HSB IP Def Skill

Purpose

Use this skill through four workflows:

• Generate a HOLOLINK_def.svh from confirmed board requirements.
• Validate an existing def file with the bundled validator.
• Explain / Reason about HSB IP macros, legality, and macro-driven ports.
• Compare two def files semantically.

Scope

This skill owns the contents of HOLOLINK_def.svh: \definedirectives,localparamarrays, theHOLOLINK_pkgwrapper, and boot-timeinit_reg[]sequence. The surrounding top-level wrapper is owned byhsb-ip-create-top; packetizer-only profile derivation can be delegated to hsb-ip-packetizer`.

The file must use the standard guard plus package HOLOLINK_pkg wrapper. Load references/macro-reference.md for the full wrapper requirement and per-macro semantics.

Prerequisites

• Python 3.9+ is required for the bundled scripts; PyYAML is required when reading YAML profiles.
• The user must confirm file writes and shell commands unless they already asked for that exact operation.
• A concrete def file path, pasted content, or confirmed generation profile is required before script-backed validation or generation.
• Live HSB IP source is optional but preferred when validating against a specific checked-out IP revision.

Instructions

• Run bundled script preflight from references/script-usage.md before Generate, Validate, Compare, or script-backed legality checks.
• Never silently default a macro during Generate. Show the proposed value or inferred requirement and get user confirmation.
• Ask one requirements question per turn during chat-driven Generate.
• Use sensor-agnostic language unless the user says the design is camera-specific.
• Avoid unsupported "typical", "common", "most designs", or corpus-frequency claims. Anchor choices to IP behavior, documented constraints, or user requirements.
• Always surface HD-W3xx footgun warnings, even when the user asks only about errors.
• Do not generate FPGA_top.sv; offer handoff to hsb-ip-create-top after a generated def file is validated.
• Treat unfamiliar macros as project-specific unless they are documented in this skill's references or live HSB IP source.

Security Considerations

This skill can read and write local files and run shell commands through its bundled scripts. Before running a command or writing a file, state the command or path and get user confirmation unless the user already explicitly requested that exact operation. For pasted HOLOLINK_def.svh content, write only to a safely generated file in an isolated temporary directory and remove it after validation unless the user asks to keep it.

Version, Compatibility, And Live Source

This skill targets HSB IP rev 16'h2604 and is backward-compatible with 16'h2603. Live HSB IP source supersedes bundled references.

When source-sensitive behavior matters:

1. Locate <hsb-ip-root>/top/HOLOLINK_top.sv. Known roots include hw/nvcpu_dgx_fpga/vrtl/hololink/ and public-release fpga/nv_hsb_ip/.
2. Read HOLOLINK_REV and HOLOLINK_BACKWARD_COMPAT_REV.
3. Trust live source for consumed macros, port gates, and RTL behavior when it differs from bundled references.
4. Pass --ip-source <root> to scripts/validate_def.py when validating against a known source root.

Public-doc baseline:

• https://github.com/nvidia-holoscan/holoscan-sensor-bridge/blob/release-2.6.0-EA/docs/user_guide/ip_integration.md
• https://github.com/nvidia-holoscan/holoscan-sensor-bridge/blob/release-2.6.0-EA/docs/user_guide/port_description.md

Workflow Decision

1. Generate when the user asks to create, scaffold, draft, design, or produce a HOLOLINK_def.svh.
2. Validate when the user asks to lint, check, validate, or review a HOLOLINK_def.svh.
3. Explain / Reason when the user asks what a macro does, whether a combination is legal, why validation fails, or how a macro affects HOLOLINK_top.
4. Compare when the user asks to diff two def files or understand what changed between configurations.

Generate

Load references/generate-workflow.md and references/script-usage.md.

Follow the detailed Generate workflow in the reference: run preflight, classify supplied requirements, ask one requirements question per turn, build a flat YAML profile, run scripts/generate_def.py, show provenance for generated fields, and offer handoff to hsb-ip-create-top.

When packetizer fields are needed, invoke hsb-ip-packetizer with the known RX count, RX widths, and the user's data-manipulation description. Consume only that skill's packetizer_profile_overlay YAML keys, merge them into the in-progress profile, and continue full-file generation and validation here.

Validate

Load references/script-usage.md. Load references/validation-rules.md only when explaining specific rule IDs or validation behavior.

Steps:

1. Run bundled script preflight once per session.
2. Locate the file. If the user pastes content, tell them the generated temporary path before writing, ask for confirmation, use an isolated safe temp path, and clean it up after validation unless they ask to keep it. Otherwise use the provided path.
3. Run <PY> scripts/validate_def.py <path> --json and do not reimplement validation in context.
4. Group findings by severity: errors, warnings, then info. For each error, cite rule ID, line number, and macro when available.
5. Always surface footgun warnings, especially HD-W3xx silent-fallback warnings.
6. If clean, confirm the inferred archetype and IP version, then suggest the likely next check or handoff.

Explain / Reason

Load only the reference needed for the question:

Question type	Reference
Macro semantics or legal values	references/macro-reference.md
Validation rule behavior	references/validation-rules.md
Macro-driven port effects	references/top-port-map.md
init_reg[] and N_INIT_REG	references/init-reg-cookbook.md
Advanced macros	references/advanced-macros.md
Example legal configurations	references/archetypes.md

For grounded legality questions, run preflight and prefer validating a concrete file or minimal synthetic file with scripts/validate_def.py over hand reasoning. Cite RTL line ranges from references when explaining why a rule exists.

Compare

Load references/script-usage.md, run preflight, then use <PY> scripts/compare_defs.py <a.svh> <b.svh> [--json|--text]. Summarize semantic differences, not whitespace or comment-only changes.

Limitations

• Do not generate FPGA_top.sv; use hsb-ip-create-top after the defs file validates.
• Do not derive packetizer-only field sets here when the packetizer behavior is underspecified; delegate that slice to hsb-ip-packetizer.
• Do not treat bundled archetypes or corpus metadata as norms. They are examples and maintenance metadata, not defaults.
• Do not silently accept unknown macros as validated HSB IP behavior unless live source or references document them.

Troubleshooting

• Script preflight fails: report the missing Python or PyYAML requirement and stop before generation or validation.
• Validation reports errors: group by severity, cite rule ID and line, and fix the defs file before offering top-level handoff.
• Validation reports HD-W3xx warnings: surface them even when there are no errors because they describe silent RTL fallback risks.
• Unknown macro appears: treat it as project-specific unless live HSB IP source or bundled references document it.

Available Scripts

Use <PY> selected during preflight from references/script-usage.md for every command.

Script	Purpose	Arguments
scripts/generate_def.py	Generate HOLOLINK_def.svh from an archetype and/or YAML/JSON profile; validates before writing	--profile <path>, --archetype <slug>, -o <output>, optional --allow-random-uuid compatibility flag
scripts/validate_def.py	Validate a HOLOLINK_def.svh and emit JSON or text findings	<path/to/HOLOLINK_def.svh>, optional --json or --text, optional --ip-source <root>
scripts/compare_defs.py	Compare two def files semantically, ignoring whitespace/comment-only changes	<a.svh> <b.svh>, optional --json or --text
scripts/build_corpus_metadata.py	Maintenance helper to rebuild anonymized corpus metadata; do not run during normal user workflows	<path1> [<path2> ...]

Bundled Resources

Resource	Use
references/generate-workflow.md	Detailed Generate workflow, requirement order, question style, and per-topic prompt guidance
references/script-usage.md	Preflight, command forms, and run_script() examples for bundled scripts
references/macro-reference.md	Wrapper requirement, macro semantics, legal constraints, and RTL citations
references/validation-rules.md	Rule catalog for validator findings
references/archetypes.md	Illustrative legal configurations; never treat as templates or frequency guidance
references/init-reg-cookbook.md	Boot-time APB write sequence patterns and address conventions
references/top-port-map.md	Macro-to-HOLOLINK_top port effects
references/advanced-macros.md	SYNC_CLK_HIF_APB, SYNC_CLK_HIF_PTP, PERI_RAM_DEPTH, and DISABLE_COE
assets/metadata/corpus.json, assets/metadata/corpus-stats.json	Maintenance metadata only; do not cite corpus counts as user guidance
scripts/generate_def.py	Generate a def file from a profile
scripts/validate_def.py	Validate a def file and emit JSON/text findings
scripts/compare_defs.py	Compare two def files semantically

Examples

• Use hsb-ip-def to generate a HOLOLINK_def.svh for a new HSB board. Treat as Generate, run script preflight, classify supplied requirements, ask one requirement question per turn, and run scripts/generate_def.py only after the profile is confirmed.
• Use hsb-ip-def to validate my existing HOLOLINK_def.svh and tell me whether any warnings are important. Treat as Validate, ask for or locate the file, run scripts/validate_def.py <path> --json, group findings by errors, warnings, and info, and always surface HD-W3xx footgun warnings.
• Use hsb-ip-def to explain whether HOST_WIDTH=512 and PTP_CLK_FREQ=90_000_000 is legal. Treat as Explain / Reason, prefer a concrete validator-backed check over hand reasoning, and load only the macro or validation reference needed to explain the result.