xlsynth/bedrock-rtl
Nov 2024 – Oct 2025
12 Months active
Languages Used
BazelStarlarkSystemVerilogVerilogC++PythonRustbazel
Technical Skills
ASICAsynchronous FIFO DesignBazelCDCClock Domain Crossing (CDC)Credit Flow Control
Howard Mao
PROFILE
Howard Mao
Zhemao developed and maintained the bedrock-rtl repository, delivering robust RTL infrastructure for scalable FIFO architectures, flow control, and memory subsystems. Over twelve months, Zhemao engineered configurable, assertion-driven modules in SystemVerilog, focusing on reliability, verification coverage, and flexible resource management. The work included dynamic and shared FIFO designs, AXI protocol routing, and parameterized credit-based flow control, all validated through extensive testbenches and formal verification. By refining assertion logic, enhancing simulation coverage, and improving synthesis compatibility, Zhemao addressed concurrency, backpressure, and initialization challenges. This depth of engineering enabled safer, more maintainable hardware designs and accelerated verification cycles for production environments.
Overall Statistics
Feature vs Bugs
59%Features
Repository Contributions
186Total
Bugs
44
Commits
186
Features
64
Lines of code
32,386
Activity Months12
Your Network
226 people
Work History
October 2025
3 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 (xlsynth/bedrock-rtl): Delivered Simulation Coverage Hardening and FIFO Configuration Safety, strengthening verification fidelity and preventing unsafe dynamic FIFO configurations across dynamic FIFO and crossbar components. This work directly improves design reliability and reduces risk of missed coverage and misconfigurations in RTL validation. The changes also lay groundwork for more robust regression suites and easier future maintenance.
3 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 (xlsynth/bedrock-rtl): Delivered Simulation Coverage Hardening and FIFO Configuration Safety, strengthening verification fidelity and preventing unsafe dynamic FIFO configurations across dynamic FIFO and crossbar components. This work directly improves design reliability and reduces risk of missed coverage and misconfigurations in RTL validation. The changes also lay groundwork for more robust regression suites and easier future maintenance.
October 2025
September 2025
6 Commits • 2 Features
Sep 1, 2025September 2025 – xlsynth/bedrock-rtl monthly recap focused on delivering configurable backpressure coverage, stability hardening, and targeted code quality improvements that jointly raise verification robustness and business value. Key features and fixes delivered: - Backpressure Coverage Configurability: Introduced EnableCoverPushBackpressure to br_flow_deserializer and multi-xfer module, enabling flexible verification scenarios. Also added a parameter to disable the sendable > receivable multi-xfer check, allowing safer exploration of edge cases. (Commits: a1b51985ec61ed5cad2f24f0bf8a7026907990f1; f41a03a7df76deebce0aa3456fb9e640a887c864). - Verification and stability hardening: Strengthened stability assertions, coverage points, and related refactors across br_flow_mux_select, br_flow_mux/demux, AXI-Lite splitter, and AXI isolator to improve robustness under backpressure and ensure correct type handling. (Commits: ee35ec4eb376aaa993d3d51b0fcb49e3f9bf03f0; f267f82f29ab5141d33a21c7dc8b852851aa214b; 932bdd44cd12cee1f21a0f84d64d89f2f45fd878; ad0435625e46ad39f70e75296da625c99dd7221a). Major bugs fixed and quality improvements: - Removed dead code in AXI-Lite splitter and resolved a compiler warning in AXI isolator, contributing to cleaner synthesis paths and fewer maintainability issues. (Commits: 932bdd44cd12cee1f21a0f84d64d89f2f45fd878; ad0435625e46ad39f70e75296da625c99dd7221a). Overall impact and business value: - Increased verification flexibility and robustness in the BR flow path, reducing flaky tests and enabling safer exploration of backpressure scenarios. - Strengthened code quality and maintainability, laying groundwork for faster iteration and feature delivery in future sprints. Technologies/skills demonstrated: - SystemVerilog-based verification, backpressure modeling, AXI protocol handling, and modular RTL design; emphasis on assertions, coverpoints, and targeted refactors to improve reliability and type safety.
September 2025
6 Commits • 2 Features
Sep 1, 2025September 2025 – xlsynth/bedrock-rtl monthly recap focused on delivering configurable backpressure coverage, stability hardening, and targeted code quality improvements that jointly raise verification robustness and business value. Key features and fixes delivered: - Backpressure Coverage Configurability: Introduced EnableCoverPushBackpressure to br_flow_deserializer and multi-xfer module, enabling flexible verification scenarios. Also added a parameter to disable the sendable > receivable multi-xfer check, allowing safer exploration of edge cases. (Commits: a1b51985ec61ed5cad2f24f0bf8a7026907990f1; f41a03a7df76deebce0aa3456fb9e640a887c864). - Verification and stability hardening: Strengthened stability assertions, coverage points, and related refactors across br_flow_mux_select, br_flow_mux/demux, AXI-Lite splitter, and AXI isolator to improve robustness under backpressure and ensure correct type handling. (Commits: ee35ec4eb376aaa993d3d51b0fcb49e3f9bf03f0; f267f82f29ab5141d33a21c7dc8b852851aa214b; 932bdd44cd12cee1f21a0f84d64d89f2f45fd878; ad0435625e46ad39f70e75296da625c99dd7221a). Major bugs fixed and quality improvements: - Removed dead code in AXI-Lite splitter and resolved a compiler warning in AXI isolator, contributing to cleaner synthesis paths and fewer maintainability issues. (Commits: 932bdd44cd12cee1f21a0f84d64d89f2f45fd878; ad0435625e46ad39f70e75296da625c99dd7221a). Overall impact and business value: - Increased verification flexibility and robustness in the BR flow path, reducing flaky tests and enabling safer exploration of backpressure scenarios. - Strengthened code quality and maintainability, laying groundwork for faster iteration and feature delivery in future sprints. Technologies/skills demonstrated: - SystemVerilog-based verification, backpressure modeling, AXI protocol handling, and modular RTL design; emphasis on assertions, coverpoints, and targeted refactors to improve reliability and type safety.
August 2025
44 Commits • 8 Features
Aug 1, 2025August 2025 monthly summary for xlsynth/bedrock-rtl focusing on FPV-driven coverage, BR flow reliability, and RTL test-hardening. Delivered key features to control FPV counter coverage, enhanced BR flow robustness with a select-stability option, and expanded coverage/test capabilities to improve validation confidence. Major bug fixes across FPV coverage, BR flow components, FIFO/priority paths, and RTL integrations reduced risk of regressions and improved maintainability. The work emphasizes business value through higher RTL reliability, faster validation cycles, and more flexible coverage configurations.
44 Commits • 8 Features
Aug 1, 2025August 2025 monthly summary for xlsynth/bedrock-rtl focusing on FPV-driven coverage, BR flow reliability, and RTL test-hardening. Delivered key features to control FPV counter coverage, enhanced BR flow robustness with a select-stability option, and expanded coverage/test capabilities to improve validation confidence. Major bug fixes across FPV coverage, BR flow components, FIFO/priority paths, and RTL integrations reduced risk of regressions and improved maintainability. The work emphasizes business value through higher RTL reliability, faster validation cycles, and more flexible coverage configurations.
August 2025
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for xlsynth/bedrock-rtl: delivered a critical data-integrity feature, improved documentation accuracy, and enhanced synthesis compatibility. Achievements span parameter propagation, corrected latency guidance, counter stability, and synthesis refactors, driving more reliable design flows and faster verification cycles.
July 2025
4 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for xlsynth/bedrock-rtl: delivered a critical data-integrity feature, improved documentation accuracy, and enhanced synthesis compatibility. Achievements span parameter propagation, corrected latency guidance, counter stability, and synthesis refactors, driving more reliable design flows and faster verification cycles.
June 2025
2 Commits
Jun 1, 2025June 2025: Delivered robustness improvements to the xlsynth/bedrock-rtl RTL stack, focusing on arbiter and FIFO assertion logic. Addressed race conditions and deadlock risks in multi-FIFO configurations, including setups with no staging buffer. Corrected assertion semantics in br_flow_arb_core and added a new assertion in shared FIFO control to prevent deadlocks, resulting in a more stable, reliable RTL core and clearer failure signals. This work reduces runtime risk and improves maintainability for concurrent queue operations.
2 Commits
Jun 1, 2025June 2025: Delivered robustness improvements to the xlsynth/bedrock-rtl RTL stack, focusing on arbiter and FIFO assertion logic. Addressed race conditions and deadlock risks in multi-FIFO configurations, including setups with no staging buffer. Corrected assertion semantics in br_flow_arb_core and added a new assertion in shared FIFO control to prevent deadlocks, resulting in a more stable, reliable RTL core and clearer failure signals. This work reduces runtime risk and improves maintainability for concurrent queue operations.
June 2025
May 2025
14 Commits • 4 Features
May 1, 2025May 2025 (2025-05) focused on delivering scalable, tunable FIFO architectures, flexible BR-delay pipelines, and reliability improvements in bedrock-rtl. Delivered independent configurability for memory/data-path latency tuning, introduced a pseudo-static shared FIFO family enabling multiple logical FIFOs within a shared RAM, added non-zero initialization for BR-delay pipelines, refined counter/reset behavior for 64-bit readiness while preserving 32-bit compatibility, and implemented critical bug fixes to improve stability and predictability across the push-control and counter subsystems. This work enhances performance tuning, memory utilization, initialization flexibility, and overall reliability for production workloads.
May 2025
14 Commits • 4 Features
May 1, 2025May 2025 (2025-05) focused on delivering scalable, tunable FIFO architectures, flexible BR-delay pipelines, and reliability improvements in bedrock-rtl. Delivered independent configurability for memory/data-path latency tuning, introduced a pseudo-static shared FIFO family enabling multiple logical FIFOs within a shared RAM, added non-zero initialization for BR-delay pipelines, refined counter/reset behavior for 64-bit readiness while preserving 32-bit compatibility, and implemented critical bug fixes to improve stability and predictability across the push-control and counter subsystems. This work enhances performance tuning, memory utilization, initialization flexibility, and overall reliability for production workloads.
April 2025
19 Commits • 4 Features
Apr 1, 2025In April 2025, bedrock-rtl milestones focused on reliability, scalability, and CI reproducibility. Major enhancements to the Dynamic Shared FIFO core were delivered to improve reliability and multi-tile support, parity reliability improvements were achieved through targeted ECC updates, and build/test stability was strengthened by pinning the Bazel version. The team stabilized core module testing, aligning assertions with public APIs to reduce flaky tests. New AXI-Lite enhancements added an optional NormalizeBranchAddress feature for peripherals starting at zero, and the month also introduced infrastructure-related improvements that reduce risk in production deployments.
19 Commits • 4 Features
Apr 1, 2025In April 2025, bedrock-rtl milestones focused on reliability, scalability, and CI reproducibility. Major enhancements to the Dynamic Shared FIFO core were delivered to improve reliability and multi-tile support, parity reliability improvements were achieved through targeted ECC updates, and build/test stability was strengthened by pinning the Bazel version. The team stabilized core module testing, aligning assertions with public APIs to reduce flaky tests. New AXI-Lite enhancements added an optional NormalizeBranchAddress feature for peripherals starting at zero, and the month also introduced infrastructure-related improvements that reduce risk in production deployments.
April 2025
March 2025
4 Commits • 1 Features
Mar 1, 2025March 2025: Delivered key RTL features and robustness improvements in the bedrock-rtl project, with a focus on reliability, routing flexibility, and resource efficiency. Business value delivered includes improved correctness under bypass scenarios, more flexible AXI-Lite routing configurations, consistent partial-write behavior, and higher throughput from optimized staging in multi-FIFO paths.
March 2025
4 Commits • 1 Features
Mar 1, 2025March 2025: Delivered key RTL features and robustness improvements in the bedrock-rtl project, with a focus on reliability, routing flexibility, and resource efficiency. Business value delivered includes improved correctness under bypass scenarios, more flexible AXI-Lite routing configurations, consistent partial-write behavior, and higher throughput from optimized staging in multi-FIFO paths.
February 2025
37 Commits • 17 Features
Feb 1, 2025February 2025—bedrock-rtl (xlsynth/bedrock-rtl) delivered significant scalability and reliability improvements across buffering, credit accounting, and multi-transfer architecture, with focused business value in throughput, observability, and portability. Key features and refinements were implemented while plumbing enhancements across the data-path and control-plane to enable higher throughput and easier verification.
37 Commits • 17 Features
Feb 1, 2025February 2025—bedrock-rtl (xlsynth/bedrock-rtl) delivered significant scalability and reliability improvements across buffering, credit accounting, and multi-transfer architecture, with focused business value in throughput, observability, and portability. Key features and refinements were implemented while plumbing enhancements across the data-path and control-plane to enable higher throughput and easier verification.
February 2025
January 2025
17 Commits • 5 Features
Jan 1, 2025January 2025 (xlsynth/bedrock-rtl) delivered architecture enhancements and verification improvements to improve reliability of memory interfaces, flow control, and counter behavior, with added configurability for CDC and reset paths. The work emphasizes business-impacting reliability for high-speed interconnects and multi-port memory usage, along with expanded test coverage and per-flow visibility.
January 2025
17 Commits • 5 Features
Jan 1, 2025January 2025 (xlsynth/bedrock-rtl) delivered architecture enhancements and verification improvements to improve reliability of memory interfaces, flow control, and counter behavior, with added configurability for CDC and reset paths. The work emphasizes business-impacting reliability for high-speed interconnects and multi-port memory usage, along with expanded test coverage and per-flow visibility.
December 2024
14 Commits • 5 Features
Dec 1, 2024December 2024 — xlsynth/bedrock-rtl monthly summary Key features delivered - Freelist manager with multiple deallocation ports and multi-port freelist flow; enhanced testbench. - Multi-output priority encoder supporting top-N results with new test coverage. - Partial RAM write support via wr_word_en on flop RAMs. - Br_flow ready-valid validation module to standardize interface checks under backpressure. - Testbench reliability and latency validation improvements (corrected RamReadLatency, added random delays, stability fixes). Major bugs fixed - FIFO staging buffer correctness: fix bypass forwarding order during inflight reads; synchronize mem_valid load-enable with actual writes (de7f6aa7..., 39f5a1fa...). - Bypass and circular buffer integrity across buffers: ensure proper write enable handling for bypass data (678ded1...). - Br_flow module data loss and latency fixes: correct load-enable condition in br_flow_reg_rev and fix latency assertion in FIFO pop control (eac6fa61..., 603c1780...). Overall impact and accomplishments - Increased data integrity and reliability across memory and flow-control paths; reduced risk of data loss during high-load scenarios. - Enabled scalable resource management with multi-port freelist and top-N prioritization; improved testbench reliability reducing false failures. - Positioning for faster release cycles through assertion-driven checks and robust verification infrastructure. Technologies/skills demonstrated - SystemVerilog/RTL for FIFOs, RAMs, and multi-port memories; ready/valid protocol handling; multi-port freelist architecture; enhanced testbench design with latency-aware checks and randomized delays. Business value - Higher reliability, scalable resource management, and faster verification-driven releases, delivering tangible improvements to product robustness and time-to-market.
14 Commits • 5 Features
Dec 1, 2024December 2024 — xlsynth/bedrock-rtl monthly summary Key features delivered - Freelist manager with multiple deallocation ports and multi-port freelist flow; enhanced testbench. - Multi-output priority encoder supporting top-N results with new test coverage. - Partial RAM write support via wr_word_en on flop RAMs. - Br_flow ready-valid validation module to standardize interface checks under backpressure. - Testbench reliability and latency validation improvements (corrected RamReadLatency, added random delays, stability fixes). Major bugs fixed - FIFO staging buffer correctness: fix bypass forwarding order during inflight reads; synchronize mem_valid load-enable with actual writes (de7f6aa7..., 39f5a1fa...). - Bypass and circular buffer integrity across buffers: ensure proper write enable handling for bypass data (678ded1...). - Br_flow module data loss and latency fixes: correct load-enable condition in br_flow_reg_rev and fix latency assertion in FIFO pop control (eac6fa61..., 603c1780...). Overall impact and accomplishments - Increased data integrity and reliability across memory and flow-control paths; reduced risk of data loss during high-load scenarios. - Enabled scalable resource management with multi-port freelist and top-N prioritization; improved testbench reliability reducing false failures. - Positioning for faster release cycles through assertion-driven checks and robust verification infrastructure. Technologies/skills demonstrated - SystemVerilog/RTL for FIFOs, RAMs, and multi-port memories; ready/valid protocol handling; multi-port freelist architecture; enhanced testbench design with latency-aware checks and randomized delays. Business value - Higher reliability, scalable resource management, and faster verification-driven releases, delivering tangible improvements to product robustness and time-to-market.
December 2024
November 2024
22 Commits • 16 Features
Nov 1, 20242024-11 monthly summary for xlsynth/bedrock-rtl: focused on strengthening BR flow control, improving FIFO reliability, and enabling fundamental CDC/data-path improvements. Delivered end-to-end credit signaling enhancements, non-zero read latency support, and modular refactors to improve performance, test coverage, and maintainability. Addressed critical bugs in FIFOs and macros to stabilize throughput and correctness across BR components.
November 2024
22 Commits • 16 Features
Nov 1, 20242024-11 monthly summary for xlsynth/bedrock-rtl: focused on strengthening BR flow control, improving FIFO reliability, and enabling fundamental CDC/data-path improvements. Delivered end-to-end credit signaling enhancements, non-zero read latency support, and modular refactors to improve performance, test coverage, and maintainability. Addressed critical bugs in FIFOs and macros to stabilize throughput and correctness across BR components.
Activity
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Quality Metrics
Correctness90.8%
Maintainability88.4%
Architecture87.4%
Performance83.4%
AI Usage20.8%
Skills & Technologies
Programming Languages
BazelC++PythonRustShellStarlarkSystemVerilogTclVerilogbazel
Technical Skills
AMBA ProtocolASICASIC DesignASIC VerificationAXI ProtocolArbiter DesignArbitration LogicAssertionAssertion DevelopmentAssertion-Based VerificationAssertionsAsynchronous FIFO DesignBazelBazel Build SystemBuild System
Repositories Contributed To
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