| // SPDX-License-Identifier: BSD-3-Clause |
| // Copyright (c) 2024-2025, The OpenROAD Authors |
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| # Author: Dimitris K. Fotakis |
| # Version: v1.0 |
| # Date: 11/05/2024 |
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| Documentation of output file: diff_spef.out |
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| This file is to provide documentation on the format of diff_spef.out file which is generated when running command: |
| diff_spef |
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| Note: C++ function is in file extSpefIn.cpp: extSpef::printDiff |
| this is meant to provide imprtant stats, one line per net per type of R and C total values. |
| by running (grep netRes diff_spef.out | sort) it is easy to gauge range of %error (positive to negative) andby doing <awk> specific columns you can focus on insigts on error (big nets, nets with many vias, etc) |
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| here is the description of the coluns: |
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| column 1: % diff of db value wrt to ref value (which is parsed from the file in the diff_spef command) |
| column 2: db_value |
| column 3: D |
| column 4: [OK,HI,LO] depending on db_value being withing the range of bounds [lo,hi], greater than hi bound, lower than lo bound; bound values are in columns right after keyword: bounds: |
| column 5: % difference of db_value wrt hi value of bounds |
| column 6: ref |
| column 7: ref_value which is the value parsed from the file in command diff_spef |
| column 8: R |
| column 9: [OK,HI,LO] depending on ref_value being withing the range of bounds [lo,hi], greater than hi bound, lower than lo bound; bound values are in columns right after keyword: bounds: |
| column 10: % difference of ref_value wrt hi value of bounds |
| column 11: bounds: |
| column 12: lo_bound |
| column 13: hi_bound |
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| if column 22 == netRes |
| column 14: VR |
| column 15: total_via_res |
| column 16: V |
| column 17: total_via_cnt |
| column 18: L |
| column 19: net_wire_length |
| column 20: WC |
| column 21: Wire (segment) Count (per DEF) |
| column 22: [netRes] for (total net resistance) |
| column 23: corner |
| column 24: corner_index |
| column 25: comma list with total_wire_length on every metal |
| column 26: net_id |
| column 27: net_name |
| else |
| column 14: L |
| column 15: net_wire_length |
| column 16: WC |
| column 17: Wire (segment) Count (per DEF) |
| column 18: V |
| column 19: total_via_cnt |
| column 22: [netCap,gndNetCap,netCcap] for (total net capacitance, total ground capacitance, total coupling capacitance) |
| column 23: corner |
| column 24: corner_index |
| column 25: comma list with total_wire_length on every metal |
| column 26: net_id |
| column 27: net_name |
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