Cypress Perform

Home > Design Support > Cypress Developer CommunityTM > Cypress Forums > USB Controllers > reprogram EZ-USB EEPROM content

Bookmark and Share
Cypress Developer CommunityTM
Forums | Videos | Blogs | Training | Rewards Program | Community Components



reprogram EZ-USB EEPROM content
Moderator:
RSKV

Post Reply
Follow this topic



reprogram EZ-USB EEPROM content

mauricehaelg posted on 18 Jun 2009 7:22 AM PST
Member
3 Forum Posts
Hello,


I recently programmed a FX2 EZ-USB EEPROM with a firmware that had some warnings, mainly linking problems. Now the device is not recognized anymore by the computer; "unknown device".

In that case, how can I reprogram the EEPROM with an old working firmware?

thank you


Re: reprogram EZ-USB EEPROM content

aasi posted on 18 Jun 2009 11:16 AM PST
Cypress Employee
1090 Forum Posts
Disable the EEPROM connect the device and then enable the eeprom and program it...

Re: reprogram EZ-USB EEPROM content

mauricehaelg posted on 19 Jun 2009 12:02 AM PST
Member
3 Forum Posts
But how can I disable the EEPROM if the device isn't even recognized by the computer?

Re: reprogram EZ-USB EEPROM content

aasi posted on 19 Jun 2009 02:51 AM PST
Cypress Employee
1090 Forum Posts
in the dvk they have switches to disable the EEPROM (hardware disabling)... are you using a custom board with no jumper or switch to disconnect the EEPROM from the i2c line????

Re: reprogram EZ-USB EEPROM content

mauricehaelg posted on 19 Jun 2009 02:58 AM PST
Member
3 Forum Posts
I am afraid, yes

Re: reprogram EZ-USB EEPROM content

aasi posted on 19 Jun 2009 05:56 AM PST
Cypress Employee
1090 Forum Posts
FX2LP if it finds a valid first byte it will load the EEPROM image... to stop that you'll have to take care that the EEPROM and FX2LP do not communicate during boot-up.... either remove the EEPROM from the line or manipulate the EEPROMs power or address lines....




ALL CONTENT AND MATERIALS ON THIS SITE ARE PROVIDED "AS IS". CYPRESS SEMICONDUCTOR AND ITS RESPECTIVE SUPPLIERS MAKE NO REPRESENTATIONS ABOUT THE SUITABILITY OF THESE MATERIALS FOR ANY PURPOSE AND DISCLAIM ALL WARRANTIES AND CONDITIONS WITH REGARD TO THESE MATERIALS, INCLUDING BUT NOT LIMITED TO, ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHT. NO LICENSE, EITHER EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, IS GRANTED BY CYPRESS SEMICONDUCTOR. USE OF THE INFORMATION ON THIS SITE MAY REQUIRE A LICENSE FROM A THIRD PARTY, OR A LICENSE FROM CYPRESS SEMICONDUCTOR.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms and Conditions of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms and Conditions of this site. Cypress Semiconductor and its suppliers reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

Spec No: None; Sunset Owner: KXP; Secondary Owner: VWA; Sunset Date: 01/01/20