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# Extraction Rules Generation Flow for OpenRCX
This flow generates the RC tech file for OpenRCX. The RC tech file provides
resistance and capacitance tables used for RC extraction for a specific process
corner.
# The flow involves:
A. Running OpenRCX `generate_patterns.tcl` to generate layout patterns.
- Input: tech LEF
- Output: `patterns.def`, `patterns.v`
- Script: `generate_patterns.tcl`
- Desc: OpenRCX generates many pattern geometries to model various types
of capacitance and resistance (i.e., multi-conductor) geometric configurations.
B. Running your favorite extraction tool (i.e., reference extractor) to extract
parasitics of the layout patterns.
- Input: `patterns.def`, `patterns.v` (if required), and additional files
required by the reference extractor.
- Output: `patterns.spef`
- Script: Not provided
- Desc: Extract parasitics of the patterns generated by OpenRCX using a reference
extractor. This one-time step provides the parasitics of various types of pattern
geometries as reference for fitted per-unit length R, C calculation.
C. Running OpenRCX to convert `patterns.spef` to RC tech file.
- Input: `patterns.spef`
- Output: RC tech file
- Script: `generate_rules.tcl`
- Desc: OpenRCX takes the `.spef` from the reference extractor and performs
calculations to produce capacitance and resistance tables for a wide range of
wire geometries. The output of this flow is a custom RC tech file for
OpenRCX.
D. Benchmarking - test the accuracy of OpenRCX on the patterns layout.
- Input: `patterns.def` and RC tech file
- Output: `rcx.spef`, `diff_spef.out`
- Script: `ext_patterns.tcl`
- Desc: Perform parasitic extraction on pattern layout for the calibration
using the generated RC tech file. OpenRCX then compares the extracted
parasitics with the golden parasitics that had been extracted by the reference extractor
in Step (B) above.
## How to run:
1. Go to OpenRCX home directory (`./OpenROAD/src/rcx`).
2. Navigate to calibration folder `cd calibration`
3. Modify the `user_env.tcl` script in the script directory.
- TECH_LEF: points to the directory of the tech LEF
- PROCESS_NODE: the technology node
- extRules: the name and the location of the OpenRCX tech file
4. Run the executable script `run.sh` --> run Steps (A) through (D) of the flow above.
- `source run.sh` or `./run.sh`
5. The OpenRCX RC tech file can be found in the directory that is specified in the extRules variable.
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