| 摘要 |
<p>PURPOSE:To execute the simulation by a real input by providing a trace memory for outputting independently data of an external input signal in accordance with a simulation command. CONSTITUTION:When input/output operations of data to a memory 22 of a process input card 2 are executed, a command analyzing part 26 analyzes this trace command, and outputs a signal 27. The signal 27 turns on a gate of a switching circuit 29, and data of an external input signal 6 is stored in a memory 22, and also, stored in a trace memory 25 of a large capacity, as well at every set period. Also, when a microprocessor CPU 1 outputs a simulation command at some timing, the analyzing part 26 outputs a signal 28. The signal 28 turns on and off gates of switching circuits 30, 31 and the data stored in the memory 25 is sent out to an input/output bus 3 through a switching circuit 24 in the same period as write. As a result, the signal traced once becomes useable as a real simulation output signal many times, and the simulation by a real input can be executed.</p> |
