| 摘要 |
<p>A cache store (10) is provided in conjunction with a main store (2). Each location of the cache (10) has a changed bit (CH). A list (4) is maintained of the addresses of those locations in the cache store which have been modified. When the list (4) becomes full, the entry at the head of the list is read out and the corresponding data item is transferred from the cache (10) to the main store (2). Thus, there are never more than a limited number of items in the cache awaiting transfer. To clear the cache of all modified items, each entry in the list (4) is read out in turn and the corresponding items are transferred to the main store (2). The system reduces the amount of traffic between the cache (10) and the main store (2) and hence improves efficiency.</p> |
