M36W108AB データシートの表示（PDF） - STMicroelectronics

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M36W108AB

8 Mbit (1Mb x8, Boot Block) Flash Memory and 1 Mbit (128Kb x8) SRAM Low Voltage Multi-Memory Product

STMicroelectronics 

M36W108AT, M36W108AB

SECURITY PROTECTION MEMORY AREA

The M36W108A 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

13.

Read Security Data (RDS) Instruction. This RDS

uses a single write cycle instruction: the command

B8h is written to the adrress 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.

Table 13. Security Block Instruction

Mne.

Instr.

Cyc.

Unlock Cycle

1st Cyc.

RDS

Read Security

Data

Addr. (1)

1

Data (2)

AAh

B8h

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.

2nd Cyc.

Read OTP Data until a new write cycle is

initiated

Figure 4. Security Block Address Table

TOP BOOT BLOCK

000FFh

00000h

Security

Memory Block

BOTTOM BOOT BLOCK

Security

Memory Block

0E0FFh

0E000h

AI02740

14/36

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