Semiconductor memory device and operating method thereof

1. A semiconductor memory device, comprising:

at least two memory blocks commonly connected to a block decoder sharing one block word line;

a peripheral circuit configured to perform an erase operation of a selected memory block among the at least two memory blocks; and

a control logic configured to control the peripheral circuit to transfer an erase voltage applied to a source line commonly connected to the at least two memory blocks to bit lines connected to the selected memory block using at least one shared block,

wherein the at least one shared block is at least one memory block other than the selected memory block among the at least two memory blocks, and

wherein the block decoder comprises a pass transistor connected between a plurality of global lines and a plurality of local lines of the at least two memory blocks, respectively.

2. The semiconductor memory device of claim 1 ,

wherein the control logic is configured to control the peripheral circuit to connect the at least one shared block to the source line for a predetermined time period while the erase voltage applied to the source line.

3. The semiconductor memory device of claim 1 ,

wherein the control logic is configured to control the peripheral circuit to float a local line of the shared block among the plurality of local lines according to a voltage applied to the one block word line.

4. The semiconductor memory device of claim 1 ,

wherein a gate electrode of the pass transistor is connected to the one block word line.

5. The semiconductor memory device of claim 4 ,

wherein the control logic is configured to control the peripheral circuit to apply a first voltage which is higher than a turn-on voltage of the pass transistor to the one block word line and to apply a third voltage higher than the first voltage to a global line of the shared block.

6. The semiconductor memory device of claim 5 ,

wherein the control logic is further configured to control the peripheral circuit to discharge the one block word line to the turn-on voltage and to discharge the global line of the shared block to a fourth voltage higher than the turn-on voltage.

7. The semiconductor memory device of claim 6 ,

wherein the control logic is further configured to control the peripheral circuit to connect the selected block to the source line after the one block word line is discharged to the turn-on voltage.

8. A method for operating a semiconductor memory device including a pass transistor which connects a plurality of global lines to a plurality of local lines of at least two memory blocks in response to a voltage applied to a block word line, the method comprising:

applying an erase voltage to a source line commonly coupled to the at least two memory blocks; and

transferring the erase voltage applied to a source line to bit lines connected to a selected memory block among the at least two memory blocks using at least one shared block,

wherein the at least one shared block is at least one memory block other than the selected memory block among the at least two memory blocks, and

wherein the transferring the erase voltage comprises connecting the at least one shared block to the source line for a predetermined time while the erase voltage is applied to the source line.

9. The method of claim 8 , wherein the transferring the erase voltage comprises increasing a voltage level of the plurality of local lines of the at least one shared block for a predetermined time while the erase voltage is applied to the source line.

10. The method of claim 8 , wherein the transferring the erase voltage comprises:

applying a first voltage which is higher than a turn-on voltage of the pass transistor to the block word line; and

apply a third voltage higher than the first voltage to a global line of the shared block.

11. The method of claim 10 , further comprising:

discharging the block word line to the turn-on voltage and the global line of the shared block to a fourth voltage higher than the turn-on voltage, respectively.

12. The method of claim 11 , further comprising:

connecting the selected block to the source line after the block word line is discharged to the turn-on voltage.

13. A semiconductor memory device, comprising:

a memory cell array including at least two memory blocks sharing one block word line and a transfer block coupled to the memory blocks through bit lines;

a peripheral circuit configured to perform an erase operation on a selected memory block of the memory blocks; and

a control circuit configured to control the peripheral circuit to apply a first positive voltage to the block word line and a block word line corresponding to the transfer block and a second positive voltage higher than the first positive voltage to a global word line of the unselected memory block of the memory blocks when an erase voltage is applied to a source line commonly coupled to the memory blocks,

wherein the first positive voltage has a level to turn on pass transistors coupled to the block word line of the memory blocks and the block word line corresponding to the transfer block.

14. The semiconductor memory device of claim 13 , wherein the control circuit further applies a ground voltage to the block word line corresponding to the transfer block when a predetermined time passes.

15. The semiconductor memory device of claim 13 , wherein the transfer block is a memory block other than main blocks among a plurality of memory blocks included in the memory cell array.

16. The semiconductor memory device of claim 13 , wherein the transfer block stores system information about a plurality of memory blocks included in the memory cell array.

17. The semiconductor memory device of claim 13 , wherein the transfer block is a repair block among a plurality of memory blocks included in the memory cell array.