| 摘要 |
PURPOSE:To completely know the executing state of a processor by adding a read-out count setting circuit provided with an instruction byte number storage part and a counter so that consecutive instructions beginning from a first operation code can be read out of a queue. CONSTITUTION:A read-out count setting circuit 11 provided with an instruction byte number storage part 13 for outputting a prescribed value in accordance with how many byte instruction an instruction beginning from a first operation code is when a first operation code of an instruction of a processor 2 is inputted, and a counter 15 for setting this output value and executing the count is added. In such a state, when a queue status signal 33 is received, a first operation code is read out of a first-in first-out storage device 4 and inputted to a number of instruction bytes storage part 13, and thereafter, until the count of the counter 15 comes to a prescribed value, the contents of the first-in first-out storage device 4 are read out, and consecutive instructions beginning with a first opera tion code are read out. In such a way, in the case of executing instruction tracking of the processor, dequeuing can be executed, and a correct analysis can be executed. |
