| 摘要 |
PURPOSE:To confirm the normality of a scan function by selecting and storing data with an H level or an L level to be written on a scan FF by a data select signal. CONSTITUTION:When the signal of a data input terminal D is fetched by the leading edge of a pulse inputted to the clock terminal CK of the scan FF via a pin scan clock distribution circuit DL, the signal with the H level is stored in the scan FF. Also, when the signal with the H level of the data select signal DS is inputted, a gate T2 is opened, the signal with the L level in which a pin scan clock signal PCK is delayed at a delay circuit DY is inputted to the terminal D. Therefore, the signal with the L level is stored in the scan FF. Thus, it is possible to read a desired signal in the scan F by the select signal Ds, and by inputting and reading out the data with a different code, the normality of the operation of the scan FF can be confirmed. |
