| 摘要 |
PURPOSE:To obtain strict standards with small variance between an internal control signal and an external control signal by adding an internal buffer circuit which inputs an external hardware control signal to a buffer part and outputs an internal hardware control signal. CONSTITUTION:Two-phase reference clocks phi1 and phi2 for control which are generated by a clock generator 3 are inputted to the external buffer circuit 4 of the buffer part 6 and outputted as two-phase reference clocks CLK1 and CLK2 for in-circuit emulator design and also supplied to an instruction fetching unit 8 with an internal instruction queue through an internal buffer circuit 5. The strict specification of an operation display signal SB indicating the operation of an instruction queue obtained at an output terminal TB through an output buffer 11 is therefore calculated for the design clocks CLK1 and CLK2. Consequently, the strict specification is obtained between signals having mutual casual relation with a control signal for respective hardware control signals in the device which are sent out. |
