Preliminary
S3C2451X RISC MICROPROCESSOR
NAND FLASH CONTROLLER
7
-13
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
7.13.2 NAND FLASH CONFIGURATION REGISTER
Register
Address
R/W
Description
Reset Value
NFCONF
0x4E000000
R/W
NAND Flash Configuration register
0xX000100X
NFCONF
Bit
Description
Initial State
Reserved [31]
Reserved
0
Reserved [30]
Should be 0
0
Reserved [29:26]
Reserved
0000
MsgLength [25]
Message (Data) length for 4/8 bit ECC
0: 512-byte 1: 24-byte
0
ECCType [24:23]
This bit indicates what kind of ECC should be used.
00: 1-bit ECC
10: 4-bit ECC
01 : 8-bit ECC
Note. Don’t confuse the value of 4-bit ECC and 8-bit
ECC.
H/W Set
(CfgBootEcc)
Reserved [22:15]
Reserved
000000000
TACLS [14:12]
CLE & ALE duration setting value (0~7)
Duration = HCLK x TACLS
001
Reserved [11]
Reserved
0
TWRPH0 [10:8]
TWRPH0 duration setting value (0~7)
Duration = HCLK x ( 1 )
000
Reserved [7]
Reserved
0
TWRPH1 [6:4]
TWRPH1 duration setting value (0~7)
Duration = HCLK x ( 1 )
000
PageSize [3]
This bit indicates the page size of NAND Flash Memory
When PageSize_Ext is 1, the value of PageSize means
following:
0: 512 Bytes/page,
1: 2048 Bytes/page
When PageSize_Ext is 0, the value of PageSize means
following:
0: 2048 Bytes/page,
1: 4096 Bytes/page
H/W Set
(CfgAdvFlash)
PageSize_Ext
[2]
This bit indicated what kind of NAND Flash memory is used.
0: Large Size NAND Flash
1: Small Size NAND Flash
This bit is determined by OM[2] pin status on reset and
wake-up time from sleep mode.
1