| 摘要 |
A memory system has a plurality of memory modules. A longitudinal parity word is stored in one memory module and correction words are stored in each of the other memory modules. When one of the data words in a memory module having a correction word is changed, the correction word is also changed from a prior value to a new value so that the longitudinal parity of the data in the modules is unaffected. The new value of the correction word is computed by EXCLUSIVE ORing the value of the data word before the change, the data word after the change, and the prior value of the correction word. |
