Efficient scan latch systems and methods

A method comprising:

• receiving a scan enable indication at a master latch;
• selecting between a scan input and a recirculation value in the master latch;
• choosing between a corresponding data input and results of the selecting, wherein the choosing is performed in a slave latch and the choosing is performed after the selecting in the master latch, wherein data input is independent of the scan input and results of a slave latch choice are forwarded as the recirculation logical value of the scan input;
• and
• choosing between the corresponding data input and the results of the selecting.

A scan flip flop comprising:

• a master latch-operable to select between a scan in value and a recirculation logical value;
• a slave latch operable to select between a data value and a resulting value forwarded from the master latch, wherein the data value is independent of the scan in value, and outputs of the slave latch are forwarded as the recirculation logical value that is received at the master latch;
• and
• a control component that controls an indication of the selection by the master latch and the slave latch.