Arm ULINKpro
Debug & TraceHigh-speed debug and trace probe with ETM streaming trace and code-coverage support for Arm Cortex-M, JTAG up to 50 MHz, SWV up to 100 Mbit/s (Manchester), ETM up to 800 Mbit/s, memory R/W up to 1 MB/s, per Arm's published ULINKpro specifications. Local stock and support across India, GSAS.
Interface
JTAG, SWD
JTAG clock
Up to 50 MHz
Target voltage
1.2 V to 3.3 V, 5 V tolerant (5 V-only devices need the optional 5V Adapter)
SWV trace
Up to 100 Mbit/s (Manchester encoding)
ETM trace
4-bit parallel TPIU, up to 800 Mbit/s
Memory R/W (download)
Up to 1 MB/s (Arm/Keil-published ULINKpro specification)
Coverage
Statement + branch coverage in gcov format (Arm-published)
Cores
Arm7, Arm9 and all Cortex-M (per Arm ULINKpro Device Support)
Host
USB 2.0
IDE
Keil MDK
Overview
About ULINKpro
The Arm ULINKpro is the top-tier debug-and-trace adapter in the Keil ecosystem, providing ETM streaming trace via a 4-bit parallel trace port (up to 800 Mbit/s) for non-intrusive cycle-accurate instruction trace on Arm Cortex-M microcontrollers. SWV runs at up to 100 Mbit/s in Manchester-encoded mode for higher-throughput data-trace capture compared to the legacy UART-mode SWO on ULINK2. Run-control JTAG operates at up to 50 MHz; memory R/W (flash download) is rated at up to 1 MB/s. Arm publishes all four figures itself, on the ULINKpro product page and in the Keil ULINKpro specification list, the latter giving the SWV rate as up to “100Mbit/s (Manchester mode)”.
ULINKpro supports the structural coverage workflows used in IEC 61508 / ISO 26262 / DO-178C tool-qualification efforts: the probe captures ETM trace from the running target; the coverage analyser (e.g. Razorcat TESSY, LDRA, or VectorCAST) consumes the trace and emits the qualified coverage evidence. Note: the probe itself is not safety-qualified, qualification flows through the analyser that processes the trace. Arm publishes coverage output in gcov format (statement, branch); MC/DC coverage is produced by the downstream analyser, not directly by ULINKpro.
Key Features
| Feature | Specification |
|---|---|
| Trace Type | ETM streaming trace (continuous, non-intrusive) |
| Trace Port | 4-bit parallel TPIU, up to 800 Mbit/s |
| SWV | Up to 100 Mbit/s (Manchester encoding) |
| JTAG clock | Up to 50 MHz |
| Trace clock | Up to 100 MHz |
| Host Connection | USB 2.0 |
| Memory R/W (flash download) | Up to 1 MB/s (Arm/Keil-published ULINKpro specification) |
| Coverage output | gcov-format (statement, branch); MC/DC produced by external qualified analyser |
| Debug Interface | JTAG and SWD |
| Target Architecture | Arm7, Arm9 and all Cortex-M (ETM instruction trace is Cortex-M3, Cortex-M4 and Cortex-M7) |
ULINKpro vs ULINKplus
ULINKpro and ULINKplus serve different needs within the Keil MDK ecosystem. ULINKpro is the right choice when your project demands ETM instruction trace, coverage data feeding a downstream qualified coverage analyser, or long-duration trace capture for timing analysis and defect reproduction. ULINKplus is the better fit when power measurement, 1 kV galvanic isolation, and hardware-in-the-loop test I/O are priorities, such as IoT and battery-powered device development where correlating energy consumption with code execution is essential. Teams working on safety-critical Cortex-M firmware typically choose ULINKpro paired with a TÜV-qualified analyser (TESSY / LDRA / VectorCAST) for their structural-coverage evidence; teams optimising power profiles and validating hardware integration choose ULINKplus. Both are available from GSAS with local stock, INR invoicing, and application support.
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