Method and circuit for erasing a non-volatile memory cell
View Patent ↗The present invention is a method, circuit and system for erasing a non-volatile memory cell. A shunting element (e.g. transistor) may be introduced and/or activated between bit-lines to which one or more NVM cells being erased are connected. The shunting element may be located and/or activated across two bit-lines defining a given column of cells, where one or a subset of cells from the column may be undergoing an erase operation or procedure. The shunting element may be located, and/or activated, at some distance from the two bit-lines defining the given column of cells, and the shunting element may be electrically connected to the bit-lines defining the column through select transistors and/or through global bit-lines.
1. A method of erasing a subset of non-volatile memory cells (“NVM”) within a column segment of NVM cells having a first bit-line connected a first terminal of the NVM cells and a second bit line connected to the second terminal of the NVM cells, said method comprising:
shunting through a shunting element the first bit-line to the second bit-line substantially concurrently to applying an erase voltage to a gate terminal of the subset of NVM cells to be erased.
2. The method according to claim 1 , wherein shunting the first bit-line to the second bit-line includes activating a shunting element located on the same column as the sub-set of cells.
3. The method according to claim 1 , wherein shunting the first bit-line to the second bit-line includes activating a shunting element located outside the same column as the sub-set of cells.
4. The method according to claim 3 , further comprising electrically connecting the shunting element located outside the same column as the sub-set of cells with the same column as the sub-set of cells through one or more select transistors.