---
title: "W7500 DUP pin MII interface"
url: "https://maker.wiznet.io/forum/14056"
markdown_url: "https://maker.wiznet.io/forum/14056/md"
type: "Forum topic"
category: "MCU & Boards"
author: "8milan8"
created: "2020-11-01T13:25:27+09:00"
last_activity: "2020-11-01T13:25:27+09:00"
language: "en"
views: 447
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W7500 DUP pin MII interface

## Question

Asked by 8milan8 on 2020-11-01 in MCU & Boards.

Hi,

I searched description of this pin (DUP) in datasheet and reference manual, but I found nothing. From example schematic I found that this should be a pin for detection full-duplex/halp-duplex link state. It is so?

I like connect KSZ8863MLL with W7500, but don’t have a pin on this IC which would have this functionality. What happens if this pin (DUP) stays unconnected?

Thanks!

---

Source: https://maker.wiznet.io/forum/14056