US 2022/0187370 A1 · Circuits And Methods For Configurable Scan Chains

Abstract

An integrated circuit includes first and second data storage circuits, first, second, and third shadow storage circuits, and first, second, and third multiplexer circuits. The first multiplexer circuit is configurable to provide a state of a data signal from the first data storage circuit to the first shadow storage circuit in a snapshot mode. The second multiplexer circuit is coupled between an output of the second data storage circuit and an input of the second shadow storage circuit. The third multiplexer circuit is coupled to the second multiplexer circuit. The third multiplexer circuit is configurable to provide a state of an output signal of the first shadow storage circuit to an input of the third shadow storage circuit in a scan mode bypassing the second shadow storage circuit.

Claims20

Dependent claims

An integrated circuit comprising:

first and second data storage circuits;
first, second, and third shadow storage circuits;
a first multiplexer circuit configurable to provide a state of a first data signal from the first data storage circuit to the first shadow storage circuit in a first snapshot mode;
a second multiplexer circuit coupled between an output of the second data storage circuit and an input of the second shadow storage circuit;
and
a third multiplexer circuit coupled to the second multiplexer circuit, wherein the third multiplexer circuit is configurable to provide a state of an output signal of the first shadow storage circuit to an input of the third shadow storage circuit in a scan mode bypassing the second shadow storage circuit.

3 more elements

An integrated circuit comprising:

first and second data storage circuits;
first, second, and third shadow storage circuits;
a first multiplexer circuit coupled between an output of the first shadow storage circuit and an input of the first data storage circuit;
a second multiplexer circuit coupled between an output of the second shadow storage circuit and an input of the second data storage circuit;
and
a third multiplexer circuit coupled to the second multiplexer circuit, wherein the third multiplexer circuit is configurable to provide a state of an output signal of the first shadow storage circuit to an input of the third shadow storage circuit in a scan mode bypassing the second shadow storage circuit, and wherein the first multiplexer circuit is configurable to provide the state of the output signal of the first shadow storage circuit to the input of the first data storage circuit in a first user storage mode.

3 more elements

Dependencies are inferred from the claim text.

Circuits And Methods For Configurable Scan Chains

Life of this patent

Circuits And Methods For Configurable Scan Chains

Life of this patent

Abstract

Claims20