| 摘要 |
<p>PURPOSE:To prevent the state from erroneously deciding as a synchronization state when a fault fixing the specific bit of a data to a prescribed value takes place. CONSTITUTION:After the data F1, F2 of a specific bit pattern are detected and the synchronization state is decided, the data F1, F2 are compared with every relevant bit to find out a coincident bit whose value is coincident. For example, 3rd and 7th bits are coincident bits and the value is respectively set to '0' and '1', a data whose 3rd bit is not '0' and whose 7th bit is not '1' is retrieved from a random data string in succession to the data F1, F2. When the data cannot be retrieved, the decision in which a fault whose specific bit is fixed to a prescribed value takes place in the synchronization state is decided to be in error.</p> |
