| 摘要 |
PURPOSE:To attain quick error detection in response to an error rate without increasing a circuit scale by making a timer monitoring period variable. CONSTITUTION:An error counting circuit 12 counts the output pulse of an error detection circuit 10 and outputs an output pulse to a protective stage number setting circuit 14 when the count is a set value or above. When the count of the error counting circuit 12 reaches the set count and the circuit 12 generates the output pulse, the output resets a time monitoring circuit 16 via a resetting circuit 18 to restart the counting. The setting circuit 14 is reset when the time monitoring circuit 16 gives a reset pulse to the error counting circuit 12 at a scheduled time. As an error rate is increased, the output of an error detection signal is faster to attain quick error detection. |
