| 摘要 |
<p>PURPOSE:To smoothly deal with needs by selecting one of plural memory planes and switching access by a row or column scan optionally for the selected plane. CONSTITUTION:A row scanning decoding circuit 4 and a column scanning decoding circuit 5 select (n) memory cells in rows and columns specified based on an external address signal AD2 for an optional memory cell plane in a memory cell array 1 which has memory cell planes in (n) rows and (n) columns selected by a plane selecting circuit 2 with an external address signal AD1. Further, a switching circuit 5 selects the circuit 3 or 4 according to a specific signal level to select row or column units to be scanned for the selected memory cell plane.</p> |
