Inversion of scan clock for scan cells
AssigneeMarvell International Ltd.
InventorTeck Wee Patrick Tan
Life of this patent
Estimating the term…
Abstract
A device includes a scan circuit including a scan chain. The scan chain includes a first plurality of scan cells that receive a first scan clock signal in a first clock domain. A second plurality of scan cells receives a second scan clock signal in a second clock domain. A scan clock source generates the first scan clock signal and the second scan clock signal, and selectively inverts the first scan clock signal and the second scan clock signal based on an operating mode of the first plurality of scan cells and the second plurality of scan cells, respective flip-flop arrangements of the first clock domain and the second clock domain.
Claims16
A device comprising:
- a scan circuit including a scan chain, the scan chain having
- a first plurality of scan cells that receive a first scan clock signal in a first clock domain;
- and
- a second plurality of scan cells that receive a second scan clock signal in a second clock domain;
- and
- a scan clock source that generates the first scan clock signal and the second scan clock signal, and that selectively inverts the first scan clock signal and the second scan clock signal based on
- an operating mode of the first plurality of scan cells and the second plurality of scan cells;
- and
- respective flip-flop arrangements of the first clock domain and the second clock domain.
A method comprising:
- receiving a first scan clock signal at a first plurality of scan cells in a first clock domain;
- receiving a second scan clock signal at a second plurality of scan cells in a second clock domain;
- generating the first scan clock signal and the second scan clock signal at a scan clock source;
- and
- selectively inverting the first scan clock signal and the second scan clock signal based on
- an operating mode of the first plurality of scan cells and the second plurality of scan cells;
- and
- respective flip-flop arrangements of the first and second clock domains.
Dependencies are inferred from the claim text.