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M29W800AT Datasheet(PDF) 27 Page - STMicroelectronics

Part No. M29W800AT
Description  8 Mbit 1Mb x8 or 512Kb x16, Boot Block Low Voltage Single Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29W800AT Datasheet(HTML) 27 Page - STMicroelectronics

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M29W800AT, M29W800AB
Table 24. Security Block Instruction
Note: 1. Address bits A10-A19 are don’t care for coded address inputs.
2. Data bits DQ8-DQ15 are don’t care for coded address inputs.
Mne.
Instr.
Cyc.
Unlock Cycle
2nd Cyc.
1st Cyc.
RDS
Read
Security
Data
1
Addr. (1)
AAh
Read OTP Data until a new write cycle is initiated.
Data (2)
B8h
Figure 15. Security Block Address Table
Security
Memory Block
AI02746
TOP BOOT BLOCK
000FFh
Security
Memory Block
00000h
0E0FFh
0E000h
BOTTOM BOOT BLOCK
Security
Memory Block
TOP BOOT BLOCK
0007Fh
Security
Memory Block
00000h
0E01Fh
0E000h
BOTTOM BOOT BLOCK
BYTE Organisation (x8)
WORD Organisation (x16)
SECURITY PROTECTION MEMORY AREA
The M29W800A features a security protection
memory area. It consists of a memory block of 256
bytes or 128 words which is programmed in the ST
factory to store a unique code that uniquely identi-
fies the part.
This memory block can be read by using the Read
Security Data instruction (RDS) as shown in Table
24.
Read Security Data (RDS) Instruction. This RDS
uses a single write cycle instruction: the command
B8h is written to the address AAh. This sets the
memory to the Read Security mode. Any succes-
sive read attempt will output the addressed Secu-
rity byte until a new write cycle is initiated.


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