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US 2012/0074983 A1Published application
Integrated Circuit with Configurable On-Die Termination
AssigneeRambus Inc.
InventorHuy Nguyen
Life of this patent
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Abstract
Described are integrated-circuit die with differential receivers, the inputs of which are coupled to external signal pads. Termination legs coupled to the signal pads support multiple termination topologies. These termination legs can support adjustable impedances, capacitances, or both, which may be controlled using an integrated memory.
Claims20
An integrated circuit comprising:
- an input pad to couple to an external signal channel;
- a reference-voltage terminal to receive a reference voltage;
- a receiver having a first input terminal coupled to the input pad and a second input terminal coupled to the reference node;
- a first termination leg extending from the first input terminal to a first termination-voltage node, the first termination leg including an adjustable first termination impedance in series with a first termination switch;
- and
- a second termination leg extending from the first input terminal to a second termination-voltage node, the second termination leg including an adjustable second termination impedance in series with a second termination switch.
3 more elements
A method for supporting multiple termination configurations of a communication port, including a first configuration supporting a first performance mode and a second configuration supporting a second performance mode, the method comprising:
- in the first mode, connecting the communication port to a first termination-voltage node via a first switch and a first termination impedance and to a second termination-voltage node via a second switch and a second termination impedance;
- and
- in the second mode, connecting the communication port to a third termination-voltage node via the first and second termination impedances and the first and second switches.
Dependencies are inferred from the claim text.