Chapter 10 Memory Subsystem.pdf

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– 1 nibble padding spare, processing OFF
– size1 nibbles spare, processing ON
Checksum: Spare area size (nibbles) = size0 + (S - (1+size1))
10.1.5.14.3.2.2.13 Mode 0x5
Page processing sequence:
• Repeat with buffer 0 to S-1
– 512-byte data, processing ON
• Repeat with buffer 0 to S-1
– size0 nibbles spare, processing ON
• Repeat with buffer 0 to S-1
– size1 nibbles spare, processing ON
Checksum: Spare area size (nibbles) = S - (size0 + size1)
10.1.5.14.3.2.2.14 Mode 0xB (11)
Page processing sequence:
• Repeat with buffer 0 to S-1
– 512-byte data, processing ON
• Repeat with buffer 0 to S-1
– size0 nibbles spare, processing ON
• Repeat with buffer 0 to S-1
– 1 nibble padding spare, processing OFF
– size1 nibbles spare, processing ON
Checksum: Spare area size (nibbles) = S - (size0 + 1 + size1)
10.1.5.14.3.2.2.15 Mode 0x6
Page processing sequence:
• Repeat with buffer 0 to S-1
– 512-byte data, processing ON
• Repeat with buffer 0 to S-1
– size0 nibbles spare, processing ON
• Repeat S times (no buffer used)
– size1 nibbles spare, processing OFF
Checksum: Spare area size (nibbles) = S - (size0 + size1)
10.1.5.14.3.2.3 Supported NAND Page Mappings and ECC Schemes
The following rules apply throughout the entire mapping description:
• Main data area (sectors) size is hardcoded to 512 bytes.
• Spare area size is programmable.
• All page sections (of main area data bytes, protected spare bytes, unprotected spare bytes, and ECC)
are defined as explained in Section 10.1.5.14.3.2.2.1.
Each one of the following sections shows a NAND page mapping example (per-sector spare mappings,
pooled spare mapping, per-sector spare mapping, with ECC separated at the end of the page).
In the mapping diagrams, sections that belong to the same BCH codeword have the same color (blue or
green); unprotected sections are not covered (orange) by the BCH scheme.
SPRUGN4L–May 2010–Revised June 2011 Memory Subsystem
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