| 摘要 |
PURPOSE:To reduce the amount of hardware, by providing a register which holds a pair of an error address and a corrected micro instruction word when a recoverable error is detected and comparing an error address with the value held in this register when an unrecoverable error is detected and writing the corrected micro instruction word again if they coincide with each other. CONSTITUTION:When a one-bit error is detected by a means ECC, a fixed error holding register 6 holds a pair of the current value of a micro instruction counter 2 and corrected data. When a two-bit error is detected, the current value of the micro instruction counter 2 is compared with the error address held in the register 6; and if they coincide with each other, corrected data held in the register 6 is written again. Thus, the two-bit error which cannot be recovered only with an error correction code can be corrected. |
