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UM0851 Datasheet(PDF) 129 Page - STMicroelectronics

Part # UM0851
Description  SPEAr is a family of highly customizable ARM-based embedded
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0851 Datasheet(HTML) 129 Page - STMicroelectronics

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UM0851
Non-volatile memory device drivers
Doc ID 16604 Rev 2
129/245
.oobfree = {{8, 8}, {24, 8}, {40, 8}, {56, 8}}
};
Figure 33.
OOB layout for various size NAND Flash
Bad block table (BBT)
NAND memory sometimes gets shipped with blocks that are already bad. The vendor just
marks those blocks as bad, thus resulting in higher yield and lower per-unit cost.
2
3
0
1
5
6
7
4
X
X
ECC
B
X
X
A
B
8
9
D
E
F
C
X
X
X
X
X
X
X
X
0
2
3
0
1
5
6
7
4
B
X
ECC
X
X
X
A
B
8
9
D
E
F
C
X
X
X
X
X
X
X
X
X
X
ECC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
ECC
X
X
X
X
X
ECC
X
X
X
0x00
0x10
0x20
0x30
0
16 byte OOB for x8 NAND Flash
if (OOB[5] != 0xFF) blo ck is NOT valid
512 bytes page
511
5 28
10 39
1056
2
3
0
1
5
6
7
4
B
B
ECC
X
X
X
A
B
8
9
D
E
F
C
X
X
X
X
X
X
X
X
2048 bytes page
2047
4224
21 12
4159
64 byte OOB
16 byte OOB for x16 NAND Flash
if (OOB [0] != 0xFFFF) block is NOT valid
16 b yte OOB
64 byte OOB for x8 NAND Fla sh
if (OOB [0] != 0xFF) block is NOT valid
64 byte OOB for x16 NAND Flash
if (OOB[0] != 0xFFFF) block is NOT valid
2
3
0
1
5
6
7
4
B
B
ECC
X
X
X
A
B
8
9
D
E
F
C
X
X
X
X
X
X
X
X
X
X
ECC
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
ECC
X
X
X
X
X
ECC
X
X
X
0x00
0x10
0x20
0x30
Sm all Page NA ND Flash
Lar ge Page NA ND Flash



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