红外数据传输速率为4Mbit/s时的编解码4PPM，用vhdl实现的源代码，,Infrared data transfer rate of 4Mbit/s when the codec 4PPM, using VHDL implementation of the source code,

USBHostSlave is a USB 1.1 host and Device IP core. – Supports full speed (12Mbps) and low speed (1.5Mbps) operation. – USB Device has four endpoints, each with their own independent FIFO. – Supports the four types of USB data transfer control,