only. Intel community responses direct detailed JHL9480 design questions to the Thunderbolt Developer Portal, implying the real design collateral is gated behind Intel/Thunderbolt developer access and likely CNDA/NDA.
4. Flux library availability
Flux library searches found no usable Intel JHL9480/JHL9480B2 part and no functionally equivalent USB4 v2 80 Gbps NVMe bridge controller.
Searches performed:
JHL9480JHL9480B2Intel JHL9480 Barlow Ridge Thunderbolt 5 USB4 v2 80Gbps device controller for NVMe SSD enclosure PCIe bridge- Generic USB4 v2 / 80 Gbps NVMe bridge controller queries
Result: no exact or viable part available in Flux at this time. A missing-part request was submitted for Intel JHL9480/JHL9480B2.
5. ASMedia / alternative controller status
- ASM2464PD / ASM2464PDX: USB4 / Thunderbolt-to-PCIe NVMe bridge, but public evidence points to 40 Gbps-class USB4/TB4, not USB4 v2 80 Gbps.
- ASM2364: USB 3.2 Gen2x2 20 Gbps to PCIe/NVMe bridge, not USB4 v2. Sometimes used as a legacy fallback path in 80 Gbps enclosures.
- Silicon Motion SM2324: USB4 portable SSD controller, but appears aimed at native NAND-based portable SSDs rather than off-the-shelf M.2 NVMe bridge designs.
- ASMedia ASM4242: USB4 host controller, not a device-side NVMe enclosure bridge.
Feasibility Assessment
Can we design a true USB4 v2.0 80 Gbps NVMe adapter schematic now?
Not reliably from public data alone. The missing JHL9480 pinout and design collateral block a correct schematic. For a high-speed USB4/TB5 controller, guessing pins, rails, straps, firmware interfaces, or reference topology would be unsafe and likely nonfunctional.
Practical paths forward
-
Preferred professional path
- Obtain Intel/Thunderbolt Developer Portal access.
- Get the JHL9480 datasheet, reference schematic, layout checklist, firmware/configuration docs, and certification requirements.
- Import/create the JHL9480 component in Flux from the official pinout.
- Build the schematic from Intel’s reference design.
-
Prototype/learning path
- Use a ready-made JHL9480 enclosure module/board and design a carrier/mechanical/power/accessory board around it.
- This avoids creating the JHL9480 high-speed design from scratch.
-
Lower-risk custom PCB path
- Target USB4 40 Gbps using ASMedia ASM2464PD/ASM2464PDX-class architecture if datasheet/reference design access is obtainable.
- Still advanced, but more mature in existing USB4 NVMe enclosures than USB4 v2 80 Gbps.
-
Fallback hobbyist path
- Use USB 3.2 Gen2x2 20 Gbps NVMe bridge architecture with ASM2364-class controller.
- Much more feasible for custom design, but not USB4 v2 / 80 Gbps.
Recommendation
Do not start a guessed JHL9480 schematic until the official Intel/Thunderbolt design collateral is available. If the goal is a manufacturable product, pursue JHL9480 via Intel developer access. If the goal is a hobbyist PCB that can actually be built without NDA materials, step down to a documented USB 3.2 Gen2x2 or accessible USB4 40 Gbps controller path.
Scope
Key Findings
1. Practical 80 Gbps controller option: Intel JHL9480 / JHL9480B2
2. Existing products using JHL9480
3. Public datasheet / pinout status
4. Flux library availability
5. ASMedia / alternative controller status
Feasibility Assessment
Can we design a true USB4 v2.0 80 Gbps NVMe adapter schematic now?
Practical paths forward
Recommendation
