Resistors for DCI (Digitally Controlled Impedance)

Spartan-3 USB 2.0 Modules
1

Hello

I’d like to know if reference resistors for DCI (Digitally Controlled Impedance) are implemented on XEM3001v2. And if not, how and where can we put resistors on?

Thanks

Hiroki

2

The XEM3001 has no such resistors installed on-board.

3

Thanks for the reply.

So does it mean DCI functionality, which is available on Spartan 3 itself, is practically inaccessible on XEM3001? Or is there a way, e.g. by manually putting a resistor somewhere on the board, to get it work?

hiroki

4

You would need to evaluate the effort required to make DCI work on the XEM3001. We did not design it with DCI resistor pads.

The XEM3010 may be a better choice since it has such resistor pads available.

5

OK.

I think it would be nice if you could include a short note about which function of Spartan 3 are supported by XEM3001 and which are not in the user manual.

thanks anyway