Semiconductor device and programming method
View Patent ↗The semiconductor device of the present invention includes a column decoder (select and write circuit), which selects multiple pages that are not located adjacently to each other so as to simultaneously program multiple bits in the memory cells of the selected page, when the multiple bits are programmed in the multiple pages. The page is a selection unit and is composed of a given number of the memory cells located on a same word line. An unnecessary stress of programming is not applied to the memory cells that are not to be programmed, by increasing the distance between the memory cells to be programmed simultaneously.
1. A semiconductor device comprising:
word lines;
bit lines;
non-volatile memory cells connected to the word lines and the bit lines. pages being defined for each of the word lines, each of the pages having a given number of non-volatile memory cells; and
a select and write circuit selecting pages that are not adjacent to each other and simultaneously programming memory cells of the pages thus selected, further comprising a programming level equalizing circuit generating dummy programming current equal to programming current through the number of memory cells that are not programmed among simultaneously programmable memory cells.
2. The semiconductor device as claimed in claim 1 , wherein:
the pages include even-numbered pages and odd-numbered pages related to one of the word lines; and
the select and write circuit programs the non-volatile memory cells of the even- or odd-numbered pages first and programs the non-volatile memory cells of the odd- or even-numbered pages second.
3. The semiconductor device as claimed in claim 1 , wherein the select and write circuit sets bit lines connected to memory cells of pages that are not programmed to a floating state.
4. The semiconductor device as claimed in claim 1 , wherein:
the semiconductor device has blocks related to one of the word lines, and each of the blocks has a given number of pages;
the semiconductor device has a first mode in which one of the given number of pages in each of the blocks is simultaneously programmed, and a second mode in which even- or odd-numbered pages in each of the blocks are simultaneously programmed; and
the semiconductor device comprises a control circuit that causes the select and write circuit to operate in one of the first and second modes in accordance with an external command applied to the semiconductor device.
5. The semiconductor device as claimed in claim 1 . Further comprising a high. voltage generating circuit generating a high voltage for programming the non-volatile memory cells, wherein the select and write circuit activates selected bit lines using the high voltage generated by the high-voltage generating circuit.