What is ip_reference?

A reference library of ready-made Verilog implementations for common digital hardware modules. Verilog is a language used to describe electronic circuits, and each listed module includes a matching testbench template.

Use it when implementing modules such as arbiters, FIFOs, edge detectors, synchronizers, priority encoders, or counters. Look up the matching Verilog file and testbench, adapt the parameters, then verify it in the Foundry sandbox.

It reduces the need to design standard hardware building blocks from the beginning. The reference implementations and testbenches provide a starting point for compiling and simulating them.

ip_reference — Skill for Claude Code and Codex by ic-star-tech

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add ic-star-tech/ccfoundry-agent-kit --skill ip_reference

Clone the repo

git clone --depth 1 https://github.com/ic-star-tech/ccfoundry-agent-kit

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference/github.svg)](https://agentmods.dev/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference)

Your own site

<a href="https://agentmods.dev/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference"><img src="https://agentmods.dev/badge/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference"><img src="https://agentmods.dev/badge/skills/ic-star-tech/ccfoundry-agent-kit/ip_reference.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 705 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00015	$0.00705
Opus 5.5	$0.00006	$0.00282
Sonnet 5.5	$0.00003	$0.00141
Haiku 4.5	$0.00002	$0.00071

Measured 2mo ago against content hash 5183a9443690, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ip_reference scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

examples/verilog_module_writer/agent_space/skills/ip_reference/SKILL.md · 79 lines

How it starts

The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.

IP Reference Portfolio

Trigger

Use this skill when implementing standard digital modules. Look up the reference code from the references/ subdirectory instead of writing from scratch.

How to Use

Check the portfolio table below to find a matching module
Read the .v file from references/<module>/ for the implementation
Read the _tb.v file for the testbench template
Adapt parameters as needed by the task spec
Compile and simulate in the Foundry sandbox

File locations (relative to this skill directory):

references/
├── rra/             # Round Robin Arbiter
│   ├── rra.v
│   └── rra_tb.v
├── sync_fifo/       # Synchronous FIFO
│   ├── sync_fifo.v
│   └── sync_fifo_tb.v
├── edge_detect/     # Edge Detector
│   ├── edge_detect.v
│   └── edge_detect_tb.v
├── priority_enc/    # Priority Encoder
│   ├── priority_enc.v
│   └── priority_enc_tb.v
├── pulse_sync/      # Pulse Synchronizer (CDC)
│   ├── pulse_sync.v
│   └── pulse_sync_tb.v
└── counter/         # Up/Down Counter
    ├── counter.v
    └── counter_tb.v

IP Portfolio

Module	Category	Params	Description	Verified
rra	Arbitration	N=4	Mask-based Round Robin Arbiter, one-hot grant	✅ iverilog
sync_fifo	Memory	DATA_W=8, DEPTH=4	Synchronous FIFO with full/empty/count	✅ iverilog
edge_detect	Utility	—	Rising/falling/both edge detector	✅ iverilog
priority_enc	Logic	N=8	Parameterized priority encoder with valid flag	✅ iverilog
pulse_sync	CDC	—	Single-pulse clock domain crossing (3-stage sync)	✅ iverilog
counter	Utility	WIDTH=8	Up/down counter with load, overflow/underflow	✅ iverilog

Design Conventions

All reference IPs follow the coding_style skill guidelines:

Verilog-2001, ANSI port declarations
Async active-low reset (rst_n)
always @(*) for combinational, always @(posedge clk or negedge rst_n) for sequential
Self-checking testbenches with PASS/FAIL and ALL_TESTS_PASSED summary
$dumpfile / $dumpvars for waveform capture

Read the full file on GitHub · 79 lines

Files

What ships with it

13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 79 lines · 15 tokens per session scan A 5183a9443690

Subscribe to this mod's changes

ip_reference is a skill published in the GitHub repository ic-star-tech/ccfoundry-agent-kit (24 stars, last pushed 5mo ago), licensed MIT. It adds 15 tokens to every session and 705 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Hardware and IoT

ip_reference next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ip_referenceic-star-tech/ccfoundry-agent-kit	Skill	24	5mo ago	MIT	A	15	Claude Code, Codex
gke-compute-classesgoogle/skills	Skill	22k	yesterday	Apache-2.0	A	83	Claude Code, Codex
jetson-diagnosticNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	A	30	Claude Code, Codex
holoscan-install-wheelNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	A	34	Claude Code, Codex
offensive-z-waveSnailSploit/Claude-Red	Skill	10k	25d ago	MIT	A	113	Claude Code, Codex
doca-socket-relayNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	A	236	Claude Code, Codex
hsb-flashNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	B	94	Claude Code