We're now using OMAP3530 and ISP1504 as the USB host solution. Sometimes the ULPI register access to ISP1504 fails and sometimes sucess. We've detected the voltage of ISP1504 pins and it seems to work well. Has anybody ever met the same problem with us? We are not sure whether it's the problem of ISP1504 or OMAP3530's host controller or just the coopration of them? Hopefully somebody can help me.
Thanks!!