| 摘要 |
PURPOSE:To place always the priority to the priority processing than the normal processing, by discriminating whether a queuing processing request data is a normal processing request or a priority processing request and processing separately respective processing memories and address counters. CONSTITUTION:When the queuing processing request data is inputted, it is stored in an input data register 1, the normality of the content is checked at an input data check circuit 9 and the write is designated in normal/priority processing memories 10/11 by normal/priority processing discriminating information included in the data. A common address control circuit 18 checks the presence of a data write area of the memories 10/11 and designates the write address of the memory 10 or 11 with the discriminating information from the circuit 9. In case of the read, the circuit 18 checks the presence of the data not processed in the memory 11 and if the data not processed exists, the reading operation is done at a reading address from a priority processing read address counter 16. When the priority to the processing exists in the processing request data, the processing is done always with a priority than the normal processing data regardless of the order of request. |
