Patent ID: 7256618
Filing Date: 2007-08-14
Classification: H03K,H03M

Abstract:
1. A semiconductor integrated circuit device, comprising: first to n-th shift registers; first to n-th input terminals that receive data fed to the first to n-th shift registers; a first switch that electrically connects and disconnects an output of a k-th shift register (where k is an integer such that 1≦k≦n−1) and an input of a k+1-th shift register; a second switch that electrically connects and disconnects an input of the k+1-th shift register and a k+1-th input terminal that receives data to the k+1-th shift register; and a selection signal input terminal that receives a selection signal for switching ON/OFF of the first switch and the second switch, wherein, when the k-th shift register and the k+1-th shift register are used in a combined manner, the first switch is turned ON and the second switch is turned OFF by the selection signal, and wherein, when the k-th shift register and the k+1-th shift register are used separately, the first switch is turned OFF and the second switch is turned ON by the selection signal.