Timing based arbitration methods and apparatuses for calibrating impedances of a semiconductor device
AssigneeMicron Technology, Inc.
InventorsChristopher G. Wieduwilt, Jason Johnson
Life of this patent
Estimating the term…
Abstract
Systems and apparatuses are provided for an arbiter circuit for timing based ZQ calibration. An example system includes a resistor and a plurality of chips. Each of the plurality of chips further includes a terminal coupled to the resistor and a calibration circuit. The calibration circuit determines whether the resistor is available based, at least in part, on timing information that is unique to a corresponding chip of the plurality of chip. The timing information of each chip of the plurality of chips has a fixed duration of time common to the plurality of chips.
Claims20
An apparatus comprising:
- a driver circuit coupled to a terminal of a chip;
- and
- an arbiter circuit configured to enable the driver circuit to change a voltage of the terminal before determining a resistor coupled to the terminal is available for a calibration operation of the chip, wherein the arbiter circuit enables the driver circuit based at least in part, on timing information unique to the chip.
An apparatus comprising:
- a first driver circuit coupled to a terminal of a chip;
- a second driver circuit;
- and
- an arbiter circuit coupled to the first driver circuit and the second driver circuit, wherein the arbiter circuit is configured to enable the first driver circuit and the second driver circuit by providing a first code, wherein when the arbiter circuit provides the first code is based at least in part, on timing information unique to the chip.
The apparatus of 13, further comprising a calibration code control circuit configured to receive the first code from the arbiter circuit and the comparator result from the comparator circuit, wherein the calibration code control circuit is further configured to provide a second code to enable the third driver circuit, wherein the second code is based, at least in part, on the timing information unique to the chip.
An apparatus comprising:
- a driver circuit coupled to a terminal of a chip;
- an arbiter circuit;
- and
- a calibration control circuit coupled to the driver circuit, the calibration control circuit configured to adjust an impedance of the driver circuit after determining a resistor coupled to the terminal is available for a calibration operation of the chip, wherein determining the resistor coupled to the terminal is available is based at least in part, on timing information unique to the chip.
Dependencies are inferred from the claim text.