JTAG and SWD debug hardware
The following debug hardware probes and integrations are available, for direct access into Arm's CoreSight debug and trace architecture:
Maximum visibility into Arm processors, with up to 2.4 Gbps parallel trace over 4 pins, streams trace data directly to host PC, system autodetection with Development Studio and a range of target connectors including JTAG, MICTOR and CoreSight.
JTAG or SWD debug connections to Arm-based microcontrollers running at clock speeds of up to 200 MHz. ULINKpro allows ETM trace capture at up to 800 Mbps and streaming trace direct to Keil MDK.
For simple debug over driverless USB, CMSIS-DAP provides an abstraction of the CoreSight Debug Access Port command set. The JTAG/SWD connection is incorporated into the board-level layout.
The benefits of high-speed serial trace
Trace is an essential tool for the resolution of complex software/hardware and timing-related issues, as it enables post-analysis of a software execution without the need for any software or hardware.
Trace can either be collected using the default parallel trace probe supplied with DSTREAM-PT or alternatively, using the High-Speed Serial Trace Probe (HSSTP). This allows for high- bandwidth serial trace capture of up to 60 Gbps from Arm HSSTP or Marvell® SETM.
Trace configuration and analysis in Development Studio
Development Studio offers advanced configuration options for collecting trace data and analysis with the Trace view. You can start focusing only on the critical sections of a program and avoid filling the trace buffer rapidly when collecting High-Speed Serial Trace.
- Use tracepoints to start and stop trace at specific points in your code
- Filter trace data types that you're interested in
- Search for timestamps, functions and instructions by addresses to sift through trace data quickly and efficiently
Debug Probes Comparison
|Functionality||Debug, Trace||Debug, Streamed Trace||Debug|
|Cortex-A series support||All||All||Supported Devices based on
|Cortex-R series support||All||All||Supported Devices based on
|Cortex-M series support||All||All||Supported Devices based on any Cortex-M|
|Arm11 series support||All||All||-|
|Arm9 series support||All||All||-|
|Arm7 series support||All||All||-|
|Maximum number of cores||128* (See Cores + CoreSight devices limit)||1022* (See Cores + CoreSight devices limit)||4|
|Debug connectivity||JTAG, SWD||JTAG, SWD||JTAG, SWD|
|JTAG frequency (MHz)||60||180||50|
|Memory download (KB/s)||2500||12000||1000|
|External parallel trace||Up to 16 pins||Up to 4 pins||-|
|External serial trace||HSSTP, SETM||-||-|
|Trace buffer||4 GB||None - streamed to host PC||-|
|Cores + CoreSight devices limit||254 (up to 128 CPUs)||1022||-|
|Host connectivity||USB 2.0, Ethernet||USB 3.0, Gigabit Ethernet||USB 2.0|