How to Create IP Core in Vivado Using Verilog

To create an IP core in Vivado using Verilog, start by writing your Verilog module, then open Vivado, create a new IP project, and package your module as an IP using the IP packager tool. Finally, generate the output products and use the IP in your designs.

Syntax

Creating an IP core in Vivado involves writing a Verilog module with a clear interface and then packaging it. The basic Verilog module syntax is:

• module: Defines the start of the module.
• port list: Inputs and outputs of the module.
• endmodule: Marks the end of the module.

Vivado requires the module to be synthesizable and have well-defined ports to package it as an IP.

verilog

module my_ip_core(
    input wire clk,
    input wire rst,
    input wire [7:0] data_in,
    output wire [7:0] data_out
);

// Simple pass-through logic
assign data_out = data_in;

endmodule

Example

This example shows a simple Verilog module that can be packaged as an IP core in Vivado. It passes input data to output directly. After writing this code, use Vivado's IP packager to create the IP.

verilog

module simple_pass_through(
    input wire clk,
    input wire rst,
    input wire [7:0] data_in,
    output wire [7:0] data_out
);

assign data_out = data_in;

endmodule

Common Pitfalls

Common mistakes when creating IP cores in Vivado include:

• Not defining all input/output ports clearly, which causes packaging errors.
• Using non-synthesizable constructs like delays or file I/O in the module.
• Forgetting to generate output products after packaging, so the IP cannot be used.
• Not setting the correct clock and reset signals in the module interface.

Always verify your module is synthesizable and test it before packaging.

verilog

/* Wrong: Using non-synthesizable delay */
module bad_ip(
    input wire clk,
    output reg out_signal
);

initial begin
    out_signal = 0;
    #10 out_signal = 1; // Delay not synthesizable
end

endmodule

/* Right: Use synchronous logic instead */
module good_ip(
    input wire clk,
    output reg out_signal
);

always @(posedge clk) begin
    out_signal <= 1'b1;
end

endmodule

Quick Reference

Steps to create an IP core in Vivado with Verilog:

• Write a synthesizable Verilog module with clear ports.
• Open Vivado and create a new project.
• Use the IP Packager tool: Tools > Create and Package IP.
• Choose to package your current project or add your Verilog file.
• Define the IP metadata and ports.
• Generate output products.
• Use the IP in your block design or HDL project.

Key Takeaways

Write a clear, synthesizable Verilog module with defined input/output ports before packaging.

Use Vivado's IP Packager tool to create and configure your IP core.

Avoid non-synthesizable code like delays or initial blocks in your module.

Always generate output products after packaging to use the IP in designs.

Test your Verilog module standalone before packaging it as an IP.