| 摘要 |
PURPOSE:To specify in which local bus a parity error occurs when the bus parity error occurs in bus constitution having plural local buses. CONSTITUTION:Parity C/G control parts 4-1 to 4-3 are provided for respective local buses. When the parity error is detected, a BERR line 102 is made active for CPU 1. When the BERR line 102 becomes active, CPU 1 outputs addresses which are previously allocated to respective local buses are outputted to an AM line 101 and detects the signal state change of the BERR line 102. When the C/G control parts 4-1 to 4-3 of the respective local buses detect that the address to oneself is outputted to the AM line 102, the BEER line 102 is negated. |
