Patent ID: 7227779
Filing Date: 2007-06-05
Classification: G11C,H01L

Abstract:
1. A method for accessing a selected storage location in a selected bidirectional memory cell within a memory containing a plurality of diffused lines, each diffused line forming source/drain regions for a column of bidirectional memory cells, the method comprising: decoding a column address to identify a selected overlying line from a plurality of overlying lines and identify a direction for a current though the selected bidirectional memory cell; selecting a first level for a first voltage and second level for a second voltage based on the direction for the current; biasing all of the overlying lines that are on a first side of the selected overlying line at the first voltage and all of the overlying lines that are on a second side of the selected overlying line at the second voltage; and activating first bank select cells that are at a first end of the bank or second bank select cells that are at a second end of the bank depending on whether the column address indicates a selected bidirectional memory cell is in an even or odd column of a selected bank, wherein each first bank select cell when activated connects a corresponding one of the overlying lines to a pair of the diffused lines, and each second bank select cell when activated connects a corresponding one of the overlying lines to a pair of the diffused lines.