TUSB4020B UUID Read

Hello,
Can you elaborate more about your implementation? We can send you the tool to program the eeprom.
Regards

Dear Elias!

We are planning to place this chip to our device to have possibility to differentiate it of others. For example, the keyboard with this hub can be easily differentiated of other one in case of replacement. Also UUID should be unique between all devices we can find.
I know the whole solution price will quite costly but it will be unique as well.

The keyboard was just example.

Regards,
Nick

Dear Elias!

Actually, I purchased two separate TUSB4020BPHPEVM boards. One is for our programmer team and one is for our BIOS team (for me).

We have chosen TUSB4020 because of its possibility to provide unique and non-changeable UUID, preprogrammed at TI factory during manufacturing process.

Also I found these two boards have different serial numbers.

One is 550008591D63 and another one is 450000591D63.

Both boards have no EEPROM installed. According to the hub datasheet USB hub has several OTP registers but Serial number is not covered by there registers.

The questions are:

Is it programmed at factory together with UUID? If not, how can it be programmed in field (during OEM device manufacturing process)?

Is it possible to change it?

How can I read UUID by software? I believe this way should be available, otherwise why this UUID was implemented...

Regards,

Nick

Hi Nick,

A unique serial number is a Microsoft requirement for USB devices.  Each TUSB4020B will report a serial number that is preprogrammed during production.  This value can be overwritten using EEPROM, not OTP.  The USB host will read the UUID from the hub during enumeration.  If you are using a Windows platform you should be able to read the value using Device Manager.

REgards,

JMMN

Dear JMMN!

If I understood you correctly, the Serial Number is also unique feature that is provided by TI USB Hub Chip.
Am I correct?

Also, what do you mean for "during production"?
Is that "during TI USB Hub production at TI factory" or "during final device production with TI USB Hub integrated"?

As for UUID, I need to check this at BIOS level, before Windows started.
Is there the way to do that? I mean the low level way? (without Device Manager or such things)
May be the special command or responce field should be checked for that?

Regards,
Nick

HI Nick,

Serial number is programmed during production at the TI factory. To read the UUID from the hub, you will need to enumerate the device and request the BOS descriptor. The UUID is reported as part of the BOS descriptor.

Regards,
JMMN

Dear JMMN!

Thanks a lot for the update. This even more than I expected. We need any unique "number". In case the Serial Number is programmed at TI, it can be interpreted as unique number as well as UUID.

Regards,

Nick

Dear JMMN!

Do you have information about life time of this USB Hub? Will it be available for 5-6 years since this time?

Regards,
Nick

Dear JMN!

Thanks a lot again and have a nice weekend!

Regards,
Nick