| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a buffer memory circuit, capable of minimizing malfunction time due to temporary noise, etc., and being automatically restored so as not to exert adverse effects on communications afterwards. SOLUTION: Data quantity in a dual port memory 1 is detected with an address difference detecting part 60 and a buffer capacity monitoring part 61, and the malfunctions of a write address and a read address are detected by comparing the pieces of data quantity with an address control operation comparing part 7. In addition, the malfunctions of the write address and the read address which cannot be detected with an address control part 6 are detected using a parity generating part 3, by adding a parity shifted by one address from write data.</p> |
