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Device Initialization by ROM Code
Table 26-34. ID2 Byte Description
Byte Number
Name
Value
Unit
Notes
1
Page size
2X
Bytes
00H = 1B
09H = 512B
0BH = 2KB
2
Block size
2X
Bytes
00H = 1B
0EH = 16KB
11H = 128KB
3
Block count
2X
Pcs
00H = 1 pc
0BH = 2048 pcs
0CH = 4096 pcs
4
Spare size
2X
Bytes
00H = 1B
04H = 16B
06H = 64B
5
Column address
X
Pcs
Higher nibble
1H = 1 column address sequence
2H = 2 column address sequence
Row address
X
Pcs
Lower nibble
1H = 1 row address sequence
2H = 2 row address sequence
6
ECC type
X
Bit ECC
Higher nibble
0H = No ECC needed
1H = 1-bit ECC
4H = 4-bit ECC
Bus width
2x
Width
Lower nibble
3H = 8-bit NAND interface
4H = 16-bit NAND interface
7
Number of CEs
X
Pcs
Higher nibble
1H = 1x CE#
2H = 2x CE#
Cell type
X
Bit/cell
Lower nibble
1H = 1 bit per cell
2H = 2 bits per cell
8
Boot block
X
kB
0H = No boot block
1H = 1KB boot block
2H = 2KB boot block
9
Multiple page prg
X
Pcs
Higher nibble
1H = 1 plane
4H = 4 planes
For future use
10
Partial prg count
X
Per page
1H = No partial prg allowed
2H = 2 per page
11
Read time maximum
12
Prg time maximum
13
Erase time maximum
252nd
Identification number
X
B2184D7Bh
255th
256th
Register/spec
XvX
Higher nibble: Major digit
version
Lower nibble: Decimal digit
Registers according to spec: 2v0:
20h
•
Bad block detection/verification
Invalid blocks contain invalid bits whose reliability cannot be ensured by the manufacturer. These bits
are identified in the factory or during the programming and reported in the initial invalid block
information in the spare area on the first and second page of each block. Because the ROM code
looks for an image in the first four blocks, it detects the validity status of these blocks. Blocks detected
as invalid are not accessed later. Block validity status is coded in the spare areas of the first two pages
of a block.
lists the validity status coding for the four NAND families.
3551
SWPU177N – December 2009 – Revised November 2010
Initialization
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