DSTREAM Family Comparison

Arm’s DSTREAM family is the high-end debug-and-trace probe line for Cortex-M, Cortex-R, and Cortex-A SoCs. Per Arm’s DSTREAM product page, the family spans four probes: DSTREAM-ST (the second-generation streaming-trace probe) and DSTREAM-PT (the wide-parallel-trace probe with on-probe buffer), which this comparison covers, plus the specialised DSTREAM-HT (high-speed serial trace) and DSTREAM-XT (PCIe trace) for application-class and server-class silicon. For Indian semiconductor design centres in Bengaluru, Hyderabad, Chennai, and Pune evaluating which probe to standardise on for an SoC bring-up, this is the GSAS Micro Systems decision matrix.

GSAS is Arm’s authorized partner in India for Arm Development Tools. We quote each in INR with the standard Indian procurement options (GeM, SAP Ariba, Coupa, TReDS) and provide on-site application engineering for ETM trace setup and CoreSight configuration. For very high-bandwidth use cases beyond what ST and PT cover, Arm offers the specialised DSTREAM-HT (HSSTP serial trace) and DSTREAM-XT (PCIe trace on Neoverse-class designs); talk to GSAS and we will quote the right probe for your programme.

At-a-glance comparison

Pick the right probe by use case

Your target exposes a 4-bit TPIU and you need long captures

→ DSTREAM-ST. ST streams 4-bit TPIU trace continuously to the host at up to 2.4 Gbps, so total capture duration is bounded by host storage rather than an on-probe buffer. For Cortex-M / Cortex-R firmware bugs that surface only after minutes of operation, ST captures enough trace to walk back from the failure point through the contributing call sequence. Indian motor-control, automotive-ECU, and industrial-controls teams chasing intermittent bugs on 4-bit TPIU targets typically standardise on ST.

Your target SoC has a wide parallel trace port (8-bit / 16-bit / 32-bit TPIU)

→ DSTREAM-PT. When the target exposes a wide parallel TPIU, typical of modern Cortex-M / Cortex-R chip designs from major silicon vendors, DSTREAM-PT captures the parallel trace at full port width into an 8 GB on-probe buffer with hardware data compression (up to 19.2 Gbps captured). This is the right probe for next-generation MCU bring-ups in Indian Tier-1 ECU programmes where the silicon team has spec’d the wider trace port specifically.

Your SoC needs higher-bandwidth trace than PT can handle

For application-class SoCs that move trace off-chip via High-Speed Serial Trace Port (HSSTP) or PCIe-based debug, high-end Cortex-A application processors and Neoverse-class server platforms, Arm offers two specialised probes beyond ST and PT: DSTREAM-HT for HSSTP serial trace and DSTREAM-XT for PCIe-based trace. GSAS supplies DSTREAM-ST and DSTREAM-PT from stock in India and can quote DSTREAM-HT or DSTREAM-XT on request.

Common Indian customer scenarios

What’s the same across ST and PT

• IDE integration: both probes are first-class Arm Development Studio devices. Switching between probes is configuration, not migration.
• CoreSight support: ETM (instruction trace), STM (system trace), and the broader CoreSight infrastructure are universal across the family.
• JTAG / SWD / cJTAG target connection on both probes, standard Arm debug protocols.
• Host platform: Windows and Linux through Arm Development Studio.
• Indian procurement: INR via GSAS, GeM / Ariba / Coupa / TReDS supported.

When you don’t need a DSTREAM at all

For lower-end Cortex-M debugging, single-developer firmware projects, small-team Cortex-M0+ / M3 / M4 work, training and education, the ULINK family (ULINK2, ULINKplus, ULINKpro, ULINKpro D) is the right choice. ULINKplus adds power measurement; ULINKpro adds ETM streaming. The DSTREAM family is the right answer when you are bringing up an SoC, not iterating on a single Cortex-M product.

Why Indian teams buy DSTREAM probes from GSAS

• INR procurement: GeM, SAP Ariba, Coupa, TReDS supported. GST-compliant invoicing.
• On-site application engineering: ETM trace setup, CoreSight component selection, parallel-TPIU buffer sizing. Reachable from Bengaluru, Hyderabad, Chennai, Pune, Mumbai, Delhi NCR, and Visakhapatnam.
• Cross-probe compare: we run DSTREAM-ST vs PT side-by-side on your target during the pre-sales evaluation when the right answer isn’t obvious from the spec sheet.
• Authorized Arm engineering partner since 2018: a long-standing Arm tools partner across India.

Talk to GSAS about the right DSTREAM probe for your project →