| 摘要 |
PURPOSE:To detect a fault of a memory storing a cell without addition of redundant data. CONSTITUTION:A cell validity discrimination section 1 detects an invalid and undefined ATM cell to be received and a cell write/read section 2 applies write/ read the ATM cell to/from a memory. A memory test control section 3 writes/ reads the test data for detecting a fault of a memory area not in use to conduct a memory normality test when the received ATM is an invalid and undefined cell to provide a memory fault signal, and a memory control section 4 controls the access of the write/read control section 2 and the memory test control section 3 to the memory. When the invalid and undefined cell is received, a memory area not in use is tested to detect a fault of the memory.
|
