Patent ID: 7602818
Filing Date: 2009-10-13
Classification: H04L

Abstract:
1. A Fibre Channel transceiver adapted to be implemented in lower performance process technology devices and capable of transmitting and receiving data between electronic devices in a Fibre Channel system, the Fibre Channel Transceiver comprising: a transmitter having a plurality of clocks and adapted for transmitting data between electronic devices in the Fibre Channel system; said transmitter further including a serializer for converting a lower speed parallel data stream to a higher speed serial data stream for transmission by the transmitter; a receiver having a plurality of clocks and adapted for receiving data transmitted between electronic devices in the Fibre Channel system; said receiver further including a deserializer for converting a receiver higher speed serial data stream from the Fibre Channel system to a lower speed parallel data stream, said deserializer including a voltage controlled oscillator (VCO); a frequency detector for detecting a frequency of received data, said frequency detector including: information from said counters being used to detect a frequency difference between the first and second clock signals, to determine which of said first and second counters is being driven by a higher frequency clock signal, and a degree by which the one of the first and second counters that is driven by a lower frequency one of the clock signals needs to be adjusted, and a magnitude of adjustment needed to be made to said VCO, to enable said first clock signal to be modified so as to be phase locked to an incoming data stream being received by said transceiver; an output preemphasis circuit for reducing jitter of an output serial data stream; and an output driver for controlling the output power of the transmitter based in part on an output of said output preemphasis circuit.