---
title: "Does the W5500 require a hardware reset?"
url: "https://maker.wiznet.io/forum/10541"
markdown_url: "https://maker.wiznet.io/forum/10541/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "peterjak"
created: "2014-09-23T02:07:03+09:00"
last_activity: "2017-05-04T08:33:54+09:00"
language: "en"
views: 6718
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Does the W5500 require a hardware reset?

## Question

Asked by peterjak on 2014-09-23 in Ethernet Chips.

I’m looking at ignoring the RSTN signal if it is not really required to simplify some interfaces so the question is, if I do not use this pin and rely on POR then does the W5500 still respond to software reset via SPI? Is this reliable?

## Replies

### Reply 1 by peterjak, 2014-09-23

That’s okay, but page 44 of the datasheet PHY configuration infers that this is the case when it says
“When W5500 is reset by POR or RSTn PIN,” . So maybe that needs to be changed to “When W5500 is reset by RSTn PIN”.

Also in the same section “After POR or RSTn reset,” needs to be fixed.

So that line can’t be floated, is that right? Yet section 5.3 states
“RPU – Pull-up Resistor – SCSn, RSTn, PMODE[2:0] – 62 – 77 – 112 Kohm”

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Source: https://maker.wiznet.io/forum/10541