| 摘要 |
PURPOSE:To track an error, by latching previously an address signal and a strobe signal which are fed to a memory device from a CPU, then reading out the latched signal by an interruption signal when a ready signal is not fed back within a specified time. CONSTITUTION:An address signal and a strobe signal of R/W are sent to a memory device 8 from a CPU1, and at the same time the data is latched 2 previously. When no ready signal is fed back within a fixed time, a monostable multivibrator 7 has a reverse operation. Then an interruption signal INT is fed to the CPU1 from a controller 6 by an output TO. The CPU1 uses a decoder 3 to open a gate 4 and reads the contents held at the latch 2 to obtain an address data that causes an error. Thus it is possible to trace the error. |
