USB receiver/transmitter for FPGA implementation

The paper is a study of USB standard based on authors own concept of specialized digital architecture providing USB communication. Presented module connects peripheral device with a computer via USB cable. In accordance with functionality, the design was partitioned to three units. UTMI block deals with USB cable, time frame synchronization and serial transmission. PIE block, divided to two parts, is responsible for packet construction/extraction and byte oriented communication with the peripheral system. Each module is controlled by the dedicated Finite State Machine. The architecture was implemented in VHDL, verified and synthesized. Design complexity arises questions about feasibility of USB interface application in specialized devices and low-volume segments of electronic devices, especially when compared to traditional RS232/UART interfaces.