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M29W008AT датащи(PDF) 26 Page - STMicroelectronics |
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M29W008AT датащи(HTML) 26 Page - STMicroelectronics |
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26 / 30 page ![]() M29W008AT, M29W008AB 26/30 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 13. Security Block Address Table Security Memory Block AI02740 TOP BOOT BLOCK 000FFh Security Memory Block 00000h 0E0FFh 0E000h BOTTOM BOOT BLOCK SECURITY PROTECTION MEMORY AREA The M29W008A features a security protection memory area. It consists of a memory block of 256 bytes which is programmed in the ST factory to store a unique code that uniquely identifies 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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