MB89R119B datasheet(3/46 Pages) RAMXEED

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MB89R119B

DS411-00002-4v0-E



MEMORY MAP

This section describes the FeRAM memory, which is the internal memory of the MB89R119B.



FeRAM Configuration

The FeRAM has 232 bytes for use as user area and 24 bytes for use as system area.

The FeRAM memory areas consist of a total of 64 blocks (58 blocks of user area and 6 blocks of system

area). Each block can store 32 bits (4 bytes) of data.

The block is the unit used for the writing and reading of FeRAM data. The memory configuration of the

FeRAM is shown below.



FeRAM memory configuration

* : Reserved for future use

Blocks “00H” to “39H” are user area. The user area is defined as an accessible area when the corresponding

block address is specified. On the other hands, Blocks “3AH” to “3FH” are system area. The system area is

defined as an accessible area only with a specific command.

The system area consists of 6 blocks and contains RFU, UID, AFI, DSFID, EAS, IC reference and security

status (can write or cannot write data). UID, IC reference and RFU are fixed and cannot be updated. The

initial data of AFI, DSFID, and EAS are written at the factory, and they can be updated and locked (disable

to write) with commands (EAS bit cannot be locked) .

As shown in above, “3BH” and “3CH” are used to store the UID data, and “3EH” and “3FH” are used to store

the security status information such as user areas, AFI, and DSFID.

“3DH” to “3FH” block format is shown as follows. “3DH” block contains EAS bit, AFI, DSFID and IC reference.

“3EH” and “3FH” blocks contain block security status data.

Area

Block No.

Details

Data read

Data write

User area (232 bytes)

00H to 39H

User area

Yes

System area (24 bytes)

3AH

RFU*

Yes

3BH

UID1 (1 to 32 bit)

Yes

3CH

UID2 (33 to 64 bit)

Yes

3DH

EAS, AFI, DSFID,

IC Reference

Yes

Limited

3EH,3FH

Block security status

Yes



“3DH” block format

MSB

LSB

25 24

17 16

9 8

EAS Bit

Internally used

IC Reference

DSFID

AFI

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