NAND04GW3B2AN1E STMICROELECTRONICS [STMicroelectronics], NAND04GW3B2AN1E Datasheet - Page 36

• Manufacturer Part Number: NAND04GW3B2AN1E
• Description: 4 Gbit, 8 Gbit, 2112 Byte/1056 Word Page 3V, NAND Flash Memories
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Software algorithms
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Software algorithms
This section gives information on the software algorithms that ST recommends to implement
to manage the Bad Blocks and extend the lifetime of the NAND device.
NAND Flash memories are programmed and erased by Fowler-Nordheim tunnelling using a
high voltage. Exposing the device to a high voltage for extended periods can cause the
oxide layer to be damaged. For this reason, the number of program and erase cycles is
limited (see
value) and it is recommended to implement Garbage Collection, a Wear-Leveling Algorithm
and an Error Correction Code, to extend the number of program and erase cycles and
increase the data retention.
To help integrate a NAND memory into an application ST Microelectronics can provide a File
System OS Native reference software, which supports the basic commands of file
management.
Contact the nearest ST Microelectronics sales office for more details.
Bad Block Management
Devices with Bad Blocks have the same quality level and the same AC and DC
characteristics as devices where all the blocks are valid. A Bad Block does not affect the
performance of valid blocks because it is isolated from the bit line and common source line
by a select transistor.
The devices are supplied with all the locations inside valid blocks erased (FFh). The Bad
Block Information is written prior to shipping. Any block, where the 1st and 6th Bytes, or 1st
Word, in the spare area of the 1st page, does not contain FFh, is a Bad Block.
The Bad Block Information must be read before any erase is attempted as the Bad Block
Information may be erased. For the system to be able to recognize the Bad Blocks based on
the original information it is recommended to create a Bad Block table following the
flowchart shown in
Block Replacement
Over the lifetime of the device additional Bad Blocks may develop. In this case the block has
to be replaced by copying the data to a valid block. These additional Bad Blocks can be
identified as attempts to program or erase them will give errors in the Status Register.
As the failure of a page program operation does not affect the data in other pages in the
same block, the block can be replaced by re-programming the current data and copying the
rest of the replaced block to an available valid block. The Copy Back Program command can
be used to copy the data to a valid block.
See
Refer to
during an operation.
Section 6.4: Copy Back Program
Table 14: Block Failure
Table 15: Program, Erase Times and Program Erase Endurance Cycles
Figure 17: Bad Block Management
for the recommended procedure to follow if an error occurs
for more details.
NAND04GW3B2B, NAND08GW3B2A
Flowchart.
for