MD2202-D32-X-P SanDisk, MD2202-D32-X-P Datasheet - Page 10

• Manufacturer Part Number: MD2202-D32-X-P
• Manufacturer: SanDisk

Specifications of MD2202-D32-X-P

• Lead Free Status / RoHS Status: Compliant

3.3
The boot block is responsible for answering the BIOS expansion search in PC architectures. After
the BIOS identifies DiskOnChip 2000 as a valid BIOS expansion device, it executes the code stored
in the boot block. The BIOS then loads the TrueFFS software from the flash memory into the host
memory, delivering full disk capabilities to the operating system. This code is identical for all
DiskOnChip 2000 capacities, since TrueFFS automatically detects the memory density of
DiskOnChip 2000.
3.4
NAND flash, being an imperfect memory, requires error handling. DiskOnChip 2000 implements
Reed-Solomon Error Detection Code (EDC). A hardware-generated, 6-byte error detection
signature is computed each time a page (512 bytes) is written to or read from DiskOnChip 2000.
The TrueFFS driver implements complementary Error Correction Code (ECC). Unlike error
detection, which is required on every cycle, error correction is relatively seldom required, hence
implemented in software. The combination of DiskOnChip’s built-in EDC mechanism and the
TrueFFS driver ensures highly reliable error detection and correction, while providing maximum
performance.
The following detection and correction capability is provided for each 512 bytes:
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3.5
The Flash Control block contains registers responsible for transferring the address, data and control
information between the DiskOnChip TrueFFS driver and the flash media. Additional registers are
used to monitor the status of the flash media (ready/busy) and of the DiskOnChip controller.
10
Corrects up to two 10-bit symbols, including two random bit errors.
Corrects single bursts up to 11 bits.
Detects single bursts up to 31 bits and double bursts up to 11 bits.
Detects up to 4 random bit errors.
Boot Block
Error Detection Code/Error Correction Code (EDC/ECC)
Flash Control
Data Sheet, Rev. 3.9
DiskOnChip 2000 DIP
91-SR-002-42-8L