AN 922: Using the ECO Compilation Flow

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ID 683873
Date 3/31/2022
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Document Table of Contents x
1. AN 922: Using the ECO Compilation Flow
1. AN 922: Using the ECO Compilation Flow x
1.1. Step 1: Open the Design Example Project 1.2. Step 2: Run the ECO Flow 1.3. Step 3: Implement Targeted ECOs 1.4. ECO Tcl Script Example 1.5. ECO Command Limitations 1.6. Document Revision History for AN 922: Using the ECO Compilation Flow
1.3. Step 3: Implement Targeted ECOs x
1.3.1. Modify the Lutmask 1.3.2. Change Routing Connections 1.3.3. Tie Off Input Port to GND 1.3.4. Modify Slew Rate, Current Strength, and Delay Chain 1.3.5. Place A Node in a New Location 1.3.6. Create a Wire LUT Atom
1.3.6. Create a Wire LUT Atom x
1.3.6.1. Running Incremental Flow with Signal Probe
1. AN 922: Using the ECO Compilation Flow

1.2. Step 2: Run the ECO Flow

The following steps describe how to setup, run, and view the results for any ECO command:
  1. Determine if ECO commands support a change you want to make in a compiled design, by reviewing the "ECO Command Quick Reference" table and ECO Command Limitations.
  2. Create a Tcl script that calls the ECO command, as ECO Tcl Script Example shows. The design example includes six eco_demo_<n>.tcl files for use with this example.
  3. To run a full compilation, click Processing > Start Compilation. ECO commands allow you make targeted changes even after a full compilation is complete. Close the Timing Analyzer that opens when full compilation is complete.
  4. To run ECO commands, click Processing > Start > Perform ECO Compilation.
    Figure 2. Perform ECO Compilation
  5. Specify a Tcl Script to implement one or more ECOs, as Step 3: Implement Targeted ECOs describes.
  6. View the ECO results in post-fit analysis tools, such as the Compilation Report, Timing Analyzer, Netlist Viewer, or Chip Planner. To view ECO changes in the Fitter report, click Processing > Compilation Report > Fitter > ECO Changes.
    Figure 3. Example of ECO Changes Report
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