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Device Initialization by ROM Code
Table 26-32. Supported NAND Devices (continued)
Capacity
Device ID
Bus Width
Page Size in KB
2Gb
71h
8
512
2Gb
51h
16
512
2Gb
31h
8
512
2Gb
41h
16
512
4Gb
ACh
8
2048
4Gb
DCh
8
2048
4Gb
BCh
16
2048
4Gb
CCh
16
2048
8Gb
A3h
8
2048
8Gb
D3h
8
2048
8Gb
B3h
16
2048
8Gb
C3h
16
2048
16Gb
A5h
8
2048
16Gb
D5h
8
2048
16Gb
B5h
16
2048
16Gb
C5h
16
2048
32Gb
A7h
8
2048
32Gb
B7h
16
2048
64Gb
AEh
8
2048
64Gb
BEh
16
2048
After retrieving parameters from the table, page size and block size are updated based on the fourth
byte of the NAND ID data. Because of inconsistency among manufacturers, only NAND devices
recognized to be at least 2Gb have these parameters updated. Therefore, the ROM code supports
4-KB page NAND devices, but only if their size, according to the table, is at least 2Gb. NAND devices
smaller than 2Gb have the block size parameter set to 32KB when the page size is 512KB and to
128KB when the page size is 2048KB.
shows the fourth ID data byte encoding used in the
ROM code.
Table 26-33. Fourth NAND ID Data Byte
I/O Number
Item
Description
7
6
5
4
3
2
1
0
1KB
0
0
2KB
0
1
Page Size
4KB
1
0
8KB
1
1
64KB
0
0
128KB
0
1
Block Size
256KB
1
0
512KB
1
1
3547
SWPU177N – December 2009 – Revised November 2010
Initialization
Copyright © 2009–2010, Texas Instruments Incorporated