| 摘要 |
PURPOSE:To shorten both the fault time and its repair time by securing an automatic fault indication for the scattered logic blocks via the external unit. CONSTITUTION:The data comprising 64 units of information bits and 8 units of test bits is divided into 4 blocks and then supplied to data control circuits A1-A4 including the error detection/correction units of the same structure. At the same time, registers B1-B4 to hole the data composed of 18 bits are provided along with register output lines C1-C4 plus syndrome growing circuits G1-G4. Each of the bit lines is shown by S0-S7 which will be all ''0'' in case the information bit has some fault. And the single error is shown when odd units of ''1'' exist, and more than 2 or even units of error are shown in case even units of ''1'' exist respectively. These decisions are given at error bit decision circuit 2. Then error position indication signal line 3 is provided, and the register output of B1-B4 are corrected through correction circuits E1-E4. |
