39 lines
2.5 KiB
Markdown
39 lines
2.5 KiB
Markdown
# Inire Routing Examples
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This directory contains examples demonstrating the features and architectural capabilities of the `inire` router.
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## Architectural Visualization
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In all plots generated by `inire`, we distinguish between the search-time geometry and the final "actual" geometry:
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* **Dashed Lines & Translucent Fill**: The **Collision Proxy** used during the A* search (e.g., `clipped_bbox` or `bbox`). This represents the conservative envelope the router used to guarantee clearance.
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* **Solid Lines**: The **Actual Geometry** (high-fidelity arcs). This is the exact shape that will be used for PDK generation and fabrication.
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---
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## 1. Fan-Out (Negotiated Congestion)
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Demonstrates the Negotiated Congestion algorithm handling multiple intersecting nets. The router iteratively increases penalties for overlaps until a collision-free solution is found. This example shows a bundle of nets fanning out through a narrow bottleneck.
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## 2. Bend Geometry Models
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`inire` supports multiple collision models for bends, allowing a trade-off between search speed and geometric accuracy:
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* **Arc**: High-fidelity geometry (Highest accuracy).
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* **BBox**: Simple axis-aligned bounding box (Fastest search).
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* **Custom Manhattan Geometry**: A custom 90-degree bend polygon with the same width as the normal waveguide.
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Example 06 uses the Manhattan polygon as both the true routed bend geometry and the collision proxy.
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Example 08 compares the standard arc against a run that uses a custom physical bend plus a separate custom proxy polygon, with each net routed in its own session.
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## 3. Unroutable Nets & Best-Effort Display
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When a net is physically blocked or exceeds the node limit, the router returns the "best-effort" partial path—the path that reached the point closest to the target according to the heuristic. This is critical for debugging design constraints.
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## 4. Orientation Stress Test
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Demonstrates the router's ability to handle complex orientation requirements, including U-turns, 90-degree flips, and loops.
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## 5. Tiered Fidelity
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The current implementation can use a cheaper bend proxy on the first negotiated-congestion pass before later passes fall back to the configured bend model. This is controlled by `RoutingOptions.congestion.use_tiered_strategy` together with the bend collision settings described in `DOCS.md`.
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