FSRTS FUSA RTS CORTEX-M7 NO MPU PERP Verification and Procurement Checklist
The FSRTS FUSA RTS CORTEX-M7 NO MPU PERP is an ARM license for a Functional Safety (FuSa) Run-Time System (RTS) targeting a single project on Cortex-M7 processors without Memory Protection Unit (MPU) support, classified under Software, Services as a perpetual single-project entitlement.
Physical and Marking Inspection for FuSa Software Licensing Media
Unlike physical semiconductors, this software license product is delivered as an entitlement key, often via a USB dongle or a license file. Counterfeit or mislabeled licenses in this category typically involve reused dongles, expired subscriptions sold as perpetual, or mismatched project scopes. Verify the packaging seal and the holographic sticker on the license card. Laser-etched part numbers on ARM dongles appear as shallow, grey, non-removable marks; ink-based markings are unusual for genuine ARM software media. Check the date code format: ARM uses YYWW (year and work week) on labels, e.g., 2345 for week 45 of 2023. If the label shows a year prior to the product's introduction (Cortex-M7 FuSa RTS was introduced in 2022), reject the shipment as suspect.
Instrument-Based Parameter Verification for License Entitlement
Applying a multimeter is irrelevant here. Verification requires the ARM License Manager tool (LM_LICENSE_FILE or ARM License Wizard). Connect the USB dongle or load the license file. The tool must report:
- Feature: FSRTS_FUSA_RTS_CORTEX-M7_NO_MPU_PERP
- Type: Perpetual (no expiry date field, or a fixed date far in the future, e.g., 2035)
- Scope: Single project (should display "project_count=1")
Pass criteria: No "DEMO", "MAINTENANCE", or "SUBSCRIPTION" flags. For dongles, the physical USB enumeration must report ARM Embedded as the vendor string. Fail if the device manager shows "Generic License Dongle" – this indicates a cloned or third-party device.
X-Ray and Decap Analysis for High-Value Deployment Verification
For projects requiring ISO 26262 or IEC 61508 certification, the license authenticity must be physically verifiable. Genuine ARM USB dongles (Sentinel HL or similar) contain a tamper-resistant security chip with an epoxy-encapsulated die, not a standard flash memory IC. X-ray imaging should reveal a single large die with exposed bonding wires; the presence of two separate dice (a common counterfeit technique using a generic MCU + external flash) is grounds for rejection. Decap analysis is destructive but definitive: authentic ARM dongles use a custom ARM security core with visible metal layers and laser-etched ARM logos on the die. Any die that shows generic markings (e.g., "STM32" or "Cypress") indicates a refurbished or repurposed dongle.
Packaging, COA Cross-Check, and Documentation Requirements
The Certificate of Authenticity (COA) for the FSRTS FUSA RTS CORTEX-M7 NO MPU PERP must include a unique license key in the format ARM-FUSA-XXXX-XXXX-XXXX. Cross-check this key against ARM's entitlement portal (support.arm.com). If the portal returns "Already activated" or "Invalid", the unit is reused. The packaging should contain a printed license agreement booklet with ARM's security hologram (shifting colors from gold to green under 45-degree tilt). Accept only if the COA serial matches the box label and the dongle sticker. Reject if any mismatch exists.
AQL Sampling Plan and Accept/Reject Criteria for Receiving Inspection
| Parameter | Value | Engineering Meaning |
|---|---|---|
| License Type | Perpetual Single Project | This parameter indicates no annual renewal fees apply. Typical range: Perpetual vs. Subscription. Values above this level usually indicate subscription-based pricing. |
| Target Core | Cortex-M7 (No MPU) | Licensed RTS is compiled for M7 cores without hardware memory protection. Typical range: M0, M3, M4, M7. For this product family, verify compiler flags match. |
| Functional Safety Standard | IEC 61508 / ISO 26262 | Specialty parameter — see datasheet for specific SIL/ASIL level. |
| Delivery Media | USB Dongle or License File | This parameter dictates whether offline development is possible. Typical range: Node-locked, floating. Values above this level usually require network licensing. |
| RoHS / REACH Status | — | Not applicable for software; physical dongle must be RoHS compliant. |
| Project Scope Restriction | 1 project | Reassignable only within same project variant. Typical range: 1 (SINGLE), 5, unlimited. |
The two most critical specifications in this table are License Type and Target Core. A perpetual license means no recurring cost, but single-project restriction prevents sharing across product lines. Engineers must verify that the Cortex-M7 variant used (e.g., STM32F7, i.MX RT) does not include an MPU – if the target silicon implements MPU, this license will fail to activate because the RTS uses non-MPU memory model. The absence of MPU support implies specific interrupt latency and context switching overheads; design implications include higher stack usage and no fault isolation, requiring careful static analysis of memory accesses.
Procurement Workflow for Licensing Media
Request from supplier the supplier-must-confirm checklist before purchase:
- Part number match: FSRTS FUSA RTS CORTEX-M7 NO MPU PERP – ensure no suffix like -FL or -DON (which indicate floating or dongle-only variants).
- License key pre-validation: Ask the supplier to provide the key hash for verification against ARM's database before shipment.
- Media integrity: For dongle deliveries, request a photograph of the physical security hologram.
- AQL level: Use normal inspection level II per ANSI/ASQ Z1.4 with an accept number of 0 defects. Sample size: for lots of 2-8 units, inspect 100%. For lots above 8, sample 5 units minimum.
Frequently Asked Questions About FSRTS FUSA RTS CORTEX-M7 NO MPU PERP
What is the difference between FSRTS FUSA RTS CORTEX-M7 NO MPU PERP and the standard Cortex-M7 RTS?
The standard RTS does not include functional safety evidence packages or certified runtime libraries according to IEC 61508/ISO 26262. The FUSA variant adds safety manuals, fault injection test reports, and a qualified compiler toolchain. The "NO MPU" suffix means the RTS is optimized for Cortex-M7 designs without a Memory Protection Unit, reducing code size and interrupt latency.
How do I verify that my license is truly perpetual and not a time-limited subscription?
Run the ARM License Manager command lmstat -a -c @localhost. Look for the license_pool attribute: it should display license_type=PERPETUAL and expiration_date=0 or a date far in the future. If the output shows MAINTENANCE_END within 12 months, the license is subscription-based or maintenance-limited.
Can I transfer the FSRTS FUSA RTS CORTEX-M7 NO MPU PERP to a different project after activation?
No. This license is permanently bound to the project specified at activation. ARM requires a new license purchase for each separate project. Project scope is defined by the product variant and brand name; derivative designs or hardware revisions count as the same project only if they share the same hazard analysis and safety case.
Where can I download the latest datasheet and safety manual for this license product?
Consult the official ARM developer portal at developer.arm.com/FUSA-RTS. The datasheet (ARM DDI 0487 and FUSA RTS Release Notes) requires an ARM account with the license serial number. Third-party sources may not have the latest safety evidence packages.
