| 摘要 |
PURPOSE:To improve reliability for an error check function, by generating intentionally an error on the data read out from a memory, and supplying it to an error detection circuit. CONSTITUTION:A parity error generating device 30 is provided between a parity bit memory 1, and a parity bit generation/parity error detection circuit 5. The error is generated intentionally on the data read out from the parity bit memory 1 by the parity error generating device 30. In this time, it is decided that the parity bit generation/parity error detection circuit 5 is out of order, if no error is detected by the parity bit generation/parity error detection circuit 5. |
