| 摘要 |
<p>PURPOSE: To withstand a number of times of reading/erasing and to improve the reliability by constituting an array of on-chip EEprom cells in sectors and simultaneously erasing all cells contained in each such cell. CONSTITUTION: Each having an array of flash EEprom cells, the array is divided into plural sectors, with each sector provided with one or more integrated circuit chips that are addressable so as to erase simultaneously all cells contained in the sector. In addition, a means for selecting plural sectors from one or more chips for an erasing operation is provided, as is a means for carrying out simultaneous erasure only for the selected sectors. Consequently, reliability can be improved.</p> |
