| 摘要 |
PURPOSE:To check the titled timing signal in a no-operation time by providing a register which shifts an operation command at the timing of a machine cycle and generating a NP timing check signal when the register is not busy. CONSTITUTION:A timing circuit 110 generates timing signals related to reading and writing operations, etc. based on an operation command CMD. A command shift register circuit 120 shifts successively the input state of the command CMD at each shift stage. A busy checking circuit 130 generates the NP timing check signal which checks the timing signals related to the no-operation when the circuit 120 is not busy. A timing check circuit 140 checks the timing signal related to the no-operation when the NP timing signal is received.
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