Controller and memory system
A controller includes an Error Correction Code (ECC) encoder adding a first parity to data to generate a data set, and encoding the data set to generate a first parity data set, a buffer temporarily storing the first parity data set, an ECC decoder decoding the first parity data set received from the buffer to generate a decoded data set, a first checker performing a Low Density Parity Check (LDPC) encoding on the decoded data set to generate an LDPC data set to which a second parity is added, and a second checker performing a syndrome check operation on the LDCP data set including the first and second parities.
1. An operating method for a controller of a memory device, the method comprising:
receiving, from a host, a write request of data;
adding a parity to the data to obtain a first data set including the parity;
performing an ecc encoding operation to obtain a data set by adding an ecc parity to the first data set;
performing an ecc decoding operation on the data set;
performing an Idpc encoding operation by adding an Idpc parity to the first data set to obtain a second data set which includes the parity and the Idpc parity; and
transferring, to the memory device, the second data set according to a result of a syndrome check operation using the ecc parity on the second data set.
2. The method according to claim 1 ,
wherein the transferring the second data set comprises transferring the second data set when the syndrome check operation on the second data set passes.
3. The method according to claim 1 ,
wherein the transferring the second data set comprises searching for a check node value to make the syndrome check operation pass when the syndrome check operation on the second data set fails.
4. The method according to claim 1 , further comprising:
storing the data set in a buffer.
5. The method according to claim 4 , further comprising:
maintaining the data set in the buffer until the second data set is stored in the memory device.
6. The method according to claim 4 , wherein the buffer includes at least one of a volatile memory or a non-volatile memory.
7. The method according to claim 1 , further comprising:
encrypting the first data set using a Data Encryption Standard (DES) algorithm or an Advanced Encryption Standard (AES) algorithm.
8. The method according to claim 1 , wherein the parity is used for a cyclic redundancy check of data.
9. The method according to claim 1 , wherein the first data set is composed of a first bit number and the second data set is composed of a second bit number greater than the first bit number.
10. An operating method for a controller of a memory device, the method comprising:
receiving, from a host, a write request of data;
producing sets of data including a parity and a Idpc parity by performing an Idpc encoding operation;
transferring the sets of data to the memory device;
receiving, from the host, a read request of the data;
receiving, from the memory device, the sets of data;
restoring the data by performing an Idpc decoding operation;
transferring the data to the host,
wherein the producing sets of data comprises:
adding a parity to the data to obtain a first data set;
adding an ecc parity to the first data set to obtain a data set;
decoding the data set to remove the ecc parity from the data set;
encoding the data set to obtain a second data set which includes the parity and the Idpc parity; and
checking the second data set by performing a syndrome check operation using the ecc parity.
11. The method according to claim 10 ,
wherein the producing sets of data further comprises storing the data set in a buffer and maintaining the data set in the buffer until the sets of data are stored in the memory device.
12. The method according to claim 11 ,
wherein the producing sets of data further comprises encrypting the first data set using a Data Encryption Standard (DES) algorithm or an Advanced Encryption Standard (AES) algorithm.
13. The method according to claim 10 ,
wherein the parity is used for a cyclic redundancy check of data.
14. The method according to claim 10 , wherein the first data set is composed of a first bit number and the second data set is composed of a second bit number greater than the first bit number.
15. The method according to claim 10 ,
wherein the restoring the data by performing the Idpc decoding operation comprises:
performing the Idpc decoding operation on the sets of data to obtain decoded data by removing the Idpc parity;
performing an ecc encoding operation to obtain a data set by adding an ecc parity to the decoded data;
performing an ecc decoding operation on the data set by removing the ecc parity; and
performing a decoding operation to obtain the data by removing the parity from the decoded data.
16. The method according to claim 15 ,
wherein the restoring the data further comprises storing the data set in a buffer and maintaining the data set in the buffer until the transferring the data to the host is completed.
17. The method according to claim 15 ,
wherein the restoring the data further comprises decrypting the decoded data using a Data Encryption Standard (DES) algorithm or an Advanced Encryption Standard (AES) algorithm.