Adding Custom Logic to HW Core

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About

• Author: Andy Schmidt
• Last Modified: 07/11/2008
• Notes: This tutorial explains how to add custom HDL logic to your hardware core as a separate component (entity) not directly into the user_logic.vhd.

Getting Started

I assume you have already created a hardware core (probably using Create / Import IP Wizard) in XPS and have some custom logic / entity you want to add to it in a separate file.

This tutorial aims to show you how to do it so XPS will recognize the file. I also assume you know how to hookup and instantiate your component.

This tutorial Assumes You Already:

1. Created a hardware core (Create / Import IP Wizard in EDK)
   • Assume the core is named: test_core_v1_00_a
2. Created custom logic / component as a separate VHDL file
   • Assume the file is name: custom_logic.vhd

Modifying Hardware Core

In your project directory under the pcores directory you will see your test_core directory.

Within this directory you will likely see a couple of directories: data and hdl

1. Copy your custom_logic.vhd file to the pcores/test_core/hdl/vhdl/custom_logic.vhd directory
2. Change directories to the pcores/test_core/data directory
3. Modify the test_core.pao file.
   • The PAO File is the Peripheral Analysis Order which specifies which order the HDL files should be analyzed / compiled in
4. Add the Line above the user_logic vhdl line:
   • lib test_core_v1_00_a custom_logic vhdl

The bottomo of your PAO file should look like this:

lib test_core_v1_00_a custom_logic vhdl
lib test_core_v1_00_a user_logic vhdl
lib test_core_v1_00_a test_core vhdl

To explain what that line means:

• lib just means Library
• test_core_v1_00_a is the official name of the hardware core
• custom_logic is the name of the HDL file
• vhdl specifies that the particular file is a VHDL file (and is in the /hdl/vhdl) directory

Save the PAO file and you are done.

Now you just have to instantiate and use your new custom logic entity or component in the user_logic.vhd file.