Samsung S5PC100, User Manual, Page: 476 / 1863

S5PC100 USER’S MANUAL (REV1.0) NAND FLASH CONTROLLER
5.4-11
5.7 8-BIT ECC PROGRAMMING GUIDE (ENCODING)
1. To use 8-bit ECC in software mode, set the MsgLength to 0 (512-byte message length) and set the ECCType
to “01” (enable 8-bit ECC). The ECC module generates ECC parity code for 512-byte write data. Therefore
reset ECC value by writing the InitMECC (NFCONT[5]) bit as ‘1’ after clearing the MainECCLock
(NFCONT[7]) bit to ‘0’(Unlock) .
MainECCLock (NFCONT[7]) bit controls the generation of ECC parity code.
Note: In 8-bit ECC, MainECCLock should be cleared before InitMECC.
2. The 8-bit ECC module generates ECC parity code internally whenever data is written.
3. After 512-byte data (not include spare area data) is written, the parity codes are automatically updated to
NF8MECC0, NFMECC1, NF8MECC2, and NF8MECC3 registers. Use 512-byte NAND flash memory to
program these values to spare area. However, if more than 512-byte page NAND flash memory is used, s/w
can’t program immediately. In this case, you must copy these parity codes to other memory like DRAM. After
writing all main data, write the copied ECC values to spare area.
The parity codes have self-correctable information include parity code itself.
4. To generate spare area ECC parity code, set the MsgLength to 1(24-byte message length), and set the
ECCType to “01”(enable 8bit ECC). The ECC module generates ECC parity code for 24-byte write data.
Therefore reset ECC value by writing the InitMECC (NFCONT[5]) bit as ‘1’ after clearing the MainECCLock
(NFCONT[7]) bit to ‘0’(Unlock.
MainECCLock (NFCONT[7]) bit controls the generation of ECC parity code.
Note: In 8-bit ECC, MainECCLock should be cleared before InitMECC.
5. The 8-bit ECC module generates ECC parity code internally whenever data is written.
6. If you finish writing 24-byte meta or extra data, the parity codes are automatically updated to NF8MECC0,
NFMECC1, NF8MECC2, and NF8MECC3 registers. Program these parity codes to spare area.The parity
codes have self-correctable information including parity code itself.