Semiconductor memory device having two-dimensional matrix array
First Claim
1. A semiconductor memory device having a memory cell matrix in which a plurality of memory cells are connected in rows by word lines and in columns by bit lines, a row selection decoder for activating an arbitrary cell row by a row address signal, and a column selection decoder for selecting desired cell arranged in a desired cell row activated by said row selection decoder so as to access a specified memory cell, the memory device comprising:
- first row-address signal lines provided along one side of said memory cell matrix having a rectangular shape and for supplying a first row address signal to a cell group row selector;
said cell group row selector having a plural number of decoder circuits, one of which is selected by said first row address signal;
a plural number of cell row groups, each connected to a corresponding decoder circuit by a corresponding first word line and being activated by a cell group row activation signal from said decoder circuit when that decoder circuit is selected;
each cell row group having a plural number of cell groups having a plural number of cell rows;
second row-address signal lines positioned inside a boundary line of an area treated as said memory matrix and connected to a plural number of decoders symmetrically arranged in each cell group connected vertically by the second row-address signal line; and
said cell rows symmetrically connected to corresponding decoders by corresponding second word lines and activated by cell row activation signals from corresponding decoders when those corresponding decoders are activated.
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Abstract
A semiconductor memory device has a memory cell matrix in which a plurality of memory cells are connected in rows by work lines and in columns by bit lines. The device comprises cell row groups each of which is formed by memory cell rows commonly activated by several row address signals at a first selection stage, a row group selection decoder having the smallest decoding circuits as a first stage decoder each connected to the row group(s) by first stage word line and commonly activating any group(s) at the first row selection stage by several row address signals, and a row selection decoder as a second stage decoder having the smallest decoding units entirely provided in the matrix and each activating any cell row(s) at a second selection stage by remaining row address signals.
11 Citations
7 Claims
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1. A semiconductor memory device having a memory cell matrix in which a plurality of memory cells are connected in rows by word lines and in columns by bit lines, a row selection decoder for activating an arbitrary cell row by a row address signal, and a column selection decoder for selecting desired cell arranged in a desired cell row activated by said row selection decoder so as to access a specified memory cell, the memory device comprising:
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first row-address signal lines provided along one side of said memory cell matrix having a rectangular shape and for supplying a first row address signal to a cell group row selector; said cell group row selector having a plural number of decoder circuits, one of which is selected by said first row address signal; a plural number of cell row groups, each connected to a corresponding decoder circuit by a corresponding first word line and being activated by a cell group row activation signal from said decoder circuit when that decoder circuit is selected; each cell row group having a plural number of cell groups having a plural number of cell rows; second row-address signal lines positioned inside a boundary line of an area treated as said memory matrix and connected to a plural number of decoders symmetrically arranged in each cell group connected vertically by the second row-address signal line; and said cell rows symmetrically connected to corresponding decoders by corresponding second word lines and activated by cell row activation signals from corresponding decoders when those corresponding decoders are activated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification