| 摘要 |
PURPOSE:To detect accurately the malfunction of a storage address driving circuit even if a storage address including ECC checking method, by driving storage address information, which are given to plural storage parts constituting a word, with one storage address driving circuit. CONSTITUTION:When a storage address driving circuit 1 of a certain storage block 10 is driven by a start signal, input storage address information are supplied to individual storage parts 2 in the block 10 at a time, and word information of total 39 bits (one word) consisting of a 32-bit data part and a 7-bit check bit part is read out. Simultaneously, input storage address information are supplied to a parity bit generating circuit 20 to generate a parity bit corresponding to them. This parity bit, data read out from the block 10, and check bits are given to a storage address including ECC error detecting circuit 30, and a one-bit error of data, a storage address error, and a multi-bit error are detected. That is, even if the storage address including ECC (error detecting check bit) checking method is applied, the malfunction of the circuit 1 is detected accurately. |
