Patent ID: 6975132
Filing Date: 2005-12-13
Classification: H04L

Abstract:
1. A Tx line driver with selectable pre-emphasis and primary current levels, comprising: a primary current driver for producing, based on an input serial data stream, an output serial data stream at an output node having a primary current level based upon a selectable primary reference current level; a primary current selection module for generating the selectable primary reference current to the primary current driver; a pre-emphasis current driver coupled to produce pre-emphasis current to the output node based upon a selectable pre-emphasis reference current; a pre-emphasis current selection module for generating the selectable pre-emphasis reference current to the pre-emphasis current driver independent of the primary current selection module; logic for selecting one of a plurality of selectable reference currents of the primary and pre-emphasis current selection modules, the logic producing current setting control signals to the pre-emphasis current selection module and to primary current selection module; and logic for producing a pre-emphasis signal.