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US 12,224,748 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.
Claims20
An integrated-circuit die comprising:
- a receiver having an input terminal and an output terminal;
- a first switch having a first node coupled to a reference, a second node, and a third node, wherein the first switch selectively couples the first node to the third node and selectively couples the second node to the third node;
- a first termination element coupled between the third node and the input terminal;
- a second switch having a fourth node coupled to the reference, a fifth node, and a sixth node, wherein the second switch selectively couples the fourth node to the sixth node and selectively couples the fifth node to the sixth node;
- and
- a second termination element coupled between the sixth node and the input terminal.
3 more elements
A communication system comprising:
- a first IC die having:
- an output pad;
- and
- a transmitter coupled to the output pad to transmit data on the output pad;
- a second IC die having:
- an input pad;
- and
- a receiver coupled to the input pad to receive the transmit data;
- a communication channel extending between the output pad of the first IC die and the input pad of the second IC die;
- and
- a termination circuit integrated with one of the first and second IC dies and coupled to a respective one of the output pad and the input pad, the termination circuit including:
- a first switch having a first node coupled to a first reference, a second node, and a third node, wherein the first switch selectively couples the first node to the third node and selectively couples the second node to the third node;
- a first termination element coupled between the third node and the input pad;
- a second switch having a fourth node coupled to a second reference, a fifth node, and a sixth node, wherein the second switch selectively couples one of the fourth node to the sixth node and selectively couples the fifth nodes node to the sixth node;
- and
- a second termination element coupled between the sixth node and the input pad.
13 more elements
An integrated-circuit die comprising:
- a pad to receive an input signal to the die;
- a receiver having an input terminal coupled to the pad, a reference, and an output terminal;
- a first switch having a first control terminal, a first node coupled to the reference, a second node, and a third node, wherein the first switch selectively couples the first node to the third node and selectively couples the second node to the third node;
- a first termination element coupled between the third node and the input terminal;
- a second switch having a second control terminal, a fourth node coupled to the reference, a fifth node, and a sixth node, wherein the second switch selectively couples the fourth node to the sixth node and selectively couples the fifth node to the sixth node;
- a second termination element coupled between the sixth node and the input terminal;
- and
- a register with an output port coupled to the first control terminal, the register to store a value that determines whether the first switch supports a parallel termination configuration or a series termination configuration.
5 more elements
Dependencies are inferred from the claim text.