| 摘要 |
PURPOSE:To correct the writing errors with an arithmetic processor by performing rewriting to a register in response to the detection of errors. CONSTITUTION:A microinstruction stored in a microinstruction register 5 is executed in three machine cycles. That is, the data is read out of a register memory 4 and stored in the 1st and 2nd registers 1 and 2 respectively in the 1st and 2nd cycles. Then the operations of the registers 1 and 2 are carried out by an arithmetic device 8 to write the data to a memory 40 by a clock CLK. The next microinstruction is also carried out in three machine cycles. In this case, the previous output of the device 8 is still held. While the data written to the memory 40 is read out and supplied to a comparator 42 to be compared with the output of the device 8. When the coincidence is obtained, it is decided that the writing is carried out correctly. Thus no rewriting is performed. While 1 is delivered when no coincidence is obtained, and the rewriting is carried out with a fixed delay of time. Thus a writing error is corrected. |
