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M29W800AT Datasheet(PDF) 27 Page - STMicroelectronics |
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M29W800AT Datasheet(HTML) 27 Page - STMicroelectronics |
27 / 33 page ![]() 27/33 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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