Samsung S3C6400X User Manual page 177

NAND FLASH CONTROLLER
CONTROL REGISTER
Register Address
NFCONT 0x70200004
NFCONT
Reserved
ECC Direction
Lock-tight
Soft Lock
Reserved
EnbECCDecINT
Reserved
EnbIllegalAccINT
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
8-16
Specifications and information herein are subject to change without notice.
R/W
R/W NAND Flash control register
Bit
[31:19] Reserved
[18] 4-bit ECC encoding / decoding control
0: Decoding 4-bit ECC, It is used for page read
1: Encoding 4-bit ECC, It is used for page program
[17] Lock-tight configuration
0: Disable lock-tight
Once this bit is set to 1, you cannot clear. Only reset or
wake up from sleep mode can make this bit disable
(cannot cleared by software).
When it is set to 1, the area setting in NFSBLK
(0x70200020) to NFEBLK (0x70200024)-1 is unlocked,
and except this area, write or erase command will be
invalid and only read command is valid.
When you try to write or erase locked area, the illegal
access will be occurred (NFSTAT [5] bit will be set).
If the NFSBLK and NFEBLK are same, entire area will be
locked.
[16] Soft Lock configuration
0: Disable lock
Soft lock area can be modified at any time by software.
When it is set to 1, the area setting in NFSBLK
(0x70200020) to NFEBLK (0x70200024)-1 is unlocked,
and except this area, write or erase command will be
invalid and only read command is valid.
When you try to write or erase locked area, the illegal
access will be occurred (NFSTAT [5] bit will be set).
If the NFSBLK and NFEBLK are same, entire area will be
locked.
[15:13] Reserved. Should be written to 0.
[12] 4-bit ECC decoding completion interrupt control
0: Disable interrupt
[11] Reserved
[10] Illegal access interrupt control
0: Disable interrupt
Illegal access interrupt will occurs when CPU tries to
S3C6400X RISC MICROPROCESSOR
Description
Description
1: Enable lock-tight,
1: Enable lock
1: Enable interrupt
1: Enable interrupt
Reset Value
0x000100C6
Initial State
0
0
0
1
000
0
0
0