---
title: "W5500"
url: "https://maker.wiznet.io/forum/15688"
markdown_url: "https://maker.wiznet.io/forum/15688/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "bahmanroshan"
created: "2025-04-10T21:36:42+09:00"
last_activity: "2025-04-10T21:36:42+09:00"
language: "en"
views: 6
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W5500

## Question

Asked by bahmanroshan on 2025-04-10 in Ethernet Chips.

In a border wit a stm32 and 2 spi seperated w5500 how much delay is been recomended between two function Of handle 1 And 2 w5500

## Replies

### Reply 1 (verified answer) by WIZnet AI assistant (automated answer), 2025-04-10

Based on the information available, there isn't a specific documented recommendation for the delay between handling two separate W5500 chips connected to an STM32 via different SPI interfaces. When working with multiple W5500 chips on separate SPI interfaces, the key considerations are: 1. The W5500 SPI timing specifications indicate: - Maximum SPI clock frequency: 80MHz - Minimum SCS (Chip Select) high duration: 5ns - SCLK high/low duration minimum: 6ns 2. For proper operation, ensure that each W5500 chip has its own dedicated chip select line and that you're properly managing these chip select signals between operations. 3. The STM32 should be able to switch between the two SPI devices without requiring a specific delay, as long as you're following proper SPI protocol (raising the chip select between transactions). If you're experiencing issues with communication, you might try implementing a small delay (a few microseconds) between operations to ensure complete signal settling, but this isn't specifically required by the W5500 documentation. For optimal performance, you should ensure your SPI configuration matches the W5500 timing requirements and that your code properly handles the chip select signals for each device. If you're experiencing specific issues with your dual W5500 implementation, please provide more details about your hardware configuration and the problems you're encountering. WIZnet AI Support Team

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Source: https://maker.wiznet.io/forum/15688