Error detection and classification at a memory device

1 . A method for a memory device, comprising:

receiving a read command from a host device;

reading a codeword from a memory based at least in part on the read command, wherein the codeword comprises a first set of parity bits;

generating a second set of parity bits based at least in part on reading the codeword, wherein a first set of syndrome bits is based at least in part on the first set of parity bits and the second set of parity bits;

generating, at the memory device and after reading the codeword and based at least in part on the first set of syndrome bits for the codeword, a first error detection bit that indicates whether an error has been detected in the codeword;

correcting the error in the codeword based at least in part on detecting the error in the codeword;

generating a second set of syndrome bits based at least in part on the codeword and after correcting the error in the codeword;

generating, at the memory device and after generating the first error detection bit and based at least in part on the second set of syndrome bits for the codeword, a second error detection bit for the codeword that indicates whether a different error has been detected in the codeword; and

communicating, from the memory device and to the host device, the first error detection bit and the second error detection bit.

2 . The method of claim 1 , further comprising:

generating a third set of parity bits based at least in part on generating the first error detection bit, wherein the second set of syndrome bits is based at least in part on the first set of parity bits and the third set of parity bits.

3 . The method of claim 1 , further comprising:

performing a first logic operation on the first set of parity bits for the codeword and the second set of parity bits for the codeword, wherein the first set of syndrome bits is based at least in part on performing the first logic operation; and

performing a second logic operation on the first set of parity bits for the codeword and a third set of parity bits for the codeword, wherein the second set of syndrome bits is based at least in part on performing the second logic operation.

4 . The method of claim 1 , further comprising:

generating, based at least in part on the codeword, a bit that indicates whether the codeword has an even or odd quantity of logic ones; and

inverting the bit based at least in part on the first error detection bit indicating that an error has been detected in the codeword.

5 . The method of claim 4 , further comprising:

inverting the bit based at least in part on the second error detection bit indicating that a different error has been detected in the codeword; and

communicating the bit to the host device.

6 . The method of claim 1 , further comprising:

generating, based at least in part on the codeword, a bit that indicates whether the codeword has an even or odd quantity of logic ones;

inverting the bit based at least in part on the second error detection bit indicating that an error has been detected in the codeword; and

communicating the bit to the host device.

7 . A system, comprising:

a memory device configured to:

generate, at the memory device and after reading a codeword, a first error detection bit for the codeword based at least in part on a first set of syndrome bits for the codeword, wherein the first error detection bit indicates whether an error has been detected in the codeword; and

generate, at the memory device and after generating the first error detection bit, a second error detection bit for the codeword based at least in part on a second set of syndrome bits for the codeword, wherein the second error detection bit indicates whether a different error has been detected in the codeword; and

a host device configured to:

receive, at the host device and from the memory device, the first error detection bit and the second error detection bit for the codeword;

determine an error status for the codeword based at least in part on the first error detection bit and the second error detection bit for the codeword; and

enter a safety mode based at least in part on determining that the codeword has an uncorrectable error.

8 . The system of claim 7 , wherein the host device is configured to:

determine that the codeword had a correctable error based at least in part on the first error detection bit indicating that an error has been detected in the codeword and on the second error detection bit indicating that a different error has not been detected in the codeword.

9 . The system of claim 7 , wherein the host device is configured to:

determine that the codeword has the uncorrectable error based at least in part on the first error detection bit indicating that an error has not been detected in the codeword and on the second error detection bit indicating that a different error has been detected in the codeword.

10 . The system of claim 7 , wherein the host device is configured to:

determine that the codeword has the uncorrectable error based at least in part on the first error detection bit indicating that an error has been detected in the codeword and on the second error detection bit indicating that a different error has been detected in the codeword.

11 . An apparatus, comprising:

a memory; and

a controller coupled with the memory and configured to cause the apparatus to:

receive a read command from a host device;

read a codeword from the memory based at least in part on the read command wherein the codeword comprises a first set of parity bits;

generate a second set of parity bits based at least in part on reading the codeword, wherein a first set of syndrome bits is based at least in part on the first set of parity bits and the second set of parity bits;

generate, at the apparatus and after reading the codeword and based at least in part on the first set of syndrome bits for the codeword, a first error detection bit that indicates whether an error has been detected in the codeword;

correct the error in the codeword based at least in part on detecting the error in the codeword;

generate a second set of syndrome bits based at least in part on the codeword and after correcting the error in the codeword;

generate, at the apparatus and after generating the first error detection bit and based at least in part on the second set of syndrome bits for the codeword, a second error detection bit for the codeword that indicates whether a different error has been detected in the codeword; and

communicate, from the apparatus and to the host device, the first error detection bit and the second error detection bit.

12 . The apparatus of claim 11 , wherein the codeword comprises a first set of parity bits, and wherein the controller is further configured to cause the apparatus to:

generate a third set of parity bits based at least in part on generating the first error detection bit, wherein the second set of syndrome bits is based at least in part on the first set of parity bits and the third set of parity bits.

13 . The apparatus of claim 11 , wherein the controller is further configured to cause the apparatus to:

perform a first logic operation on a first set of parity bits for the codeword and a second set of parity bits for the codeword, wherein the first set of syndrome bits is based at least in part on performing the first logic operation; and

perform a second logic operation on the first set of parity bits for the codeword and a third set of parity bits for the codeword, wherein the second set of syndrome bits is based at least in part on performing the second logic operation.

14 . The apparatus of claim 11 , wherein the controller is further configured to cause the apparatus to:

generate, based at least in part on the codeword, a bit that indicates whether the codeword has an even or odd quantity of logic ones; and

invert the bit based at least in part on the first error detection bit indicating that an error has been detected in the codeword.

15 . The apparatus of claim 14 , wherein the controller is further configured to cause the apparatus to:

invert the bit based at least in part on the second error detection bit indicating that a different error has been detected in the codeword; and

communicate the bit to the host device.

16 . The apparatus of claim 11 , wherein the controller is further configured to cause the apparatus to:

generate, based at least in part on the codeword, a bit that indicates whether the codeword has an even or odd quantity of logic ones;

invert the bit based at least in part on the second error detection bit indicating that an error has been detected in the codeword; and

communicate the bit to the host device.

17 . An apparatus, comprising:

a memory configured to read a codeword stored in the memory based at least in part on a read command received from a host device, wherein the codeword comprises a first set of parity bits;

a first logic circuit configured to generate, at the apparatus, a first error detection bit for the codeword based at least in part on a first set of syndrome bits for the codeword, wherein the first error detection bit indicates whether an error has been detected in the codeword;

a correction circuit configured to correct, based at least in part on the first error detection bit indicating that an error has been detected in the codeword, the error in the codeword;

a syndrome circuit configured to generate a second set of syndrome bits based at least in part on the codeword after correcting the error in the codeword and further configured to generate a second set of parity bits based at least in part on reading the codeword, wherein the first set of syndrome bits is based at least in part on the first set of parity bits and the second set of parity bits;

a second logic circuit configured to generate, at the apparatus, a second error detection bit for the codeword based at least in part on the second set of syndrome bits for the codeword, wherein the second error detection bit indicates whether there is a different error in the codeword; and

one or more pins configured to convey, from the apparatus and to the host device, the first error detection bit and the second error detection bit.

18 . The apparatus of claim 17 , the apparatus further comprising:

a parity circuit configured to generate a third set of parity bits based at least in part on the first error detection bit, wherein the second set of syndrome bits is based at least in part on the first set of parity bits and the third set of parity bits.

19 . The apparatus of claim 17 , further comprising:

a first plurality of logic gates configured to perform a first logic operation on a first set of parity bits for the codeword and a second set of parity bits for the codeword, wherein the first set of syndrome bits is based at least in part on performing the first logic operation; and

a second plurality of logic gates configured to perform a second logic operation on the first set of parity bits for the codeword and a third set of parity bits for the codeword, wherein the second set of syndrome bits is based at least in part on performing the second logic operation.

20 . The apparatus of claim 17 , further comprising:

a circuit configured to generate, based at least in part on the codeword, a bit that indicates whether the codeword has an even or odd quantity of logic ones; and

an inverter configured to invert the bit based at least in part on the first error detection bit indicating that an error has been detected in the codeword.