| 摘要 |
PURPOSE:To discriminate an LSI of the trouble occurrence source by providing a clock machine which stops update at the time of trouble detection and stopping update also at the time of trouble detection in the other highly integrated circuits constituting a device. CONSTITUTION:Highly integrated circuits LSI 1 and LSI 2 are provided with counters 1 and 2 which simultaneously count a clock (CLK) synchronously with each other. If the counting operation of the counter 1 is stopped by trouble detection in the LSI 1 and the counted value at this time is '00100', pertinent trouble data is propagated to the LSI 2 and trouble is detected similarly, and the counter 2 counts one clock extra and is stopped with counted value '00101' when the counting operation of the counter 2 in the LSI 2 is stopped. Since counting operations of counters 1, 2... in LSIs 1, 2... constituting the device are stopped when a freeze signal is sent from a trouble freezing circuit of the device including LSIs 1, 2... in this state, it is recognized that trouble first occurs in the LSI 1. |
