Three dimensional non-volatile storage with multi block row selection
View Patent ↗A three-dimensional array adapted for memory elements that reversibly change a level of electrical conductance in response to a voltage difference being applied across them. Memory elements are formed across a plurality of planes positioned different distances above a semiconductor substrate. Bit lines to which the memory elements of all planes are connected are oriented vertically from the substrate and through the plurality of planes.
1. A non-volatile storage system, comprising:
a substrate;
a monolithic three dimensional memory array of memory elements positioned above and not in the substrate, the memory elements are arranged in blocks;
a plurality of word lines connected to the memory elements, the word lines are arranged as groups of connected word lines;
a plurality of global word lines, each global word line is connected to one of the groups in a block;
word line drivers in the substrate, below the memory elements and in communication with the groups;
a plurality of bit line drivers in the substrate;
a plurality of global bit lines connected to the bit line drivers;
a plurality of vertically oriented bit lines above and not in the substrate;
a plurality of select devices connected to the vertically oriented bit lines and the global bit lines, each block of memory elements is connected to a different subset of the select devices;
a plurality of row select lines, each row select line connects to a subset of the select devices for multiple blocks; and
row select line drivers in the substrate, each row select line driver drives a row select line.
2. The non-volatile storage system of claim 1 , wherein:
each row select line spans across the multiple blocks of memory elements.
3. The non-volatile storage system of claim 1 , wherein:
a fan out of one word line is greater than a fan out of one vertically oriented bit line;
a fan out of one row select line driver is greater than the fan out of one word line; and
a fan out of one global bit line and a fan out of one global word line are both greater than the fan out of one row select line driver.
4. The non-volatile storage system of claim 1 , wherein:
the plurality of select devices are vertically oriented select devices above and not in the substrate.
5. The non-volatile storage system of claim 1 , wherein:
each group of connected word lines includes word lines that connect to memory elements in two blocks.
6. The non-volatile storage system of claim 1 , wherein:
the monolithic three dimensional memory array of memory element includes memory elements on multiple levels; and
each group of connected word lines includes word lines on a common level.
7. The non-volatile storage system of claim 1 , wherein:
the groups of connected word lines form comb shapes;
the comb shapes include a spine, fingers on a first side and fingers on a second side;
a first set of the word lines of a respective group are the fingers on the first side; and
a second set of the word lines of the respective group are the fingers on the second side.
8. The non-volatile storage system of claim 1 , wherein:
the row select line drivers are positioned underneath the memory elements.
9. The non-volatile storage system of claim 1 , wherein:
the row select line drivers are positioned between blocks of memory elements.
10. The non-volatile storage system of claim 1 , wherein:
each row select line connects to subsets of the vertically oriented select devices for 128 blocks.
11. The non-volatile storage system of claim 1 , wherein:
the memory elements include multiple sets of blocks including a first set of multiple blocks;
a first subset of the row select line drivers are positioned on a first side of the first set of multiple blocks;
a second subset of the row select line drivers are positioned on a second side of the first set of multiple blocks; and
the first subset of the row select line drivers and the second subset of the row select line drivers are connected to a first set of row select lines that are connected to the vertically oriented select devices connected to vertically oriented bit lines for all of the blocks of the first set of multiple blocks.
12. The non-volatile storage system of claim 1 , wherein:
the memory elements include multiple sets of blocks including a first set of multiple blocks;
a subset of the row select line drivers are positioned in the middle of the first set of multiple blocks; and
the subset of the row select line drivers are connected to a set of row select lines that are connected to the vertically oriented select devices connected to vertically oriented bit lines for all of the blocks of the first set of multiple blocks.
13. The non-volatile storage system of claim 1 , wherein:
the memory elements include multiple sets of blocks including a first set of multiple blocks;
subsets of the row select line drivers are positioned in a distributed manner between various blocks of the first set of multiple blocks; and
the subset of the row select line drivers are connected to a set of row select lines that are connected to the vertically oriented select devices connected to vertically oriented bit lines for all of the blocks of the first set of multiple blocks.
14. A non-volatile storage system, comprising:
a substrate;
a monolithic three dimensional memory array of memory elements positioned above and not in the substrate;
a plurality of word lines connected to the memory elements, the word lines are arranged as groups of connected word lines;
a plurality of global word lines, each global word line is connected to one of the groups;
word line drivers in the substrate, below the memory elements and in communication with the groups;
a plurality of bit line drivers in the substrate;
a plurality of global bit lines connected to the bit line drivers;
a plurality of vertically oriented bit lines above and not in the substrate;
a plurality of select devices connected to the vertically oriented bit lines and the global bit lines;
a plurality of row select lines connected to the select devices; and
row select line drivers in the substrate, each row select line driver drives a row select line, a fan out of one word line is greater than a fan out of one vertically oriented bit line, a fan out of one row select line driver is greater than the fan out of one word line, and a fan out of one global bit line and a fan out of one global word line are both greater than the fan out of one row select line driver.
15. A method of operating a monolithic three dimensional memory array of memory elements positioned above and not in the substrate, the memory elements are arranged in blocks, comprising: driving signals on word lines and global bit lines; using row select line drivers to apply signals on a plurality of row select lines; activating a plurality of select devices based on the signals applied to the row select lines, each block of memory elements is connected to a different subset of the select devices, each row select line connects to a subset of the select devices for multiple blocks: and communicating signals from the global bit lines to vertically oriented bit lines above and not in the substrate using the select devices; a fan out of one word line is greater than a fan out of one vertically oriented bit line, a fan out of one row select line driver is greater than the fan out of one word line and a fan out of one global bit line and a fan out of one global word line are both greater than the fan out of one row select line driver.
16. A method of operating a monolithic three dimensional memory array of memory elements positioned above and not in the substrate, the memory elements are arranged in blocks, comprising: driving signals on word lines and global bit lines; using row select line drivers to apply signals on a plurality of row select lines; activating a plurality of select devices based on the signals applied to the row select lines, each block of memory elements is connected to a different subset of the select devices, each row select line connects to a subset of the select devices for multiple blocks, the plurality of select devices are vertically oriented select devices above and not in the substrate; and communicating signals from the global bit lines to vertically oriented bit lines above and not in the substrate using the select devices.
17. The method of claim 16 , wherein: each row select line spans across the multiple blocks of memory elements.
18. A method of operating a monolithic three dimensional memory array of memory elements positioned above and not in the substrate, the memory elements are arranged in blocks, comprising: driving signals on word lines and global bit lines; using row select line drivers to apply signals on a plurality of row select lines; activating a plurality of select devices based on the signals applied to the row select lines, each block of memory elements is connected to a different subset of the select devices, each row select line connects to a subset of the select devices for multiple blocks; and communicating signals from the global bit lines to vertically oriented bit lines above and not in the substrate using the select devices; the word lines are arranged as groups of connected word lines and each group of connected word lines includes word lines that connect to memory elements in two blocks.
19. The method of claim 18 , wherein:
the groups of connected word lines form comb shapes;
the comb shapes include a spine, fingers on a first side and fingers on a second side;
a first set of the word lines of a respective group are the fingers on the first side; and
a second set of the word lines of the respective group are the fingers on the second side.