---
title: "W6100 EVB has a bug!!!"
url: "https://maker.wiznet.io/forum/14287"
markdown_url: "https://maker.wiznet.io/forum/14287/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "gagaqq11"
created: "2021-07-08T01:33:01+09:00"
last_activity: "2021-07-08T01:33:01+09:00"
language: "en"
views: 444
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W6100 EVB has a bug!!!

## Question

Asked by gagaqq11 on 2021-07-08 in Ethernet Chips.

Hi,
I change SW1 in w6100 EVB to 0b10, because I want to access w6100 by parallel bus。And _WIZCHIP_IO_MODE has been set *WIZCHIP_IO_MODE_BUS_INDIR*. But no registers can be write or read by parallel bus.
So, what can I do to solve this problem.

---

Source: https://maker.wiznet.io/forum/14287