| 摘要 |
PURPOSE:To obtain a correct result with a small number of cycles by providing an input/output information switching means and a logical arithmetic control means, and switching a logical arithmetic unit to another nondefective unit when an error generated in said unit. CONSTITUTION:When an error occurs to a logical arithmetic unit ALU21, an error detecting circuit ALUCK51 for logical arithmetic unit transmits an error signal ALUERB0 to a logical arithmetic control part ALCONT1. Then the ALCONT1 executes a recovery cycle. That is, the ALCONT1 controls multiplexers MPX43, 44 and 45 and a carry CRY62 to select a terminal B and a COB1 and uses an ALU22 in place of the ALU21 to execute the operation of B0. In such a way, an arithmetic unit having an error is switched to another nondefective unit. Thus a correct result is obtained with a small number of cycles. |
