| 摘要 |
PURPOSE:To compact an emulator part by providing plural emulator parts composed of a changing-over circuit, an I/O port, an address buffer and a processor and giving a function changing-over command from a control part. CONSTITUTION:When a command 15 is outputted from the control processor in a controller 10 to a changing-over circuit 35A of an emulator part 20A, an I/O port 45A is made enable through a circuit 35A and an address buffer 55A is set to disable. In the same way, by outputting a command 15B to a changing-over circuit 35B, an I/O port 45B is set to disable and an address buffer 55B is set to enable. By the setting, emulator parts 20A and 20B output the input output signal of the I/O port at the emulator part 20A from the output of an LSI chip and outputs the internal address signal from the emulator part 20B respectively. Thus, the emulator part can function as buses 202 and 106C, a special chip is not necessary and the emulator part can be compacted. |
