| 摘要 |
PROBLEM TO BE SOLVED: To provide a system that expands the range of failure detection for internal states of a processor so as to shorten time from the occurrence of a failure to the detection of the failure.SOLUTION: A failure detection system includes: JTAG-compliant first and second processors (101A and 101B); and a processor monitoring JTAG controller (105) that generates JTAG signals for monitoring the processors during normal operation and that commonly and parallelly inputs monitoring TDI-signals to the first and second processors (101A and 101B); and a TDO signal comparison circuit (103) that receives TDO signals that are parallelly output from the first and second processors (101A and 101B), compares them with each other and, if a mismatch is detected, brings a processor failure notification signal into an active state. |
