The universal serial bus (USB) transceiver macro cell interface (UTMI) is a two wire, bi-directional serial bus interface. UTMI consists of transmitting and receiving sections, in which the transmitter of the UTMI sends data to different USB devices through D+ and D-lines whereas the receiver gets data on the same lines. UTMI is one of the important functional blocks of USB controller, which can transmit and receive data to or from USB devices. There are three functional blocks present in USB

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... ntroller; those are Serial Interface Engine (SIE), UTMI and Device Specific Logic (DSL). The parallel data from SIE is taken into the transmit hold register and this data is sent to transmit shift register from where the data is converted serially. This serial data is bit stuffed to perform data transitions for clock recovery and NRZI (1) encoding. Then the encoded data is sent on to the serial bus. When the data is received on the serial bus, it is decoded, bit unstuffed and is sent to receive shift register. After the shift register is full, the Data is sent to receive hold register. This presentation reveals the FPGA implementation of UTMI transmission rate providing with USB 2.0 specifications. Further UTMI has been designed by using VHDL code and simulated, synthesized and programmed to the targeted Spartan family of FPGA in the Xilinx environment.