lowRISC/opentitan
Nov 2024 – Oct 2025
12 Months active
Languages Used
HjsonSystemVerilogElispTcl
Technical Skills
Coverage AnalysisFault InjectionHardware DesignHardware VerificationTestbench DevelopmentVerification
Kinza Qamar
PROFILE
Kinza Qamar
K.Q. Zaman contributed to the lowRISC/opentitan repository by developing and maintaining robust hardware verification infrastructure, focusing on security-critical IPs such as rom_ctrl and rv_plic. Over twelve months, Zaman enhanced formal and simulation-based verification using SystemVerilog, UVM, and Tcl scripting, implementing assertion-driven coverage, fault injection, and testbench hardening to improve reliability and reduce post-silicon risk. Their work included refactoring RTL for maintainability, aligning verification across simulators, and streamlining configuration management. By addressing both feature development and bug fixes, Zaman delivered deeper coverage, reduced verification noise, and enabled more deterministic, maintainable regression cycles for complex hardware designs.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
84Total
Bugs
12
Commits
84
Features
12
Lines of code
4,919
Activity Months12
Your Network
108 people
Work History
October 2025
1 Commits
Oct 1, 2025October 2025 highlights for the lowRISC/opentitan DV and verification configuration: - Streamlined the verification environment by cleaning up the verification sequence (vseq) artifacts and references. Removed an empty vseq file and all its references. - Updated configuration files to point to a base verification sequence, eliminating dependency on the removed sequence and reducing maintenance burden. - This change improves consistency and reproducibility of verification runs across CI and local environments.
1 Commits
Oct 1, 2025October 2025 highlights for the lowRISC/opentitan DV and verification configuration: - Streamlined the verification environment by cleaning up the verification sequence (vseq) artifacts and references. Removed an empty vseq file and all its references. - Updated configuration files to point to a base verification sequence, eliminating dependency on the removed sequence and reducing maintenance burden. - This change improves consistency and reproducibility of verification runs across CI and local environments.
October 2025
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for lowRISC/opentitan focused on stabilizing the RSTMGR consistency fault injection test to improve reliability of fault-path verification across simulators. The fix aligns the fault injection path with the intended consistency fault and ensures the alert handler escalation is consistently triggered. This reduces CI test flakiness and strengthens coverage for a critical safety-related path in opentitan.
September 2025
1 Commits
Sep 1, 2025September 2025 monthly summary for lowRISC/opentitan focused on stabilizing the RSTMGR consistency fault injection test to improve reliability of fault-path verification across simulators. The fix aligns the fault injection path with the intended consistency fault and ensures the alert handler escalation is consistently triggered. This reduces CI test flakiness and strengthens coverage for a critical safety-related path in opentitan.
August 2025
7 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for lowRISC/opentitan: Strengthened verification reliability for the Darjeeling hardware target and improved cross-simulator stability. Key feature delivered: per-instance randomization across simulators to better mirror Xcelium behavior. Major bugs fixed: consolidated verification-environment correctness and interface alignment, including assertion macro syntax and naming fixes, interface bindings updates, and test-sequence adjustments to reflect hardware capabilities (no USB, dual ROM interfaces, no Flash); removal of obsolete verification-path entries to ensure reliability. Overall impact: increased verification reliability, reduced flaky tests, and faster triage for hardware bring-up. Technologies/skills demonstrated: SystemVerilog/DV, UVM-style verification, cross-simulator compatibility, code cleanup, and strong attention to hardware constraints; demonstrated experience with VCS and Xcelium.
7 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for lowRISC/opentitan: Strengthened verification reliability for the Darjeeling hardware target and improved cross-simulator stability. Key feature delivered: per-instance randomization across simulators to better mirror Xcelium behavior. Major bugs fixed: consolidated verification-environment correctness and interface alignment, including assertion macro syntax and naming fixes, interface bindings updates, and test-sequence adjustments to reflect hardware capabilities (no USB, dual ROM interfaces, no Flash); removal of obsolete verification-path entries to ensure reliability. Overall impact: increased verification reliability, reduced flaky tests, and faster triage for hardware bring-up. Technologies/skills demonstrated: SystemVerilog/DV, UVM-style verification, cross-simulator compatibility, code cleanup, and strong attention to hardware constraints; demonstrated experience with VCS and Xcelium.
August 2025
July 2025
6 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for lowRISC/opentitan: Delivered a major cleanup and overhaul of the RV_PLIC verification framework and aligned FPV assertions, driving improved verification coverage, reduced maintenance overhead, and clearer signal of correctness for critical PLIC paths. The work accelerates formal verification cycles and reduces risk in release readiness.
July 2025
6 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for lowRISC/opentitan: Delivered a major cleanup and overhaul of the RV_PLIC verification framework and aligned FPV assertions, driving improved verification coverage, reduced maintenance overhead, and clearer signal of correctness for critical PLIC paths. The work accelerates formal verification cycles and reduces risk in release readiness.
June 2025
12 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan focused on verification robustness and FPV coverage improvements. Key outcomes include UVM constructor default name cleanup across multiple verification components to standardize new() usage and reduce Verissimo complaints; rv_plic FPV coverage refinement excluding alert-related components and removal of related waivers; FPV verification enhancements with stopat-based gating for assertions to ensure preconditions are met before checks. These changes improve verification reliability, reduce false positives, and speed debugging; Technologies demonstrated include UVM, SystemVerilog, coverage analysis, and stopat-based gating in FPV.
12 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for lowRISC/opentitan focused on verification robustness and FPV coverage improvements. Key outcomes include UVM constructor default name cleanup across multiple verification components to standardize new() usage and reduce Verissimo complaints; rv_plic FPV coverage refinement excluding alert-related components and removal of related waivers; FPV verification enhancements with stopat-based gating for assertions to ensure preconditions are met before checks. These changes improve verification reliability, reduce false positives, and speed debugging; Technologies demonstrated include UVM, SystemVerilog, coverage analysis, and stopat-based gating in FPV.
June 2025
May 2025
16 Commits • 2 Features
May 1, 2025May 2025 monthly summary for lowRISC/opentitan focusing on verification and FPV enhancements. Key features delivered and bugs fixed improved coverage accuracy and verification reliability, enabling faster regression cycles and higher confidence in RTL and verification environments.
May 2025
16 Commits • 2 Features
May 1, 2025May 2025 monthly summary for lowRISC/opentitan focusing on verification and FPV enhancements. Key features delivered and bugs fixed improved coverage accuracy and verification reliability, enabling faster regression cycles and higher confidence in RTL and verification environments.
April 2025
8 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan focusing on verification reliability and testbench maintainability. Key work centered on RV_PLIC FPV enhancements and TLUL testbench cleanup. The changes improve data/response integrity checks, add level-triggered interrupt validation, refine coverage waivers, and streamline assertion logic to reduce undetectable coverage.
8 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for lowRISC/opentitan focusing on verification reliability and testbench maintainability. Key work centered on RV_PLIC FPV enhancements and TLUL testbench cleanup. The changes improve data/response integrity checks, add level-triggered interrupt validation, refine coverage waivers, and streamline assertion logic to reduce undetectable coverage.
April 2025
March 2025
9 Commits
Mar 1, 2025March 2025 monthly summary focused on strengthening verification robustness and RTL correctness in lowRISC/opentitan. Delivered formal verification hardening for rv_plic and a state-machine correctness fix in prim_diff_decode, with targeted assertions, coverage management, and dead/undetectable code cleanups. These efforts reduced false positives, improved coverage accuracy, and increased release confidence while showcasing proficiency in FPV, RTL design, and testbench maintenance.
March 2025
9 Commits
Mar 1, 2025March 2025 monthly summary focused on strengthening verification robustness and RTL correctness in lowRISC/opentitan. Delivered formal verification hardening for rv_plic and a state-machine correctness fix in prim_diff_decode, with targeted assertions, coverage management, and dead/undetectable code cleanups. These efforts reduced false positives, improved coverage accuracy, and increased release confidence while showcasing proficiency in FPV, RTL design, and testbench maintenance.
February 2025
4 Commits • 1 Features
Feb 1, 2025February 2025 in opentitan: Delivered reliability and verification improvements that strengthen security IP readiness and reduce verification toil. Key outcomes include a fix for an alert processing race during ping handshakes to ensure correct alert sequencing under concurrent activity, and the introduction of Flexible Formal Verification Waivers enabling multiple waiver files after load along with dedicated waivers for code coverage analysis and formal property analysis. These efforts reduce verification noise, shorten validation cycles, and increase confidence in hardware security features. The work demonstrates proficiency in design verification, formal methods, and verification scripting within the opentitan project, with clear contributions to dv and fpv workflows.
4 Commits • 1 Features
Feb 1, 2025February 2025 in opentitan: Delivered reliability and verification improvements that strengthen security IP readiness and reduce verification toil. Key outcomes include a fix for an alert processing race during ping handshakes to ensure correct alert sequencing under concurrent activity, and the introduction of Flexible Formal Verification Waivers enabling multiple waiver files after load along with dedicated waivers for code coverage analysis and formal property analysis. These efforts reduce verification noise, shorten validation cycles, and increase confidence in hardware security features. The work demonstrates proficiency in design verification, formal methods, and verification scripting within the opentitan project, with clear contributions to dv and fpv workflows.
February 2025
January 2025
10 Commits • 2 Features
Jan 1, 2025January 2025 performance summary for lowRISC/opentitan focusing on rom_ctrl IP maintainability, verification enhancements, and a critical fix to synchronous FIFO read-valid logic. Key outcomes include improved RTL readability and maintainability across environment configuration, scoreboard, and sequence libraries; enhanced coverage and test sequencing controls with exclusions and refined assertions; and a robust fix to rvalid_o signaling that improves simulation reliability and coverage. Business value highlights: - Reduced risk from rom_ctrl changes due to cleaner, more maintainable code and clearer interfaces. - Faster regression and higher confidence in RTL verification from DV coverage improvements. - Improved FIFO read-valid behavior reduces simulation gaps and supports more deterministic verification. Top 3-5 achievements: 1) Rom_ctrl IP Maintainability and Cleanup: refactor SystemVerilog rom_ctrl IP, introducing extern methods; applies across environment configuration, scoreboard, and sequence libraries. Commits: 24e31f4ee7a174e557adf98eca1fc926f179de0c; bdf09e4c84a185ef613a50b030a0f9b1a96fd8ab. 2) Rom_ctrl Verification and Coverage Enhancements: address coverage holes, add test sequencing timing control, introduce coverage exclusions, refine assertion control during fault injection, update coverage rules to reflect RTL changes. Commits include: 81ebe5f770d5902404a23d47858bf6927f70e163; a6e807023a48fa59fd1ea38ffc75ef7fb8c949da; a048f3214d78c9837c59ecf9b7d7c48c355e4b7a; 88b3d484a7278a5b4e04d56a8e07baf630513d96; 4d118f0dd25add17358ac25b9e93e5fa19c5f1d2; fc4dd1962f3b4fc29b34bfcabbc4a0a3bc9c3d06; 406756c4ab96d88149153e0cf01942a79e44177f. 3) Fix read valid logic for synchronous FIFO: Correct rvalid_o assertion logic based on Pass, FIFO empty, and reset states; covers reset/empty edge case and improves simulation coverage. Commit: 5c37eb4e27ca31ee5de75fb714f1af081442bedd.
January 2025
10 Commits • 2 Features
Jan 1, 2025January 2025 performance summary for lowRISC/opentitan focusing on rom_ctrl IP maintainability, verification enhancements, and a critical fix to synchronous FIFO read-valid logic. Key outcomes include improved RTL readability and maintainability across environment configuration, scoreboard, and sequence libraries; enhanced coverage and test sequencing controls with exclusions and refined assertions; and a robust fix to rvalid_o signaling that improves simulation reliability and coverage. Business value highlights: - Reduced risk from rom_ctrl changes due to cleaner, more maintainable code and clearer interfaces. - Faster regression and higher confidence in RTL verification from DV coverage improvements. - Improved FIFO read-valid behavior reduces simulation gaps and supports more deterministic verification. Top 3-5 achievements: 1) Rom_ctrl IP Maintainability and Cleanup: refactor SystemVerilog rom_ctrl IP, introducing extern methods; applies across environment configuration, scoreboard, and sequence libraries. Commits: 24e31f4ee7a174e557adf98eca1fc926f179de0c; bdf09e4c84a185ef613a50b030a0f9b1a96fd8ab. 2) Rom_ctrl Verification and Coverage Enhancements: address coverage holes, add test sequencing timing control, introduce coverage exclusions, refine assertion control during fault injection, update coverage rules to reflect RTL changes. Commits include: 81ebe5f770d5902404a23d47858bf6927f70e163; a6e807023a48fa59fd1ea38ffc75ef7fb8c949da; a048f3214d78c9837c59ecf9b7d7c48c355e4b7a; 88b3d484a7278a5b4e04d56a8e07baf630513d96; 4d118f0dd25add17358ac25b9e93e5fa19c5f1d2; fc4dd1962f3b4fc29b34bfcabbc4a0a3bc9c3d06; 406756c4ab96d88149153e0cf01942a79e44177f. 3) Fix read valid logic for synchronous FIFO: Correct rvalid_o assertion logic based on Pass, FIFO empty, and reset states; covers reset/empty edge case and improves simulation coverage. Commit: 5c37eb4e27ca31ee5de75fb714f1af081442bedd.
December 2024
8 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan focusing on verification-driven improvements for ROM_ctrl IP. Delivered consolidated ROM_ctrl IP verification coverage enhancements, FSM logic stabilization, and robust handling of non-occurring tlul_adapter_sram cases to improve coverage accuracy and reliability. Implemented exclusion rules and targeted coverage adjustments to reduce noise and ensure deterministic verification results. Expanded verification tooling with assertion coverage collection for tlul_adapter_sram, refined conditional coverage handling, and removed unused coverage options (e.g., optional assert coverage) to streamline results. Overall, these changes increase confidence in ROM_ctrl IP quality, reduce post-silicon risk, and provide clearer visibility into coverage metrics. Technologies demonstrated include SystemVerilog/UVM verification, coverage-driven verification, tlul protocol handling, and FSM debugging.
8 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for lowRISC/opentitan focusing on verification-driven improvements for ROM_ctrl IP. Delivered consolidated ROM_ctrl IP verification coverage enhancements, FSM logic stabilization, and robust handling of non-occurring tlul_adapter_sram cases to improve coverage accuracy and reliability. Implemented exclusion rules and targeted coverage adjustments to reduce noise and ensure deterministic verification results. Expanded verification tooling with assertion coverage collection for tlul_adapter_sram, refined conditional coverage handling, and removed unused coverage options (e.g., optional assert coverage) to streamline results. Overall, these changes increase confidence in ROM_ctrl IP quality, reduce post-silicon risk, and provide clearer visibility into coverage metrics. Technologies demonstrated include SystemVerilog/UVM verification, coverage-driven verification, tlul protocol handling, and FSM debugging.
December 2024
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 — Opentitan ROMCTRL TLUL adapter SRAM testing: Delivered enhanced testing coverage and robustness. Implemented fault-injection proxy binds, introduced a comprehensive test plan, and adjusted the testbench to robustly handle fault scenarios. Increased coverage of security-critical functionalities within rom_ctrl. No major bugs closed; focus on strengthening verification infrastructure to reduce production risk. Tech emphasis: DV/verification, coverage-driven development, fault injection, testbench hardening, and security functionality testing.
November 2024
2 Commits • 1 Features
Nov 1, 2024November 2024 — Opentitan ROMCTRL TLUL adapter SRAM testing: Delivered enhanced testing coverage and robustness. Implemented fault-injection proxy binds, introduced a comprehensive test plan, and adjusted the testbench to robustly handle fault scenarios. Increased coverage of security-critical functionalities within rom_ctrl. No major bugs closed; focus on strengthening verification infrastructure to reduce production risk. Tech emphasis: DV/verification, coverage-driven development, fault injection, testbench hardening, and security functionality testing.
Activity
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Quality Metrics
Correctness91.2%
Maintainability90.8%
Architecture89.6%
Performance84.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
ElispHjsonSystemVerilogTcl
Technical Skills
Assertion DevelopmentAssertion ManagementAssertion RemovalAssertion WritingAssertion-Based VerificationAssertionsConfiguration ManagementCoverageCoverage AnalysisDUT InteractionDigital DesignFPGA DevelopmentFPGA VerificationFPVFPV (Formal Verification)
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