---
name: sim-rtl-flow
description: >
  Run the sim-rtl-flow LangGraph workflow at E:\LangGraph_Design\sim-rtl-flow — the
  Simulink-to-RTL-to-hardware design pipeline: Simulink -x principle sim (sim-golden) →
  HUMAN sign-off on simulation performance → optional -q fixed-point → parallel
  functional partition + RTL/SoC interface spec → HUMAN sign-off on the partition →
  per-module -E.slx nativization and Xilinx-IP replacement (parallel Send fanout) →
  Vivado build + timing → hardware-in-the-loop via fpga-imx6-flow or zynq-imx6-flow.
  It drives the compiled graph in-process (no langgraph dev server) and hands every
  subagent task back to THIS Claude session — and every human checkpoint to the USER —
  through a record/replay ledger stored in the design project being worked on.

  ALWAYS use this skill whenever the user wants to run, start, drive, resume or continue
  the sim-rtl-flow workflow / Simulink→RTL design flow, or says things like "启动
  sim-rtl-flow", "跑 sim-rtl-flow", "运行仿真到RTL的设计流程", "执行 sim-rtl-flow 设计任务",
  "继续 sim-rtl-flow", "run the sim to rtl flow", "resume the sim-rtl-flow run", even if
  they don't name the project path. Also use it when the user asks to record a subagent
  result, to approve or reject one of the two human checkpoints, or to rehearse the graph
  with the scripted backend.
---

## What this skill does

Drives the **sim-rtl-flow** graph (21 top-level nodes + a 3-node per-module subgraph,
1:1 with `Notes/PR01-1.md`, `Notes/PR01-2.md` and `Notes/PR01_sim_rtl_flow.drawio`).

The graph contains **no** agent logic — it talks to the outside world through two
protocols: `SubagentBackend` (design work) and `ReviewGate` (the two mandatory human
sign-offs). This skill plugs a **record/replay** implementation into both: the graph
runs in-process until it needs an answer that isn't recorded yet, then stops and prints
the request. **You are the subagent; the USER is the reviewer.** You do the work,
`record` the answer, and `resume` — the driver replays the ledger, deterministically
walks back to where it stopped, and asks for the next thing.

| Item | Value |
|---|---|
| Project root | 见 `~\skills_env.md` 的 `SIM_RTL_FLOW_ROOT`（driver 自动读取，也可 `--project` 覆盖） |
| Conda env | `langgraph` (path 见 `~\skills_env.md` 的 `CONDA_LANGGRAPH_PYTHON`；装环境用 `/langgraph-vivado-install`) |
| Graph | `sim_rtl_flow.graph:build_workflow` (in-process, no `langgraph dev`) |
| Driver | `%USERPROFILE%\.claude\skills\sim-rtl-flow\scripts\run_sim_rtl_flow.py` |
| **Run state** | **`<work_dir>\.sim_rtl_flow\runs\<thread-id>\`** — inside the *design project*, never in the workflow repo |
| Max attempts | 10 per gate (default) |

There is **no LangGraph checkpointer** in the driver, on purpose: graph nodes have no
side effects of their own (all side effects live in the subagents, which are replayed),
so re-invoking from scratch is cheaper and immune to partial-superstep resume semantics.
`ledger.json` *is* the persistence.

**Drive the driver with the Bash tool (Git Bash), not PowerShell** — PowerShell 5.1
mangles the double quotes inside `--result '{...}'` payloads. Every command below was
run this way and verified.

```bash
PY="<CONDA_LANGGRAPH_PYTHON — see ~\skills_env.md>"
RUN="$USERPROFILE/.claude/skills/sim-rtl-flow/scripts/run_sim_rtl_flow.py"
export PYTHONIOENCODING=utf-8
```

The driver resolves the workflow checkout from `SIM_RTL_FLOW_ROOT` in
`~\skills_env.md`, so no path is baked into this skill.

## ⚠️ The two human checkpoints are the user's decision, not yours

The graph stops at two points that **an agent may not decide**:

| checkpoint | where | what the user confirms |
|---|---|---|
| `sim_performance` | after step 1 | the `-x` sim meets the requirement and may be frozen as **sim-golden** |
| `functional_partition` | after step 3 | the pure-sim / RTL / SoC split and the RTL↔SoC interface doc |

When one comes up the driver prints a `!!!` banner. **Relay the question and its context
to the user verbatim, then wait.** Do not approve on your own judgement, do not infer
approval from "the numbers look fine", and do not use `--all-ok` (the driver refuses it
for review keys anyway). A rejection **must** carry the user's reason.

```bash
"$PY" "$RUN" --work-dir <proj> --thread-id <id> record --key review:sim_performance#1 --approve
"$PY" "$RUN" --work-dir <proj> --thread-id <id> record --key review:sim_performance#1 \
  --reject --notes "带外抑制不足 6dB"
```

Rejecting `sim_performance` re-runs step 1; rejecting `functional_partition` re-runs the
whole partition + interface superstep.

## Non-negotiable design rules the graph enforces

From `Notes/PR01.md` and `Notes/PR01-2.md`; the graph routes on these.

1. **sim-golden is the only acceptance criterion.** `-q`, the partition, and every `-E`
   version must match the `-x` sim. If it doesn't, record `gate_passed: false` — never
   record a pass you didn't verify.
2. **One `-E.slx` per RTL submodule**, saved separately (`<project>_A-E.slx`, …). Do not
   nativize all submodules in one Simulink model.
3. **Never hand-edit MATLAB-generated RTL.** If IP replacement, Vivado timing, or HIL
   needs a change there, return `change_scope: "simulink_module"` + `affected_modules`.
   The graph then forces `modify_e:* → sync_sim:*` before any RTL is regenerated.
4. **Editing a `-E` model obliges you to sync the `-x`/`-q` model.** `modify_e:*` edits
   only the `-E`; the follow-up `sync_sim:*` uses **`simulink-rtl-redev`** to carry the
   same change into the simulation model and re-verify against sim-golden. The
   derivation script does *not* translate native-core edits into the m implementation,
   so changing one side alone means the RTL moved while the simulation still validates
   the old behaviour. If they don't align, the graph goes back to `modify_e:*` — it will
   **not** let you regenerate RTL.
5. **Timing fixes change the RTL, not the constraints.** Prefer adding pipeline/delay
   stages. Only touch timing constraints when the constraint itself is plainly wrong,
   and say why in `notes`.
6. **HIL is strictly read-only.** `hil:*` arrives with `allow_code_changes=false`. Run
   `fpga-imx6-flow` / `zynq-imx6-flow` for *diagnosis only*; the moment a code change is
   needed, stop that sub-flow and report it back here — the fix happens in the
   sim-rtl-flow main graph, then re-enters Vivado and HIL.

## Run (agent path)

### 1. Write the workflow input

`work_dir` is the design project. **All run state goes under
`<work_dir>/.sim_rtl_flow/`** — that is where `resume`/`record`/`status` will look.

```bash
cat > /c/Users/Administrator/AppData/Local/Temp/claude/input.json <<'EOF'
{
  "requirements_path": "Notes/requirements.md",
  "work_dir": "E:/Xilinx_design/my_project",
  "project_name": "demo",
  "device_family": "fpga-imx6",
  "fixed_point_required": true,
  "rtl_modules": ["A", "B", "C"],
  "soc_modules": ["control"]
}
EOF
```

| field | meaning |
|---|---|
| `requirements_path` | user's requirement `.md`, relative to `work_dir` |
| `work_dir` | the design project — **absolute path**; also where run state is written |
| `project_name` | artifact prefix — `<name>-x.slx`, `<name>_A-E.slx`, `<name>.bit` |
| `device_family` | `fpga-imx6` → HIL via `fpga-imx6-flow`; `zynq-imx6` → `zynq-imx6-flow`. Anything else raises at `initialize`. |
| `fixed_point_required` | `false` skips the `-q` stage |
| `rtl_modules` | submodule names; each gets its own parallel `native → ip_replace` chain. Non-empty. |
| `soc_modules` | MCU/SoC-side modules (interface-spec input) |

### 2. Start — exits 10 with a handoff

```bash
"$PY" "$RUN" --thread-id my-design-001 start --input /c/Users/Administrator/AppData/Local/Temp/claude/input.json
```

`start` takes `work_dir` from the input JSON and prints where state landed. Verified:

```
work dir : E:\Xilinx_design\my_project
run dir  : E:\Xilinx_design\my_project\.sim_rtl_flow\runs\my-design-001
========================================================================
HANDOFF — 1 subagent task(s), 0 human review(s)
========================================================================
--- key: simulink_x#1
    role        : simulink-principle-agent
    permission  : WRITE ALLOWED
    prompt      : 根据需求文档创建或修订 Simulink -x 原理仿真；...
```

Exit codes: **10** = handoff pending, **0** = completed, **1** = `failed`, **2** = crash.

### 3. Answer, then resume

Every later command needs to find the run, so pass `--work-dir` (or `cd` into it):

```bash
W="--work-dir E:/Xilinx_design/my_project --thread-id my-design-001"
"$PY" "$RUN" $W record --key simulink_x#1 \
  --result '{"gate_passed": true, "artifacts": ["demo-x.slx"], "notes": "EVM -38dB"}'
"$PY" "$RUN" $W resume
```

Loop until `WORKFLOW FINISHED — status: completed`. When several keys are pending,
record **each**, then `resume` once. `record --all-ok` fast-forwards pending *subagent*
keys with a default success — rehearsal only, and it refuses review keys.

### 4. What you get handed

| key | what you actually do | which skill to use |
|---|---|---|
| `simulink_x#n` | build/revise the `-x` sim, document the performance envelope | MATLAB MCP + `model-based-design-core:building-simulink-models`, `simulating-simulink-models` |
| `review:sim_performance#n` | **ask the user** to sign off on sim-golden | — (relay to user) |
| `fixed_point#n` | `-q` fixed-point, compare to `-x` | same MATLAB skills |
| `partition#n` | pure-sim / RTL / SoC split, must not degrade sim-golden | same |
| `interfaces#n` | RTL↔SoC interface doc — register-config or data-stream only | write the doc under `work_dir` |
| `review:functional_partition#n` | **ask the user** to sign off on the split + interfaces | — (relay to user) |
| `module_plan#n` | split the RTL side into A/B/C…, give order + dependencies (**first pass only**) | inline |
| `native:<M>#n` | nativize M into HDL-capable blocks, save `<project>_M-E.slx`, generate RTL | `simulink_rtl_dev` |
| `ip_replace:<M>#n` | swap in Xilinx IP, cycle-true compare vs MATLAB RTL | `rtl-ip-replace` |
| `modify_e:module#n` / `modify_e:vivado#n` / `modify_e:hil#n` | edit **only** the named `-E.slx` (cycle-true / timing / HIL driven) | `simulink_rtl_dev` |
| `sync_sim:<source>#n` | carry that `-E` change into the matching `-x`/`-q` model and re-verify alignment | **`simulink-rtl-redev`** |
| `vivado#n` | build the Vivado project, synth+impl+bitstream, check all timing | `vivado-prj-create`, `vivado-mcp` |
| `hil:fpga-imx6-flow#n` / `hil:zynq-imx6-flow#n` | HIL debug, **read-only** | `fpga-imx6-flow` / `zynq-imx6-flow` |
| `timing_rework#n` | fix non-Simulink RTL / SoC / project timing | inline |
| `hil_rework#n` | apply the code change HIL asked for | inline |

`#n` is the n-th time that key has been requested this run — retries and rework produce
`#2`, `#3`, …

### 5. Answer JSON

`"$PY" "$RUN" schema` prints both templates. All fields optional except `approved`.

```json
subagent: {"success": true, "gate_passed": true, "artifacts": [], "notes": "",
           "timing_met": true, "hil_passed": true, "needs_code_change": false,
           "change_scope": "none", "affected_modules": [], "metadata": {}}
review:   {"approved": true, "notes": "", "metadata": {}}
```

| field | who reads it |
|---|---|
| `success` + `gate_passed` | every design node — `false` → retry, then `failed` after 10 attempts |
| `artifacts` | `simulink_x`'s first artifact **becomes sim-golden**; `vivado`'s go to HIL as the bitstream |
| `timing_met` | `vivado` only |
| `hil_passed` | `hil:*` only |
| `needs_code_change` + `change_scope` + `affected_modules` | `vivado` and `hil:*` — the rework router |

Routing on `change_scope`:

- `simulink_module` → **`modify_e:*`** (edit the `-E.slx`) → **`sync_sim:*`** (carry it
  into `-x`/`-q`, re-verify) → only the affected modules re-run `native → ip_replace` →
  Vivado → HIL.
- `non_simulink_rtl` / `soc` / `hardware` → `timing_rework` (from Vivado) or `hil_rework`
  (from HIL) → Vivado.
- The driver **rejects** `needs_code_change: true` with `change_scope: "none"`.

A failing `ip_replace:<M>` (cycle-true mismatch) enters the same chain on its own:
`evaluate_modules → modify_e:module → sync_sim:module → native:<M>`. A failing
`native:<M>` does **not** — the `-E` isn't sound yet, so it just re-runs nativization.

### 6. Parallel batches (verified)

| stage | keys handed over at once |
|---|---|
| after `-x` / `-q` | `interfaces#1` **and** `partition#1` |
| module fanout | one `native:<M>#1` per module (3 for `["A","B","C"]`) |
| next module stage | one `ip_replace:<M>#1` per module |

Work batched tasks in any order; record all, then `resume`.

## Rehearsal without touching hardware

```bash
"$PY" "$RUN" dry-run --input examples/happy_path.json
```

Runs the whole graph against `ScriptedBackend` + auto-approving `ScriptedReviewGate` —
no handoffs, no side effects. Verified: `status: completed`, 13 subagent calls listed
with their skill and write permission, plus both review checkpoints. To rehearse a
branch, add `outcomes` (task → list of results) and/or `reviews` (checkpoint → list of
decisions) to the input JSON; `start`/`resume` strip both.

```json
"outcomes": {"hil:fpga-imx6-flow": [
   {"success": true, "hil_passed": false, "needs_code_change": true,
    "change_scope": "simulink_module", "affected_modules": ["A"]},
   {"success": true, "hil_passed": true}]},
"reviews": {"sim_performance": [{"approved": false, "notes": "EVM 未达标"}]}
```

## Other commands

```bash
"$PY" "$RUN" $W status                # ledger + pending + final status
"$PY" "$RUN" schema                   # both answer templates
"$PY" "$RUN" mermaid                  # graph as Mermaid (see gotcha)
"$PY" -m unittest discover -s tests   # project's own 16 tests — all pass
```

Global flags go **before** the subcommand: `--project`, `--work-dir`, `--thread-id`,
`--recursion-limit` (200), `--max-attempts` (10).

## Gotchas

- **`resume`/`record`/`status` need `--work-dir`** (or a `cd` into the design project).
  Only `start` can infer it, from the input JSON. Without it the driver looks in the cwd
  and reports `no input.json in …`.
- **The driver refuses a `work_dir` inside the sim-rtl-flow repo.** Run state belongs to
  the design project (PR01-2). `examples/happy_path.json` therefore carries a placeholder
  `E:/Xilinx_design/your_project` — fine for `dry-run`, but replace it before `start`.
- **`mermaid` output is still partly misleading.** The forward and rework edges now
  render (path maps were added), but `plan_modules`' `Send` fanout is a dynamic edge
  Mermaid can't show. Use `Notes/Result00.md` for the authoritative picture.
- **`--max-attempts` must precede the subcommand** and stay the *same value* across
  `start` and every `resume` — it is runtime context, not persisted state.
- **The skill names the graph hands you are real and exact** — `simulink_rtl_dev`
  (**underscores**, not dashes), `rtl-ip-replace`, `simulink-rtl-redev`. All three are
  installed. Invoke the named one rather than improvising with MATLAB MCP directly: they
  carry the project's own gates (`audit_hdl_blocks.m`, cycle-true compare, `check_sync.py`).
- **`sync_sim:*` is not optional bookkeeping.** It is the step that keeps the `-x`/`-q`
  model telling the truth about the `-E` you just changed. Recording it as passed without
  actually re-simulating means every later gate — Vivado, HIL, sim-golden — is validating
  a model that no longer matches the RTL.
- **`simulink_x`'s first artifact silently becomes sim-golden.** Record `artifacts: []`
  and the graph substitutes `<project_name>-x.slx`. Always record the real filename.
- **`module_plan` runs only on the first pass.** Rework rounds reuse the plan, so you
  will not be asked to re-partition the module list mid-run.
- **Re-recording a key requires editing `ledger.json` by hand.** `record` only accepts
  currently-pending keys; anything already in the ledger is replayed forever. To redo a
  step, delete its entry *and everything after it*, then `resume`.
- **Runs created before the PR01-2 change live in the old location**
  (`<SIM_RTL_FLOW_ROOT>\runs\<id>\`) and their ledgers have no `review:*` or
  `module_plan` keys, so they cannot be resumed under the current graph. Start a fresh
  thread instead.
- **`work_dir` is passed straight through to every subagent request.** Forward slashes
  are fine on Windows; a relative `"."` resolves against wherever the driver was
  launched — always use an absolute path.
- **`start` wipes the ledger** unless `--keep-ledger`. Use a fresh `--thread-id` per run.

## Troubleshooting

| symptom | cause / fix |
|---|---|
| `sim_rtl_flow package not found under …\src` | `SIM_RTL_FLOW_ROOT` in `~\skills_env.md` is wrong/missing; fix it or pass `--project <检出目录>` |
| `sim-rtl-flow 工作流仓库路径未配置` | add `SIM_RTL_FLOW_ROOT = <检出目录>` to `~\skills_env.md` |
| `no input.json in …\.sim_rtl_flow\runs\<id>` | missing/incorrect `--work-dir`, or `start` was never run |
| `nothing pending — run 'start' or 'resume' first` | the previous invoke completed or crashed; check `status` |
| `--key X is not pending; pending = [...]` | typo, or already recorded (see the re-record gotcha) |
| `--all-ok 不能用于人工审核断点` | working as intended — the user must decide; use `--approve` / `--reject` |
| `驳回必须写明理由：请提供 notes` | add `--notes "<user's reason>"` |
| `unknown review fields: ['gate_passed']` | you sent a subagent result to a `review:*` key; use `--approve`/`--reject` |
| `needs_code_change=true requires an explicit change_scope` | add `change_scope` |
| `MissingReviewGateError` | only if the graph is driven without a review gate — the driver always supplies one |
| `device_family must be 'fpga-imx6' or 'zynq-imx6'` | raised in `initialize`; exit 2 |
| exit 2 + `recursion_limit` | a rework loop isn't converging — raise `--recursion-limit`, or stop recording `needs_code_change` for the same module |
| mojibake in the Chinese prompts | `export PYTHONIOENCODING=utf-8` |