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my task is to implement USB interface device in MAXII device
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You can't put new logic into the MAX II device without loosing the embedded USB Blaster functionality.
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I could not figure it out from the reference manual about communication facility between MAXII and Cyclone III devices.
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I see, that there's a complete USB_PHY_xxx bus provided in the hardware design. But I didn't yet see any related Dev Kit documentation. My assumption is, that Altera planned to include a defined interface to USB PHY in the MAX II logic, but either didn't yet implement it or omit it from the documentation. You may want to ask Altera support about the intended use of USB_PHY_xxx signals respectively a suggested way to utilize the USB interface for user communication.
Previous Dev Kits usually had a second USB interface for user communication. Most likely it has been regarded by Altera as waste of resources, because it was used very rarely. The USB_PHY_xxx interface seems to be a successor, apparently still under construction.
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