The receive elastic buffer enables the 10-bit parallel TBI data, received from the PMA sublayer synchronously to the TBI receiver clocks, to be transferred onto the core internal 125 MHz clock domain.The receive elastic buffer is an asynchronous First In First Out (FIFO) implemented in internal RAM. The operation of the receive elastic buffer attempts to maintain a constant occupancy by inserting or removing Idle sequences as necessary. This causes no corruption to the frames of data.