| 摘要 |
PURPOSE:To inspect easily a retrying function in case when an intermittent fault and a fixed fault are generated, by providing a pseudo error generation frequency register and a subtraction counter, and controlling the generation frequency of a pseudo error. CONSTITUTION:A pseudo error generation frequency register PECOUNT11 is a register which can be written from an external device, and holds the generation frequency of a pseudo error. Bits 0-3 are connected to a subtraction counter 12, are updated by -1 each by an output signal from an AND gate 15, and the pseudo error is generated until all the bits become ''0''. A detecting circuit 13 turns on a signal GE1 when it is detected that the pseudo error generation frequency indicated by the register 11 exceeds ''1''. While the signal GE1 is on, AND gates 31-3n send pseudo error signals PE1-PEn to circuits 41-4n. Also, the signal GE1 is supplied to one terminal of the gate 15. A detecting circuit 14 detects that the pseudo error generation frequency indicated by the register 11 is ''1'', turns on a signal EQ1, and it is supplied to one terminal of an AND gate 16. |
