Systems and methods for reconfiguring scan chains
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsJohn Bratt, Jeffrey Rearick
Life of this patent
Estimating the term…
Abstract
Systems and methods for reconfiguring scan chains are provided. A representative system incorporates a first scan chain of flip-flops operative in either a normal mode or a rotate mode such that, if the first scan chain is operative in the normal mode, inputs are provided to the flip-flops in sequential order with a first of the flip-flops receiving an input prior to a second of the flip-flops, and, if the first scan chain is operative in the rotate mode, inputs are provided to the flip-flops with the first of the flip-flops receiving an input subsequent to the second of the flip-flops.
Claims12
A method for reconfiguring scan chains comprising:
- providing a first scan chain of flip-flops;
- determining whether the first scan chain is to be operated in either a normal mode or a rotate mode;
- providing inputs to the flip-flops in sequential order such that a first of the flip-flops receives an input prior to a second of the flip-flops if it is determined that the first scan chain is to operate in the normal mode;
- and
- providing inputs to the flip-flops such that the first of the flip-flops receives an input subsequent to the second of the flip-flops if it is determined that the first scan chain is to operate in the rotate mode.
A method for reconfiguring scan chains comprising:
- providing an integrated circuit having a first scan chain and a second scan chain operative in parallel such that flip-flops of the first scan chain and the second scan chain that occupy corresponding data positions contain identical scan input data;
- and
- selectively reconfiguring the second scan chain such that flip-flops of the first scan chain and the second scan chain that occupy corresponding data positions do not contain identical scan input data.
A system for reconfiguring scan chains comprising:
- a first scan chain of flip-flops operative in either a normal mode or a rotate mode such that, if the first scan chain is operative in the normal mode, inputs are provided to the flip-flops in sequential order with a first of the flip-flops receiving an input prior to a second of the flip-flops, and, if the first scan chain is operative in the rotate mode, inputs are provided to the flip-flops with the first of the flip-flops receiving an input subsequent to the second of the flip-flops.
Dependencies are inferred from the claim text.