Apparatuses and methods for performing an exclusive or operation using sensing circuitry
The present disclosure includes apparatuses and methods related to determining an XOR value in memory. An example method can include performing a NAND operation on a data value stored in a first memory cell and a data value stored in a second memory cell. The method can include performing an OR operation on the data values stored in the first and second memory cells. The method can include performing an AND operation on the result of the NAND operation and a result of the OR operation without transferring data from the memory array via an input/output (I/O) line.
1. An apparatus, comprising:
an array of memory cells coupled to a sense line;
sensing circuitry comprising a sense amplifier and a compute component coupled to the sense line, wherein the sense amplifier comprises a primary latch and the compute component comprises a secondary latch; and
control circuitry configured to use the sense amplifier and the compute component to perform an XOR operation on data stored in the array, wherein the XOR operation includes:
a first logical operation performed, using the primary latch and the secondary latch, on a data value stored in a first memory cell coupled to a first access line and a data value stored in a second memory cell coupled to a second access line;
a second logical operation performed, using the primary latch and the secondary latch, on the data values stored in the first and second memory cells; and
a third logical operation performed, using the primary latch and the secondary latch, on a resultant value of the first logical operation and a resultant value of the second logical operation.
2. The apparatus of claim 1 , wherein the control circuitry is configured to use the sensing circuitry to:
perform the first logical operation by performing a NAND operation;
perform the second logical operation by performing an OR operation; and
perform the third logical operation by performing an AND operation.
3. The apparatus of claim 1 , wherein the control circuitry is configured to use the sensing circuitry to perform the XOR on the data without transferring the data out of the array via an input/output line.
4. The apparatus of claim 1 , wherein the control circuitry is configured to provide control signals to the sensing circuitry to perform the XOR operation.
5. The apparatus of claim 1 , further comprising a host configured to provide instructions executed by the control circuitry configured to provide control signals to the sensing circuitry to perform the XOR operation.
6. The apparatus of claim 1 , wherein the sensing circuitry comprises the sense amplifier and the compute component coupled to a pair of complementary sense lines comprising the sense line and a complementary sense line.
7. The apparatus of claim 6 , wherein the control circuitry is configured to send a number of control signals to cause, in association with performing the first logical operation:
loading the second latch of the compute component with a first data value;
performing an AND operation on the first data value and a second data value by enabling the second access line and only one of a first pass transistor coupled to one of the pair of complementary sense lines and a second pass transistor couple to the other of the pair of complementary sense lines which results in a resultant value of the AND operation being stored in the compute component; and
inverting the resultant value of the AND operation stored in the compute component which results in the compute component storing a resultant value of the first logical operation.
8. The apparatus of claim 7 , wherein the control circuitry is further configured to send a number of control signals to cause, in association with performing the first logical operation, loading the compute component by enabling the second access line, the first pass transistor, and the second pass transistor.
9. The apparatus of claim 6 , wherein the control circuitry is configured to send a number of control signals to cause, in association with performing the third logical operation:
enabling an access transistor corresponding to a third memory cell; and
activating only one of a first pass transistor coupled to one of the pair of complementary sense lines and a second pass transistor couple to the other of the pair of complementary sense lines which results in a resultant value of the third logical operation being stored in the compute component.
10. The apparatus of claim 6 , wherein the control circuitry is configured to send a number of control signals to cause, in association with performing the second logical operation:
loading the compute component coupled to the sense line with the data value stored in the first memory cell; and
enabling an access transistor corresponding to the second memory cell and activate only one of a pass transistor coupled to the sense line and a pass transistor coupled to the complementary sense line which results in a resultant value of the second logical operation being stored in the compute component.
11. The apparatus of claim 10 , wherein the control circuitry is further configured to send a number of control signals to cause, in association with performing the third logical operation, copying a resultant value of the third logical operation from the compute component to a third memory cell coupled to a third access line by enabling an access transistor corresponding to the third memory cell while activating both of a first and a second pass transistor.
12. The apparatus of claim 1 , wherein the first and second access lines are different access lines.