MX25L12835F
I. Block lock protection
- The Software Protected Mode (SPM) use (BP3, BP2, BP1, BP0 and T/B) bits to allow part of memory to be
protected as read only. The protected area definition is shown as "Table 2. Protected Area Sizes", the protected
areas are more flexible which may protect various area by setting value of BP0-BP3 bits.
- The Hardware Proteced Mode (HPM) use WP#/SIO2 to protect the (BP3, BP2, BP1, BP0) bits and Status Reg-
ister Write Protect bit.
- In four I/O and QPI mode, the feature of HPM will be disabled.
Table 2. Protected Area Sizes
Protected Area Sizes (T/B bit = 0)
Status bit
Protect Level
128Mb
BP3
0
BP2
BP1
0
BP0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0 (none)
0
0
1
1 (1 block, protected block 255th)
2 (2 blocks, block 254th-255th)
3 (4 blocks, block 252nd-255th)
4 (8 blocks, block 248th-255th)
5 (16 blocks, block 240th-255th)
6 (32 blocks, block 224th-255th)
7 (64 blocks, block 192nd-255th)
8 (128 blocks, block 128th-255th)
9 (256 blocks, protected all)
0
1
0
0
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
10 (256 blocks, protected all)
11 (256 blocks, protected all)
12 (256 blocks, protected all)
13 (256 blocks, protected all)
14 (256 blocks, protected all)
15 (256 blocks, protected all)
1
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Protected Area Sizes (T/B bit = 1)
Status bit
Protect Level
128Mb
BP3
0
BP2
0
BP1
0
BP0
0
0 (none)
0
0
0
1
1 (1 block, protected block 0th)
0
0
1
0
2 (2 blocks, protected block 0th~1th)
3 (4 blocks, protected block 0th~3rd)
4 (8 blocks, protected block 0th~7th)
5 (16 blocks, protected block 0th~15th)
6 (32 blocks, protected block 0th~31st)
7 (64 blocks, protected block 0th~63rd)
8 (128 blocks, protected block 0th~127th)
9 (256 blocks, protected all)
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
10 (256 blocks, protected all)
1
0
1
1
11 (256 blocks, protected all)
1
1
0
0
12 (256 blocks, protected all)
1
1
0
1
13 (256 blocks, protected all)
1
1
1
0
14 (256 blocks, protected all)
1
1
1
1
15 (256 blocks, protected all)
P/N: PM1795
REV. 1.0, OCT. 23, 2012
10
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