| 摘要 |
PURPOSE:To trace easily an interface signal by storing simultaneously the interface signal in an external system and a micro instruction address by hardware. CONSTITUTION:In case that the log of the interface signal is stored, a tracer write control signal 101 is set to the high level by the execution of a microinstruction to write it on tracers 16 and 17. The value of a storage register 11 is written on the tracer 16, and the interface signal is written on the tracer 17. These stored interface signal and value of the storage register 11 are transmitted to a data bus 103 and are read out thereby. When tracers are stopped, the last read value is the latest data because an address counter 15 indicates an address following the last write address. |
