| 摘要 |
PURPOSE:To reduce the number of test use signal lines by applying bus- connection of the test use signal lines to a function block. CONSTITUTION:A block terminal circuit 120 is classified into a block input terminal circuit 121, a block output terminal circuit 122 and a block input output terminal circuit 123 depending on the direction and contents of the signal. When a concerned block is designated to the normal mode through a test mode control block, signals from each of function blocks 101-103 are received/outputted through signal lines 136, 137, an input signal line group 132 and an output signal line group 133 between blocks, and when the block is designated to be a test object in the test mode, signals are received/outputted through a test input bus 134 and a test output bus 135. When the block is designated to a test non- object in the test mode, an input signal to the function block and an output signal from the function block are converted into fixed signals with an inactive level. |
