ST72682 STMicroelectronics, ST72682 Datasheet - Page 13

• Manufacturer Part Number: ST72682
• Description: USB 2.0 high-speed Flash drive controller
• Manufacturer: STMicroelectronics

ST72682
Table 7.
4.1
4.1.1
4.1.2
NAND Flash part number
Hynix HY27UH088G2M
Hynix HY27UU088G5M
Hynix HY27UT084G2M
Micron 29F2G08AA
Micron 29F4G08BA
Micron 29F8G08FA
Known NAND Flash memory compatibility guide for ST72682/R20 and ST72682/R21
NAND Flash error correction
No NAND Flash memory arrays are guaranteed by manufacturers to be error-free. Error
occurrence depends on the Flash cell type (MLC or SLC).
The ST72682 embeds hardware and firmware mechanisms to correct the errors.
Hardware error correction
The ST72682 embeds a Reed-Solomon algorithm-based hardware cell. This cell directly
manages 512-byte data packets on the NAND I/O system.
Based on the data packet content, the cell generates an 80-bit Error Correction Code (ECC)
consisting of 8 words, each containing 10 bits.
During write operations to NAND memory, the 512-bytes of data and the ECC are stored
together in the same page. The ECC is stored in the corresponding Redundant Area (RA),
using 10 bytes.
During read operations, the 512-bytes of data and the 8 ECC words are read back and are
passed through the Reed-Solomon cell for decoding. The cell allows the correction of 4
symbols in this 520-symbol packet (512 symbols from data + 8 symbols from ECC).
The hardware cell gives three possible results:
Firmware error management
The firmware defines the error correction possibilities with the corrected data packet.
When data cannot be repaired, the block is considered as a bad block and is replaced by
another one. See
No error detected: the data packet can be used as it is.
Correctable error detected: the corrected data are available in a specific 512-byte buffer
in the Reed-Solomon cell and are ready to be used.
Uncorrectable error detected: data corruption cannot be repaired.
NAND Flash size (Mbytes or
512 MB; MLC2K; Single CE
256 MB; SLC2K; Single CE
512 MB; SLC2K; Single CE
1 GB; SLC2K; Single CE
1 GB; MLC2K; Dual CE
1 GB; SLC2K; Dual CE
Section 4.2
Gbytes) and type
for further information on bad block management.
ST72682/R20 device
Number of NAND Flash devices supported
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
2 or 4
2 or 4
NAND Flash memory interface
ST72682/R21 device
www.DataSheet4U.com
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
1, 2, 4, 6 or 8
1, 2 or 4
1, 2 or 4
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