Patent ID: 8880965
Filing Date: 2014-11-04
Classification: G01R

Abstract:
1. A low power scan flip-flop cell operable in a functional mode and a scan mode, comprising: a multiplexer for receiving a data input (D) signal and a scan input (SI) signal, and generating a first data signal depending on a scan enable (SE) signal; a master latch, connected to the multiplexer, for receiving the first data signal and generating a first latch signal; a scan slave latch, connected to the master latch, for receiving the first latch signal and generating a scan output (SO) signal; and a data slave latch, connected to the master latch and receiving the first latch signal, for generating a Q output depending on the SE signal and the first latch signal, wherein the Q output is maintained at a predetermined level during the scan mode, and wherein the data slave latch comprises: