| 摘要 |
PURPOSE:To protect a using area of an on-line CPU from a program in debugging of a debugging CPU and to improve the completion degree of debugging, by separating a duplicated shared memory partially. CONSTITUTION:Reading data 32, 33 outputted from respective duplicated memories are inputed to a data selecting device 27 and any one of them is selected and outputted to a processor 9 as reading data 23. Receiving a starting signal 24 from the processor 9, an internal controlling device 28 in a shared memory controlling means 8 starts access operation, and when a write inhibiting signal 34 is ''0'' and an address conversion available signal 40 is ''1'', outputs a starting signal 34 to respective shared memories 1A, 1B, inputs response signals 35, 37 and error reporting signals 36, 38 from the shared memories 1A, 1B, outputs a reading data selection specifying signal 29 to a data selecting device 27 so that errorless data are selected, and outputs a response signal 25 to the processor 9 to end the access operation. |
