SEGGER J-Trace PRO Cortex-M Streaming Trace Debugger (8.18.00)

Product Code: 8.18.00

Professional ARM Cortex-M Trace Debugging Image Placeholder — J-Trace PRO Connected to Target Board The SEGGER J-Trace PRO Cortex-M represents a significant advancement in ARM Cortex-M debugging technology. Unlike conventional debug probes that rely on limited internal trace buffers, this professional instrument provides unlimited streaming trace capabilities through high-speed SuperSpeed USB 3.0 and Gigabit Ethernet interfaces. Streaming Trace Technology Traditional trace solutions capture instruction data in finite internal buffers, typically 4-32MB, which fills rapidly at high CPU frequencies. The J-Trace PRO Cortex-M eliminates this constraint by continuously streaming trace data to the host computer in real-time. This enables capture periods extending from minutes to months without data loss. The 64MB internal trace buffer provides temporary storage during streaming interruptions, ensuring no trace data is lost during brief USB or network disconnections. ETM Instruction Tracing ARM Cortex-M cores with Embedded Trace Macrocell (ETM) capability output detailed instruction execution information through dedicated trace pins.

The J-Trace PRO captures this data at up to 150MHz trace clock frequencies, providing complete visibility into program execution flow. Trace Type Information Captured Use Cases Instruction Trace Every executed instruction with timing Program flow analysis, performance profiling Data Trace Memory read/write operations Data flow debugging, cache analysis Exception Trace Interrupt and exception handling RTOS debugging, timing analysis Live Analysis Capabilities The streaming trace architecture enables sophisticated real-time analysis whilst the target executes at full speed. The included Ozone debugger processes trace data as it arrives, providing immediate insights into system behaviour. Live Code Profiling Execution profiling operates continuously without target performance impact. The system identifies function execution times, call frequencies, and performance bottlenecks in real-time. Engineers can observe hotspots developing during extended test runs and optimise accordingly. Live Code Coverage Instruction-level code coverage monitoring tracks which portions of the application execute during testing. This feature proves essential for safety-critical applications requiring verification that all code paths have been exercised according to regulatory standards such as DO-178C or ISO 26262. Hardware Architecture The J-Trace PRO Cortex-M features dual high-speed interfaces for maximum flexibility. SuperSpeed USB 3.0 provides up to 5Gbps bandwidth for streaming trace data, whilst the Gigabit Ethernet interface enables remote debugging scenarios. Image Placeholder — J-Trace PRO Block Diagram Interface Bandwidth Use Case Benefits USB 3.0 5 Gbps Direct PC connection Highest bandwidth, simple setup Gigabit Ethernet 1 Gbps Remote debugging Network access, isolation from EMI Target Interface Specifications The probe provides separate connectors for debug and trace signals. The debug connector supports standard JTAG and SWD protocols at up to 50MHz clock frequencies. The dedicated trace connector handles high-speed ETM data capture. Debug Connector (20-pin 0.1") JTAG: TDI, TDO, TCK, TMS, TRST SWD: SWDIO, SWDCLK Power: VTref, VCPout, Reset Control: nSRST, RTCK Trace Connector (20-pin 0.05") Trace Clock: TRACECLK Trace Data: TRACEDATA[3:0] SWO: Single Wire Output Power and Ground Software Integration The J-Trace PRO Cortex-M integrates seamlessly with existing development workflows. The probe operates with all major toolchains and IDEs through standard GDB remote protocol support. Included Software Ozone Debugger: Professional graphical debugger with trace analysis J-Flash: High-speed flash programming utility J-Link GDB Server: GDB remote protocol server RTT Client: Real-Time Transfer communication tool IDE Compatibility Development Environment Integration Method Trace Support IAR Embedded Workbench Native plugin Full ETM analysis Keil µVision MDK Native plugin Complete trace features Eclipse CDT GDB remote protocol Basic trace viewing Visual Studio Code Cortex-Debug extension Trace data export Performance Specifications Key Performance Metrics Maximum trace clock frequency: 150 MHz Flash programming speed: Up to 4.0 MB/s Target interface speed: Up to 50 MHz SWO speed: Up to 100 MHz Maximum CPU frequency: Unlimited Trace Setup Example Setting up streaming trace typically requires minimal target modifications. Most development boards expose trace pins on debug connectors. // STM32F4 ETM configuration example void configure_etm_trace(void) { // Enable trace and debug clocks RCC->AHB1ENR |= RCC_AHB1ENR_ETMEN; CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk; // Configure trace pins (PE2-PE6) GPIOE->MODER |= (2 << 4) | (2 << 6) | (2 << 8) | (2 << 10) | (2 << 12); GPIOE->AFR |= (0 << 8) | (0 << 12) | (0 << 16) | (0 << 20) | (0 << 24); // Setup ETM for instruct