VLSI implementation of LTSSM

Link Training and Status State Machine (LTSSM) is a state machine in Universal Serial Bus (USB) which is defined for link connectivity and the link power management. LTSSM consists of 12 distinct states which are characterized depending on their functionalities. This paper reveals the FPGA implementation of LTSSM providing with USB 3.1 specifications with a support of USB 3.0 and 2.0 specifications also. The implementation includes the transition of all states present in the state machine. Further LTSSM has been designed by using Verilog code and simulated, synthesized and programmed to the targeted Artix-7 family of FPGA in the Vivado Xilinx environment.