| 摘要 |
A RAM diagnosis device sequentially generates a state bit indicating any one of states of kinds of processing; selects processing referring to the state bit. The devices then writes a first data pattern in all areas of the RAM when writing processing is selected, and writes a second data pattern obtained by inverting the first data pattern in all the areas of the RAM when the writing processing is selected. The first data pattern is binary data. The device also reads out the first or the second data pattern from all the areas of the RAM to detect an error when error check processing is selected after each of the kinds of writing processing.
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