FX3 Eeprom Max size

ToKi_1339406 · ‎Jul 19, 2020

Dear supports,

we want to use memory in normal operation F/W (280KB) + backup F/W (280KB).

During normal operation, only F/W (280KB) is used. If there is a problem with the F/W in the EEPROM, we would like to be able to boot to the Backup F/W.

(Only one of normal operation F/W or backup F/W)

Currently, we understood that the use of 256KB EEPROM 2EA in FX3 is the limit specification.

However, the EEPROM memory-related restrictions on the FX3 document have not been confirmed and the reason is unknown.

Please answer the following questions.

1. Reason for FX3 + 256K EEPROM 2EA limit specification
2. Whether FX3 and EEPROM can be used as follows.

1) FX3 + 512KB EEPROM 1EA

2) FX3 + 512KB EEPROM 2EA

Best Regards,

Tony Kim

YashwantK_46 · ‎Jul 21, 2020

Hello Hyundong,

It is not possible for FX3 Bootloader to address 1024KB (512KB x 2).

As mentioned on Page 13, Section 5.1 Features of the EZ-USB® FX3™/FX3S™ Boot Options:

It is only possible to address a max of 4 x 128KB (highlighted in green) EEPROM's which gives the total size that can be used as 512KB as shown in the image attached

So, you can either use 4 x 128KB or 2 x 256 KB EEPROM's (1 x 512KB EEPROM can be interfaced but we haven't tested it on our end).

Regards,
Yashwant

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FX3 Eeprom Max size

FX3 Eeprom Max size

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