M36W108AB datasheet(14/36 Pages) STMICROELECTRONICS

Part #	M36W108AB

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

PDF	36 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 36 page

M36W108AT, M36W108AB

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Figure 4. 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 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

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

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