hello all,

I'm recently working on a project using usb function controller which i found here(USB1.1 and 2.0).

Problem is that i don't have much pins for the utmi interface, so i wonder if i can make it into ulpi

interface. Can I transform the utmi to ulpi by simply adding a wrapper? if yes, how? if not, is there any

other solution that can reduce the number of pins?

thx for your help, i really appreciate it .

problem solved.
there is a free core using ulpi offered in QSYS Altera.

Could you provide me such link that where you find the ULPI core interface?

could you let me know where you find this core?

It's just in the QSYS IP list, category SLS.
but to use this ip, you need to require a opencore plus licence through a web link of SLS.
it's a opencore plus evaluation licence, and i don't think we can use the core for commercial purpose.
little boring = =!

For which purpose you need this core?
Reply to me on ravilife4rohit@yahoo.com

Thanks,
Ravi

Hello,

Yes, you can create a ULPI wrapper from a UTMI Interface.

ULPI is a Standard Interface "subset" specified by the overarching UTMI+ Standard Interface.

Ensure that for your wrapper you are writing synthesisable RTL with tight timing constraints and any clock domain crossing issues addressed and verified.

You should do your own research for your wrapper by downloading the specification whitepapers from the USB Integrators Forum (www.usb.org), and by using google for "utmi and ulpi" and then you should look at the timing and the signals and the busses you need to implement. Here is one pointer to get you started:

www.ulpi.org/utmiplus_whitepaper.pdf

When you write your own wrapper, don't forget that it's always best to write your testbench before you write the implementation. Even better, get a colleague to write the testbench while you write the implementation.

Good Luck, Richard.

Hi, All!

there is free open source vhdl utmi-ulpi bridge implementation at:
http://vr5.narod.ru/fpga/usb/index.html


vr5