| 摘要 |
<p>PURPOSE:To perform a memory access check by storing a flag which shows data characteristics corresponding to the data address of a channel prior to memory access, and then comparing it with a flag for the memory access. CONSTITUTION:A control part 4, once receiving a memory access command by a data transfer interface signal D sent from each channel, sends a signal E for selecting a data address to a storage circuit 1. The storage circuit 1 sends a flag, which corresponds to the data address of a necessary channel number, out of a flag storage part 10. A data address signal F is inputted directly to a storage part 5 to handle data according to the data address signal F. A flag output signal A is supplied to one input terminal of a comparing circuit 11. The control part 4 sends the flag signal B of the data address to the comparing circuit 11. The comparing circuit 11 compares the signal A to the signal B and, if there is a difference between the both, sends a detection signal C, thus recognizing the error.</p> |
