MX25L1635D
Table 2. Protected Area Sizes
Status bit
Protect Level
16Mbit block grouping
(none)
BP3 BP2 BP1 BP0 NO.
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(1block, protected block 31th)
(2blocks, protected block 30th-31th)
(4blocks, protected block 28th-31th)
(8blocks, protected block 24th-31th)
(16blocks, protected block 16th-31th)
(32blocks, protected all)
2
3
4
5
6
(32blocks, protected all)
7
(32blocks, protected all)
8
(32blocks, protected all)
9
(16blocks, protected block 0th-15th)
(24blocks, protected block 0th-23th)
(28blocks, protected block 0th-27th)
(30blocks, protected block 0th-29th)
10
11
12
13
14
15
(31blocks, protected block 0th-30th)
(32blocks, protected all)
II. Additional 512-bit secured OTP for unique identifier: to provide 512-bit one-time program area for setting device
uniqueserialnumber-Whichmaybesetbyfactoryorsystemcustomer. Pleaserefertotable3. 512-bitsecuredOTP
definition.
- Security register bit 0 indicates whether the chip is locked by factory or not.
-Toprogramthe512-bitsecuredOTPbyentering512-bitsecuredOTPmode(withENSOcommand),andgoingthrough
normal program procedure, and then exiting 512-bit secured OTP mode by writing EXSO command.
-Customermaylock-downthecustomerlockablesecuredOTPbywritingWRSCUR(writesecurityregister)command
to set customer lock-down bit1 as "1". Please refer to table of "security register definition" for security register bit
definition and table of "512-bit secured OTP definition" for address range definition.
-Note:Oncelock-downwhateverbyfactoryorcustomer,itcannotbechangedanymore.Whilein512-bitsecuredOTP
mode, array access is not allowed.
Table 3. 512-bit Secured OTP Definition
Addressrange
xxxx00~xxxx0F
xxxx10~xxxx3F
Size
Standard
FactoryLock
CustomerLock
128-bit
384-bit
ESN (electrical serial number)
Determinedbycustomer
N/A
P/N:PM1374
REV. 1.5, OCT. 01, 2008
11
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