Le Tue, 29 Jan 2008 03:58:42 -0800, Steve a écrit:

> Hi,
>
> I've been tasked with creating a USB 2.0 interface for a FPGA design
> running embedded Linux (Windriver) and have found myself mired in a
> land of endless datasheets and acronyms.
>
> What I would like to do in my design is have my FPGA, running Linux,
> interface with a chip that essentially does all the PHY and MAC
> functionality of the USB standard. What I set out to look for were
> chips that would at one end provide USB Phy pins and at the other USB
> EHCI pins (so that I could then write some VHDL to interface with my
> CPU). I could then rely on Linux to provide all of the USB stack, so
> that I didn't need to manually write a device driver myself. (I
> understand that EHCI is some sort of standard driver -> device
> register map, that largely makes device drivers for USB controller
> irrelevant)
>
> Are these reasonable assumptions?
>
> So far, the majority of USB chips appear to be either simplified USB
> perpherial chips (essentially a bus slave, without the ability to
> initate a transaction on the bus), Host controller chips, but without
> the EHCI interface (SL811HS), or high-end microcontrollers (Freescale
> MCF5251) with a bunch of stuff that I don't need (and can't interface
> with my FPGA).
>
> Therefore, can anyone recommend a monolithic chip that I can purchase
> which will provide all of the necessary USB Phy/MAC functionality
> required to interface as a HOST in Linux?
Sure, ISP1161 (or possibly ISP1181).
>
> Kind regards,
>
> Stephen



--
HBV

If you have a decent FPGA you can have a Linux enabled CPU and the USB
MAC programmed in there. So you just need a PHY (a USB PHY is a very
simple chip).

Is that what you want to accomplish ?

-Michael