Samsung S3F401F - Manual (Page 71)

S3F401F_UM_REV1.00 INTERNAL FLASH ROM
5-11
Table 5-4. Hardware Protection Area
FMDATA[15:0] Hardware Protection Area Sector Protected Area Address
0xFFFE Sector 000 ~ Sector 015 0x0000_0000 ~ 0x0000_3FFF
0xFFFD Sector 016~ Sector 031 0x0000_4000 ~ 0x0000_7FFF
0xFFFB Sector 032~ Sector 047 0x0000_8000 ~ 0x0000_BFFF
0xFFF7 Sector 048~ Sector 063 0x0000_C000 ~ 0x0000_FFFF
0xFFEF Sector 064~ Sector 079 0x0001_0000 ~ 0x0001_3FFF
0xFFDF Sector 080~ Sector 095 0x0001_4000 ~ 0x0001_7FFF
0xFFBF Sector 096~ Sector 111 0x0001_8000 ~ 0x0001_BFFF
0xFF7F Sector 112~ Sector 127 0x0001_C000 ~ 0x0001_FFFF
0xFEFF Sector 128~ Sector 143 0x0002_0000 ~ 0x0002_3FFF
0xFDFF Sector 144~ Sector 159 0x0002_4000 ~ 0x0002_7FFF
0xFBFF Sector 160~ Sector 175 0x0002_8000 ~ 0x0002_BFFF
0xF7FF Sector 176~ Sector 191 0x0002_C000 ~ 0x0002_FFFF
0xEFFF Sector 192~ Sector 207 0x0003_0000 ~ 0x0003_3FFF
0xDFFF Sector 208~ Sector 223 0x0003_4000 ~ 0x0003_7FFF
0xBFFF Sector 224~ Sector 239 0x0003_8000 ~ 0x0003_BFFF
0x7FFF Sector 240~ Sector 255 0x0003_C000 ~ 0x0003_FFFF
5.4 READ PROTECTION BIT 27
Most users want that their data and code in memory would not be read by others. Read Protection can give the
solution for it by preventing the flash data from being read serially in the tool program mode.
When this function is enabled, reading the flash data in the tool program mode will result in all zero read-out. You
should write the proper data (refer to the above Protection Bit table) into the address 0x00000E3C. The address
0x00000E3C should be written the register FMADDR. The data consisting of protection bit should be written the
register FMDATA. As a next step, you should write the values (0x5A5A5A5A) into key register (FMKEY). Finally, set
FMUCON. Please refer to figure3. (Option Sector Program Flowchart)