Semiconductor memory
A plurality of memory cell arrays Array 0 , Array 1 , Array 2 , Array 3 , Array 4 , Array 5 , Array 6 and Array 7 which can perform a parallel operation are arranged in a later generation chip. Each of the memory cell arrays Array 0 and Array 4 , the memory cell arrays Array 1 and Array 5 , the memory cell arrays Array 2 and Array 6 , and the memory cell arrays Array 3 and Array 7 constitutes one cell array group. A Pass/Fail signal indicative of success or failure of the operation is outputted in accordance with each cell array group. It is good to make the number of cell array groups equal to the number of memory cell arrays or the number of cell array groups of a precedent generation chip.
1. A semiconductor memory device comprising:
a plurality of memory cell arrays having a plurality of memory cells or memory cell units each of which include a plurality of memory cells, arranged in a matrix, the plurality of memory cell arrays being located independently of each other;
a first memory cell array included in the plurality of memory cell arrays;
a second memory cell array included in the plurality of memory cell arrays;
a third memory cell array included in the plurality of memory cell arrays;
a fourth memory cell array included in the plurality of memory cell arrays;
a first memory cell array group including the first memory cell array and the second memory cell array; and
a second memory cell array group including the third memory cell array and the fourth memory cell array,
wherein the first memory cell array, the second memory cell array, the third memory cell array and the fourth memory cell array are different from one another, a first Pass/Fail signal indicative of success or failure of an operation is outputted in accordance with each of the first memory cell array group and the second memory cell array group.
2. The semiconductor memory device according to claim 1 , wherein the operation includes a parallel operation with respect to both of memory cells in the first memory cell array group and memory cells in the second memory cell array group.
3. The semiconductor memory device according to claim 1 , wherein the operation includes a parallel operation with respect to memory cells in two or more of the plurality of memory cell arrays.
4. The semiconductor memory device according to claim 1 , wherein the operation is a program or erase operation.
5. The semiconductor memory device according to claim 1 , wherein the first Pass/Fail signal is a Pass/Fail signal indicating whether the operation has attained success with respect to all of selected memory cells included in each of the first memory cell array group and the second memory cell array group or not.
6. The semiconductor memory device according to claim 1 , wherein a second Pass/Fail signal of an entire chip is also outputted when the first Pass/Fail signal is outputted.
7. The semiconductor memory device according to claim 1 , wherein the first Pass/Fail signal is a Pass/Fail signal indicating whether the operation has attained success with respect to one memory cell array selected from the two or more memory cell arrays in each of the first memory cell array group and the second memory cell array group or not.
8. The semiconductor memory device according to claim 1 , wherein the first Pass/Fail signal is outputted after a first command is inputted.
9. The semiconductor memory device according to claim 8 , wherein the first Pass/Fail signal is not outputted and a third Pass/Fail signal which is different from the first Pass/Fail signal is outputted after a second command is inputted.
10. The semiconductor memory device according to claim 8 , wherein a fourth Pass/Fail signal is outputted with respect to each of the memory cell arrays included in an entire chip after a third command is input.
11. The semiconductor memory device according to claim 10 , wherein the third command is different from the first command.
12. The semiconductor memory device according to claim 1 ,
wherein the memory cell is EEPROM.
13. The semiconductor memory device according to claim 1 , wherein the memory cell unit is a NAND cell type EEPROM.
14. A semiconductor memory device comprising:
a plurality of memory cell arrays having a plurality of memory cells or memory cell units each of which includes a plurality of memory cells, arranged in a matrix, the plurality of memory cell arrays being located independently of each other;
a first memory cell array included in the plurality of memory cell arrays;
a second memory cell array included in the plurality of memory cell arrays;
a third memory cell array included in the plurality of memory cell arrays;
a fourth memory cell array included in the plurality of memory cell arrays;
a first memory cell array group including the first memory cell array and the second memory cell array; and
a second memory cell array group including the third memory cell array and the fourth memory cell array,
wherein the first memory cell array, the second memory cell array, the third memory cell array and the fourth memory cell array are different from one another, and first Pass/Fail signals, each of which indicates success or failure of an operation of a respective one of the first memory cell array group and the second memory cell array group, are outputted.
15. The semiconductor memory device according to claim 14 , wherein the operation includes a parallel operation with respect to both of memory cells in the first memory cell array group and memory cells in the second memory cell array group.
16. The semiconductor memory device according to claim 14 , wherein the operation includes a parallel operation with respect to memory cells in two or more of the plurality of memory cell arrays.
17. The semiconductor memory device according to claim 14 , wherein the operation is a program or erase operation.
18. The semiconductor memory device according to claim 14 , wherein the first Pass/Fail signal is a Pass/Fail signal indicating whether the operation has attained success with respect to all of selected memory cells included in each of the first memory cell array group and the second memory cell array group or not.
19. The semiconductor memory device according to claim 14 , wherein a second Pass/Fail signal of an entire chip is also outputted when the first Pass/Fail signal is outputted.
20. The semiconductor memory device according to claim 14 , wherein the first Pass/Fail signal is a Pass/Fail signal indicating whether the operation has attained success with respect to one memory cell array selected from the two or more memory cell arrays in each of the first memory cell array group and the second memory cell array group.
21. The semiconductor memory device according to claim 14 , wherein the memory cell unit is a NAND cell type EEPROM.