An asynchronous FIFO circuit has. The rifle recoil pad includes a flexible yoke, an energy-absorbing cushion, and a counter-weight. End-to-End Quality of service delivered over the transmit and receive path can thus be monitored. The single crystal wafer can be suitably used to form an operation region of a semiconductor device. Using the redundant TTs, less noise is introduced onto the data tones within a data frame. The receiving connector also has an electrical interface accessible by the user.