---
title: Fix Quartus Prime 23.1 Fatal Error When Creating ALTPLL IP
description: "In Quartus Prime Standard Edition v23.1, a **fatal error** occurs when attempting to create an **ALTPLL IP** using the MegaWizard Plug-In Manager. This is a known bug in v23.1 that affects GeMRTOS Nios V FPGA design flows relying on PLL…"
url: "https://rcayssials.hopto.org/gemrtosdocs/why-do-i-get-a-fatal-error-when-creating-an-altpll-ip/"
updated: "2026-06-01"
category: General
tags:
  - Avalon MM
  - GeMRTOS
  - Nios 2
  - Nios V
  - "RISC-V"
---

# Fix Quartus Prime 23.1 Fatal Error When Creating ALTPLL IP

In Quartus Prime Standard Edition v23.1, a **fatal error** occurs when attempting to create an **ALTPLL IP** using the MegaWizard Plug-In Manager. This is a known bug in v23.1 that affects GeMRTOS Nios V FPGA design flows relying on PLL IP generation. Intel has released a patch to resolve it.

## Issue Description

Due to a problem in the Quartus® Standard Edition Software version 23.1, you might see a fatal error when creating an ALTPLL IP using the MegaWizard Plug-In Manager. This issue is scheduled to be fixed in a future release of the Quartus® Prime Standard Edition Software.

## How to Fix It

Download and install the patch for Quartus® Prime Standard Edition Software version 23.1. Patches are available for both Windows and Linux:

- [Quartus® Prime Standard Edition Software v23.1 Patch 0.02std for Windows (.exe)](https://www.intel.com/content/dam/support/us/en/programmable/kdb/2024/tools/quartus-23.1std-0.02std-windows.exe)
- [Quartus® Prime Standard Edition Software v23.1 Patch 0.02std for Linux (.run)](https://www.intel.com/content/dam/support/us/en/programmable/kdb/2024/tools/quartus-23.1std-0.02std-linux.run)
- [Readme for Quartus® Prime Standard Edition Software v23.1 Patch 0.02std (.txt)](https://www.intel.com/content/dam/support/us/en/programmable/kdb/2024/tools/quartus-23.1std-0.02std-readme.txt)

## Key Takeaways

- This fatal error affects **Quartus Prime Standard Edition v23.1 only** — earlier and later versions are not affected.
- The fix is a patch installer (0.02std) available for both Windows (.exe) and Linux (.run) — no full reinstallation needed.
- After applying the patch, ALTPLL IP creation via MegaWizard proceeds normally in your GeMRTOS Nios V FPGA design flow.

**Source:** Intel Support, [Article 000098457](https://www.intel.com/content/www/us/en/support/programmable/articles/000098457.html).