DSTREAM-PT

The DSTREAM-PT is Arm’s high-end parallel-trace debug probe, providing non-intrusive hardware trace capture for Cortex-A, Cortex-R, and Cortex-M based SoCs. It connects to the target’s Trace Port Interface Unit (TPIU) and captures ETM trace data at up to 32-bit parallel width into an 8 GB on-probe buffer with hardware data compression, delivering up to 19.2 Gbps of captured trace bandwidth. Run-control debugging is supported via JTAG, SWD, and cJTAG interfaces, covering the full range of Arm-based targets from single-core microcontrollers to multi-core application processors.

Parallel trace capture enables code coverage analysis, execution profiling, and post-mortem crash diagnosis without halting or slowing the target processor. The captured trace stream provides a cycle-accurate record of executed instructions, which supports structural coverage evidence in safety-critical projects governed by ISO 26262, IEC 61508, and (with separately qualified analysers) DO-178C.

DSTREAM Probe Comparison

Feature	DSTREAM-PT	DSTREAM-ST
Trace Method	Parallel TPIU, capture into on-probe buffer	4-bit parallel, streamed to host
Trace Port Width	4/8/16/32-bit TPIU	4-bit TPIU
On-probe buffer	8 GB with hardware data compression	None, streams to host
Trace Bandwidth	Up to 19.2 Gbps captured	Up to 2.4 Gbps streamed
Run-Control	JTAG, SWD, cJTAG	JTAG, SWD, cJTAG
Target Architecture	Cortex-A, R, M	Cortex-A, R, M
Host IDE	Arm Development Studio	Arm Development Studio

DSTREAM-PT works with Arm Development Studio (Gold edition), providing integrated debug and trace analysis from a single toolchain. The 8 GB on-probe buffer with hardware data compression captures dense parallel trace from wide TPIU ports without bottlenecking on the host link, important when the target generates trace faster than USB can carry it in real time. For 4-bit TPIU targets where capture length matters more than peak bandwidth, the DSTREAM-ST streams directly to the host. GSAS Micro Systems stocks DSTREAM-PT units in India with manufacturer warranty and provides evaluation support, probe configuration, and training on trace-based debug workflows.