| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the number of registers for controlling sector erasure of a memory device and reduce the number of steps for performing the sector erasure. SOLUTION: A relationship between each address terminal and an erasure sector is such that, for example, when a first address terminal S3001 is at 'H', a first erasure sector 1601 is erased in accordance with an erasure operation signal S4. For example, in the case where an erasure operation is performed for erasure sectors 1602-1605, an 'H' level is first input to address terminals S3002-$3005 which correspond to sectors to be erased in an address bus B20, thereby setting the erasure operation signal S4 to be active ('H'). Thus, a signal is output to erasure sector control signal buses B5 all of which were at a non-active condition ('L'), thereby performing the erasure operation for the erasure sectors 1602-1605.</p> |
