| 摘要 |
PCT No. PCT/US81/01766 Sec. 371 Date Dec. 30, 1981 Sec. 102(e) Date Dec. 30, 1981 PCT Filed Dec. 30, 1981 PCT Pub. No. WO83/02344 PCT Pub. Date Jul. 7, 1983.Special control within a data processing system is signalled by a predetermined unique combination of data and error correcting code (ECC) bits. The predetermined combination, received from a source 1, is one which normally is decoded to indicate the presence of an uncorrectable error. A comparator 3 compares data bits held in a register 5 with a reference pattern of data bits held in a storage medium 7. At the same time, a syndrome generator 9 generates a syndrome from the received word, which syndrome is decoded by a syndrome decoder 11. If a particular flag syndrome sf (which is selected from the syndromes normally indicating the existence of an uncorrectable error) is detected, and comparator 3 indicates an equal comparison, AND 13 will provide a signal indicating that the unique combination has been received. It will also, through inverter 15 and AND 17 block transmission of an error indication to the system. |
