Method and apparatus for self-calibrating driving capability and resistance of on-die termination
AssigneeNovatek Microelectronics Corp.
InventorsYao-Cheng Chuang, I-Huan Huang
Life of this patent
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Abstract
A method and an apparatus for self-calibration of a driving capability and a resistance of an on-die termination are provided. The apparatus includes an output interface physical layer (PHY) and a ring oscillator. The output interface PHY receives an operation voltage. The ring oscillator surrounds the output interface PHY to sense a work temperature or the operation voltage and accordingly outputs a sensing result. The driving capability or the resistance of the on-die termination of the output interface PHY is adjusted according to the sensing result.
Claims16
An apparatus for self-calibrating a driving capability and a resistance of an on-die termination (ODT), comprising:
- an output interface physical layer (PHY), receiving an operation voltage;
- and
- a ring oscillator, surrounding the output interface PHY to sense a working temperature or the operation voltage of the output interface PHY and accordingly outputting a sensing result, wherein the driving capability or the resistance of the ODT of the output interface PHY is adjusted according to the sensing result.
An apparatus for self-calibrating a driving capability and a resistance of an on-die termination (ODT), comprising:
- an output interface physical layer (PHY), receiving an operation voltage;
- a plurality of ring oscillators, surrounding the output interface PHY to sense a working temperature or the operation voltage of the output interface PHY to provide a sensing result, wherein the driving capability or the resistance of the ODT of the output interface PHY is adjusted according to the sensing result;
- a plurality of counters, respectively coupled to the ring oscillators to perform counting according to a plurality of clock signals provided by the ring oscillators, and respectively providing a plurality of counting values;
- and
- an averager, coupled to the counters, and calculating an average counting value of the counting values provided by the counters, wherein the average counting value corresponds to the sensing result of the ring oscillators.
A method for self-calibrating a driving capability and a resistance of an on-die termination (ODT), comprising:
- using at least one ring oscillator to sense a working temperature of an output interface PHY or an operation voltage received by the output interface PHY, so as to provide a sensing result;
- and
- adjusting the driving capability or the resistance of the ODT of the output interface PHY according to the sensing result, comprising
- obtaining a counting value corresponding to the sensing result;
- obtaining a reference counting value, wherein the reference counting value is the counting value obtained when the output interface PHY is in a room temperature and the operation voltage is a rated voltage;
- and
- comparing the reference counting value with the counting value, and adjusting the driving capability or the resistance of the ODT of the output interface PHY according to a comparison result.
Dependencies are inferred from the claim text.