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US 8,941,407 B2Granted
Integrated circuit with configurable on-die termination
AssigneeRambus Inc.
InventorHuy Nguyen
Life of this patent
Estimating the term…
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.
Claims17
An integrated-circuit (IC) die comprising:
- a first input pad
- a second input pad;
- a receiver having differential input terminals, including a first input terminal connected to the first input pad and a second input terminal connected to the second input pad;
- and
- programmable on-die termination (ODT) circuitry that includes:
- a common node;
- a first termination leg extending between the common node and the first input terminal, the first termination leg including a first termination impedance;
- a second termination leg extending between the common node and the second input terminal, the second termination leg including a second termination impedance;
- and
- a third termination leg extending between the common node and a reference-voltage node, the third termination leg including a switch.
7 more elements
A computer-readable medium having stored thereon a non-transitory data structure defining an integrated circuit, the data structure comprising:
- first data representing first and second input pads to couple to an external signal channel;
- second data representing a receiver having differential input terminals, including a first input terminal connected to the first input pad and a second input terminal connected to the second input pad;
- and
- fourth data representing programmable on-die termination (ODT) circuitry that includes:
- a common node;
- a first termination leg extending between the common node and the first input terminal, the first termination leg including a first termination impedance;
- a second termination leg extending between the common node and the second input terminal, the second termination leg including a second termination impedance;
- and
- a third termination leg extending between the common node and a reference-voltage node, the third termination leg including a switch.
6 more elements
Dependencies are inferred from the claim text.