AM1808 Device Identification Register

Jamie Maxwell

Expert 1530 points

Other Parts Discussed in Thread: AM1808

Is the Device Identification Register a unique ID for each piece of silicon?

Can this be used as "key" for encryption?

Thanks

over 14 years ago

0 Daniel Allred over 14 years ago

TI__Genius 17355 points

Jamie,

Can be more specific about the register to which you are referring? Are you talking about the DIEID registers in the SYSCFG module, or something else?

As far as I know, there are no registers providing a random or psuedo-random value that would suitable as a cryptographic key or for deriving such a key.

Regards, Daniel

0 Jamie Maxwell over 14 years ago in reply to Daniel Allred

Expert 1530 points

Yes, that is the register I was referring to.

Thanks

0 Eric Hendecourt over 14 years ago in reply to Daniel Allred

Prodigy 40 points

Are the values in these registers (DIEID in SYSCFG) unique to each individual Silicon?

Or is it possible the two parts could have the same DIEID ?

Thanks

0 Daniel Allred over 14 years ago in reply to Eric Hendecourt

TI__Genius 17355 points

Eric,

The content of the four DIEID registers, when taken as a 128-bit value, is unique to each piece of silicon. The contents of those registers is not documented and will not be documented. Also, I want to reemphasize that the value should in no way be used for any cryptographic purpose, as it is not random.

In case you are interested, TI did just announce secure versions of these parts that provide protection of IP and code in the system flash. See here for info.

Regards, Daniel

0 Jamie Maxwell over 14 years ago in reply to Daniel Allred

Expert 1530 points

Daniel Allred said:

In case you are interested, TI did just announce secure versions of these parts that provide protection of IP and code in the system flash. See here for info.

This document refers to the DSP based C674x and OMAP-L1x.

The AM1808 does not have a DSP

Jamie

0 Daniel Allred over 14 years ago in reply to Jamie Maxwell

TI__Genius 17355 points

Sorry, you are correct. I guess I forgot which device we were talking about.

I apologize for the confusion.

Regards, Daniel

Processors

Processors forum

AM1808 Device Identification Register