Patent ID: 6418500
Filing Date: 2002-07-09
Classification: G06F,H04L

Abstract:
A termination system for use in a transmission system having a driver system, the transmission system for transmitting an electrical signal along an electrical signal line, the termination system comprising:a termination element, coupled to the driver system and the electrical signal line, for gating the electrical signal to the electrical signal line; a reference resistance system for providing a resistance value substantially equivalent to a line characteristic impedance of the electrical signal line; a feedback control system, coupled to the reference resistance system and the termination element, for generating a control signal to adjust a resistance of the termination element to match the line characteristic impedance of the electrical signal line; a comparison system, including a variable on-chip resistor, the comparison system coupled to the reference resistance system, for comparing a resistance value of the variable on-chip resistor to the resistance value of the reference resistance system and generating a comparison signal; a counter system, coupled to the comparison system, for generating a control code in response to receiving the comparison signal; and a termination code control filter, coupled to the counter system and the termination element, for generating a control signal in response to receiving the control code.