M29W800AT datasheet(27/33 Pages) 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

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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