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US 8,570,063 B2Granted
Methods and apparatuses including an adjustable termination impedance ratio
AssigneeMicron Technology, Inc.
InventorTerry M. Grunzke
Life of this patent
Estimating the term…
Abstract
Methods of adjusting a centerline voltage of a data signal are described, along with apparatuses to adjust the centerline voltage. In one such method, portions of a termination circuit coupled to a node are selectively programmed to adjust an impedance of the termination circuit to adjust the centerline voltage of the data signal driven to the node. One such apparatus includes pull-up impedances and pull-down impedances that can be programmed to adjust the centerline voltage of the data signal. Additional embodiments are also described.
Claims16
A method comprising:
- selectively programming portions of a termination circuit coupled to a node in a first device to adjust an impedance of the termination circuit to adjust a centerline voltage of a data signal driven to the node that is coupled to a system, selectively programming the portions comprising:
- switching on a transistor in the termination circuit coupled between a supply voltage and the node responsive to a termination value stored in a register;
- and
- adjusting the termination value stored in the register responsive to a change in a voltage associated with an apparatus including the termination circuit.
1 more element
A method comprising:
- selectively programming portions of a termination circuit coupled to a node in a first device to adjust an impedance of the termination circuit to adjust a centerline voltage of a data signal driven to the node that is coupled to a system, selectively programming the portions comprising:
- switching on a transistor in the termination circuit coupled between the supply voltage and the node responsive to a termination value stored in a register;
- analyzing the system;
- and
- adjusting the termination value stored in the register responsive to the analysis of the system.
2 more elements
A method comprising:
- selectively programming portions of a termination circuit coupled to a node in a first device to adjust an impedance of the termination circuit to adjust a centerline voltage of a data signal driven to the node that is coupled to a system, selectively programming the portions comprising:
- switching on a transistor in the termination circuit coupled between a supply voltage and the node responsive to a termination value stored in a register;
- and
- adjusting the termination value stored in the register responsive to a control signal received from a second device coupled to the system.
1 more element
A method comprising:
- selectively programming portions of a termination circuit coupled to a node in a first device to adjust an impedance of the termination circuit to adjust a centerline voltage of a data signal driven to the node that is coupled to a system, selectively programming the portions comprising:
- switching on a transistor in the termination circuit coupled between a supply voltage and the node responsive to a termination value stored in a register;
- and
- adjusting the termination value stored in the register responsive to a change in a temperature associated with an apparatus including the termination circuit.
1 more element
An apparatus comprising:
- a plurality of pull-up impedances coupled between an external node and a first supply voltage node and configured to be programmed to adjust a centerline voltage of a data signal on the external node;
- a plurality of pull-down impedances coupled between the external node and a second supply voltage node and configured to be programmed to adjust the centerline voltage of the data signal on the external node;
- a driver circuit coupled to drive the data signal to the external node;
- and
- a controller configured to program at least a portion of the pull-up impedances and at least a portion of the pull-down impedances to adjust the centerline voltage of the data signal on the external node, wherein the controller comprises:
- a control circuit;
- a termination register coupled to the control circuit;
- and
- a termination control circuit coupled to the control circuit and the termination register.
6 more elements
An apparatus comprising:
- a plurality of pull-up impedances coupled between an external node and a first supply voltage node and configured to be programmed to adjust a centerline voltage of a data signal on the external node;
- a plurality of pull-down impedances coupled between the external node and a second supply voltage node and configured to be programmed to adjust the centerline voltage of the data signal on the external node;
- a driver circuit coupled to drive the data signal to the external node;
- and
- a controller configured to program at least a portion of the pull-up impedances and at least a portion of the pull-down impedances to adjust the centerline voltage of the data signal on the external node, wherein the controller is configured to adjust the programming of the at least a portion of the pull-up impedances and the at least a portion of the pull-down impedances responsive to changes in temperature or changes in a voltage or changes in the temperature and changes in the voltage.
2 more elements
Dependencies are inferred from the claim text.