Patent ID: 6771611
Filing Date: 2004-08-03
Classification: H04L

Abstract:
A network transmitter generating data frames of data for transmission on a network medium, the transmitter including a frame generation circuit comprising:a) a register storing a predefined bit sequence corresponding to a network standard training bit sequence; b) a multiplexer with a first input receiving bits from the register corresponding to the network standard training bit sequence and a second input receiving bits representing the data for transmission, the multiplexer generating an output signal in accordance with a select signal; c) a schedule circuit driving the select signal to select bits from the register during a portion of the frame corresponding to a frame training sequence and driving the select signal to select the data for transmission during a portion of the frame corresponding to a data portion; and d) a scrambler that receives the data from a media access controller and provides the bits representing data for transmission to the multiplexer in a scrambled format, the scrambled format providing for adequate bit transitions to limit electromagnetic noise outside a predefined transmission band; and e) a second multiplexer selecting between data bits from the media access controller and data bits in the scrambled format and having an output coupled to the second input of the multiplexer and the schedule circuit further provides a bypass signal to the second multiplexer driving the second multiplexer to select scrambled data bits during a scrambled portion of the frame and to select data bits from the media access controller during an unscrambled portion of the frame.