A latch circuit includes a feedback circuit having inverter circuits and at least two input terminals and an input circuit for inputting input signals or signals having the same phase as the input signals to the input terminals of the feedback circuit in synchronization with a clock signal. 6 \u03bcm or less can be obtained by grindingmixing a silicon nitride powder and a metal powder together until the average particle size of the silicon nitride powder becomes 30 to 60 nm, and subsequently by molding and sintering. These steps can be repeated any number of times to create multiple stitches through the tissue. The margin is enhanced because array noise derived from reading is reduced. Otherwise, the system computes a path-based delay for the path by performing a path-based STA on the path.