| 摘要 |
PURPOSE:To delete undesired information and to perform a program debug at a high speed and with high efficiency by using the 1st and 2nd comparison deciding means to detect the coincidence between the execution and designation addresses and masking a part of the comparison subject of one of both comparison deciding means with the mask information given previously from outside. CONSTITUTION:An execution address holding means 1 of a program debug system holds the address of the instruction to be executed by the system. While a designation address holding means 2 holds the address designated previously by a hardware type switch, an instruction, etc. Then an execution address holding means 5 holds the address of the data to which the instruction to be executed by the system refers. While a designation address holding means 6 holds the address designated previously. The coincidence of addresses is detected by the comparison deciding means 3 and 8 among those means 1 and 2 as well as 5 and 6 respectively. A mask holding means 7 is provided to the means 3 and a part of the result of the comparison decision is excluded by the mask information held previously by the means 7 and informed to an information means 4. Thus the program debug is carried out at a high speed.
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