Job Title
Debug Sub-System & Design-for-Test (DFT) Engineer
Summary
We are seeking a Debug Sub-System / DFT Engineer to architect, implement, and validate the on-chip debug and test infrastructure for complex SoC and ASIC designs. This role spans the full lifecycle — from specification and RTL design of debug/DFT features through pre-silicon verification, ATPG pattern generation, and post-silicon validation. The ideal candidate combines deep DFT methodology expertise with knowledge of silicon debug subsystems, enabling efficient manufacturing test, in-field diagnostics, and post-silicon debug.

Key Responsibilities
Debug Sub-System Design & Integration

Understanding of on-chip debug infrastructure including:

JTAG TAP controllers (IEEE 1149.1/1149.6) and daisy-chain/star topologies

CoreSight / ARM Debug Architecture (DAP, SWD, ETM, CTI, cross-trigger matrices)

Trace infrastructure (ETB, ETR, TPIU, trace funnels, timestamps)

Embedded Logic Analyzers (ELA) / on-chip signal monitors

Debug authentication and security (secure debug, debug access levels, lock/unlock)

Design and integrate DFx (Design for Debug/Diagnostics) features:

Performance counters and event monitors

Error logging and first-error capture registers

Signal observation via debug muxes and pad multiplexing

Register access over debug ports (JTAG-to-APB/AHB/AXI bridges)

Debug subsystem interconnect (debug bus, cross-trigger fabric, power-domain-aware debug access)

Collaborate with architecture teams on debug use cases : boot debug, crash analysis, performance profiling, in-field diagnostics

Design-for-Test (DFT)





Understand DFT architecture for complex SoC designs, including:

Scan insertion : full scan, compressed scan (Tessent, Modus, DFT Compiler)

Memory BIST (MBIST) : controller design, repair logic, redundancy allocation

Logic BIST (LBIST) : self-test controllers, PRPG, MISR, fault coverage analysis

Boundary Scan (JTAG) : BSR chain design, IEEE 1149.1 compliance

At-speed testing : launch-on-shift, launch-on-capture, multi-clock domain handling

Drive ATPG pattern generation and achieve target fault coverage (stuck-at, transition, path delay, bridging)

Implement test compression (DFTMAX, Tessent TestKompress, EDT) to reduce test data volume and ATE test time

Design DFT for low-power : isolation, retention scan, UPF-aware DFT insertion

Handle analog/mixed-signal test interfaces (ADC/DAC BIST, PLL test modes, SerDes loopback)

Define and implement test access mechanisms (TAM) : wrapper chains, hierarchical test, IEEE 1500 wrappers for IP cores

Verification & Validation (Most Important)

Verify DFT/debug RTL through simulation and formal methods :

JTAG TAP compliance tests

Scan chain integrity checks

MBIST/LBIST functional verification

Debug authentication sequence validation

Run DRC (Design Rule Checks) for DFT:



scan rule violations, clock gating, X-sources, hold-time fixes

Perform ATPG dry runs and iterate on coverage closure with design teams

Support post-silicon DFT validation : scan pattern bring-up, MBIST execution, yield debug

Debug test escapes and drive corrective actions (pattern update, DFT ECO, coverage gap closure)

Manufacturing Test & Yield

Collaborate with test engineering and ATE teams on test program development

Optimize test cost : pattern count, test time, multi-site efficiency, compression ratio

Support yield analysis and diagnosis : failing pattern debug, defect localization, systematic vs. random fail classification

Develop and maintain DFT documentation : test architecture specs, coverage reports, test insertion guidelines

Required Qualifications

Education: B.S./M.S./Ph.D. in Electrical Engineering, Computer Engineering, or related field

Experience: 4–10+ years in DFT, debug subsystem design, or silicon test engineering

Solid expertise in one or both domains:

Proficiency in RTL design using Verilog/SystemVerilog

Experience with industry DFT tools :

Knowledge of JTAG/IEEE 1149.1 standard and TAP controller state machine

Experience with ATPG pattern generation , fault models (SA0/SA1, transition, IDDQ), and coverage analysis

Familiarity with memory test (March algorithms, repair, redundancy, fuse programming)

Strong scripting skills : Tcl, Python, Perl for tool automation and flow development

Understanding of SoC integration and multi-IP DFT challenges

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📌 Design for Test (DFT) Engineer - north york (Ontario)
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