USB interface With AMBA AHB

Hello Joe, Have a look at USB core of synopsys. Their USB core has AHB interface. You should be more specific about what are you looking for then only i can clarify ur doubt.

Regards Praveen

Please take a look at our USB IP Cores as well

we have USB 1.1 and USB 2.0 Device and OTG IP Cores. All of our IPs support AHB, OPB, AVALON, PLB, OCP, WISHBONE and many custom buses as well.

Best Regards, rudi ============================================================= Rudolf Usselmann, ASICS World Services,

Your Partner for IP Cores, Design, Verification and Synthesis

Hi Rudolf and Prasannakumar,

Thanks for your reply. Let me put my question like this. In my USB core i have so many interfacing signals which are interfacing with the ARM Processor and the external world (D+ and D- etc...). What i would like to know is how to handle all these interfacing signals with AMBA AHB/APB, and is there any reference document which describes the timing issues between the USB core and AHB Bus signals according to AMBA Specification 2.0.

Regards... Joe

Rudolf Usselmann wrote:

There is no easy/simple answer for you question.

It boils down to understand what all those signals do and how to drive them. For example it took us more than two man-years to design a fully verified and functional AHB USB controller. So please don't expect to solve this problem in a few emails to a news group !

Best solution for you would be to either purchase a USB IP Core or use an external device for USB interface.

Best Regards, rudi ============================================================= Rudolf Usselmann, ASICS World Services,

Your Partner for IP Cores, Design, Verification and Synthesis

Hey,

I have USB1.1 hard IP and i want to interface this with ARM processor using AMBA AHB Specification 2.0 for high speed operation. The vendor of USB core is not supporting us becoz we have bought it long back. We have only USB datasheet nothing else. Now you please tell me is there any document to refer.

Rgds... Joe

dude what information are u looking for? The AMBA spec is readily available from ARM website. Whose USB core are u trying to implement? If u are asking for doumenation for that ... would you not have received that with the IP .. even if it was a long time ago.

Does the USB core have an AMBA interface? Or is the interface something else that you want to modify to connect to an AMBA bus? What is the interface?

We need more detail if we are going to help you.

Mike

What i would like to know is how to interface USB1.1 which is having non-AHB interfacing signals, which is working at fullspeed (12Mhz) with ARM processor which is operating at 25 MHz usign AMBA 2.0 specification.

--Joe

Mike Lewis wrote:

how can I possibly answer that without knowing what interface you do have? What are the non-AHB signals? I'm a good designer but not that good!

Mike

Joe, You are making us to answer question without knowing your background. Why donot you tell us which USB core you are having and what is this non AHB interface you are talking. you got to describe your problem.

Good luck Regards Praveen

I have a simple USB Devcie controller with some inputs and outputs, no special interfacing signals are attached to it. It's a simple USB Core running at fullspeed. My concern is how to tackle timing issues while interfacing it with ARM core.

Joe ... I think your missing the point. There has to be some interface (other than the external USB side) that is used to talk to the controller. A stand-alone self aware controller that thinks on its own doesn't exist. What is this simple interface? Is it a chip select with a read/write indicator? Is it synchronous .. ie does it have a clock? I would think that the actual timing would be a secondary problem that you would tackle after you have designed the interface to AMBA.

Also .... if you haven't already done so ... you should read the AMBA spec. located on the ARM web site. You're not gonna get anywhere without understanding what your trying to interface to.

Mike