| 摘要 |
<p>An oscillation detecting circuit (15) of a JTAG-LSI (10) is provided between an input pin (11), through which the oscillating signal of an oscillator (20) is input, and a boundary register cell (12). The oscillation detecting circuit (15) makes a control such that a signal output from the oscillator (20) is received through the input pin (11), the frequency of the signal is counted, and a value of "1" is stored in the boundary register cell (12) when the frequency is equal to or more than the counter upper limit. Herein, in a case where the value stored in the boundary register cell (12) is "1", it is possible to determine that the wiring paths between the oscillator (20) and the JTAG-LSI (10) is appropriate.</p> |
