IO driver impedance calibration

摘要

An IO driver for an integrated circuit and a method for calibrating such an IO driver are provided. The IO driver comprises a plurality of IO driver cells, a plurality of IO partial driver cells and an external resistor. The IO driver cells control IO operations for a corresponding plurality of data channels of the integrated circuit. The IO partial driver cells are coupled to respective cells of the plurality of IO driver cells. The external resistor provides a reference impedance. The reference partial driver cell is coupled to the external resistor and is arranged to determine the reference impedance and to provide information depending on the reference impedance to the IO partial driver cells. The IO partial driver cells are arranged to calibrate the respective IO driver cells based on the provided information.

主权项

1. An IO driver for an integrated circuit, the IO driver comprising:
a plurality of IO driver cells for controlling IO operations for a corresponding plurality of data channels of the integrated circuit; a plurality of IO partial driver cells, respectively coupled to the plurality of IO driver cells, wherein an IO partial driver cell comprises a first type of transistor and its respective IO driver cell comprises a second type of transistor, different from the first type; an external resistor for providing a reference impedance; and a reference partial driver cell coupled to the external resistor and being arranged to determine the reference impedance and to provide information depending on the reference impedance to the IO partial driver cells, the IO partial driver cells being arranged to calibrate the respective IO driver cells based on the provided information.