USB应用的IP核心，需要深入了解 核心的行为。建立本 诀窍是大大简化了全面 参考应用。-Application of IP-Cores requires in-depth knowledge of the core’s behavior. Building up this know-how is greatly simplified by comprehensive reference applications.

nios ii中对USB的实用，包括IP核和C代码，方便实用-nios ii the use of USB, including IP core and C code, convenient and practical