Scan cells with minimized shoot-through and scan chains and integrated circuits using the same
US7747917B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2008 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | May 23, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318594
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A scan including data and shift inputs, and input selection circuitry for selecting between the data and shift inputs during normal, capture, and shift modes in response to only a first control signal and a second control signal. The input selection circuitry includes a first storage element for storing a bit representing a state of the first control signal in response to a change in state of the second control signals and multiplexing circuitry. The multiplexing circuitry is operable in the normal mode to select the data input in response to a first state of the second control signal, in the capture mode to select the data input when the bit stored in the first storage element represents a first state of the first control signal, and in the shift mode to select the shift input when the bit stored in the first storage element represents a second state of the first control signal. A second storage element stores, in response to the first state of the first control signal, data presented at the selected one of the data and shift inputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.