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©2017 Integrated Device Technology, Inc.

June 5, 2017

Introduction

This document provides information on various methods for programming an EEPROM so that the desired settings will be loaded into the 
8T49N24x (8T49N240i, 8T49N241i, or 8T49N242i) device registers at boot-up. 

Overview

The 8T49N24x devices have an option to load their settings from OTP, EEPROM, or both (with EEPROM overriding OTP). The EEPROM 
can easily make changes to the settings that will persist between device power-ups. This guide shows how to program the EEPROM 
using the 8T49N240i, 8T49N241i, or 8T49N242i Evaluation Board; however, the principles apply to designs in general. 

Items needed: 

IDT8T49N240i, IDT8T49N241i, or IDT8T49N242i Evaluation Board with AT24C04 EEPROM installed

1 regular USB cable

Timing Commander™ v1.5.3.1 or later installed on a PC

8T49N24x Timing Commander™ Personality v0.8 or later

If using a Dash-Code or existing configuration file:
1. Copy the configuration file to the Desktop. 

Do not load the original directly from Timing Commander

.

2. Open the file through the initial pop-up window, or by clicking on the part number in the top-left corner of the screen if a previous settings 

file was being used (see the following figures). 

If writing a new configuration:
1. Create a new settings file through the initial pop-up window, or by clicking on the part number in the top-left corner of the screen if a 

previous settings file was being used (see the following figures). 

2. Provide all necessary input/output settings that are required. 

AN-900

Application Note

8T49N24x EEPROM Programming Guide

Summary of Contents for 8T49N24 Series

Page 1: ...8T49N242i Evaluation Board with AT24C04 EEPROM installed 1 regular USB cable Timing Commander v1 5 3 1 or later installed on a PC 8T49N24x Timing Commander Personality v0 8 or later If using a Dash Co...

Page 2: ...lication Note After the settings file is ready the following methods are available to write the settings to the EEPROM Method 1 Direct Write to EEPROM Using Timing Commander and the Evaluation Board M...

Page 3: ...tion Board Before beginning make sure Timing Commander is installed the 8T49N24x personality file is downloaded the 8T59N24i evaluation board is powered and the USB cable is plugged into the evaluatio...

Page 4: ...lication Note 4 Press Write to Connected Chip 5 A successful registers write will return a successful message pop up 6 Verify the device is configured correctly by using single register reads and chec...

Page 5: ...e 9 A successful EEPROM write will return a successful message pop up 10 Press the reset button on the evaluation board see the User s Guide for the board revision being used for the reset button loca...

Page 6: ...d itself does not write to the attached EEPROM The following steps will perform this action 1 Press the EEPROM button on the main window within Timing Commander to show the EEPROM popup window 2 Press...

Page 7: ...ton again 4 The register contents may also be arbitrarily edited and the CRC can then be calculated for the resulting settings Changing the values in this manner will lock the displayed value to whate...

Page 8: ...rite to the attached EEPROM The following steps will perform this action 1 Press the EEPROM button on the main window to show the EEPROM popup window 2 Select the file format Hex Space Separated appea...

Page 9: ...ks of IDT and its subsidiaries in the United States and other countries Other trademarks used herein are the property of IDT or their respective third party owners For datasheet type definitions and a...

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