MB89R118C datasheet(3/47 Pages) RAMXEED

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MB89R118C

DS411-00001-6v0-E



MEMORY MAP

This section describes the FeRAM memory, which is the internal memory of the MB89R118C.



FeRAM Configuration

The FeRAM has 2000 bytes for use as user area and 48 bytes for use as system area.

The FeRAM memory areas consist of a total of 256 blocks (250 blocks of user area and 6 blocks of system

area). Each block can store 64 bits (8 bytes) of data.

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

is shown below.



FeRAM memory configuration

Blocks “00H” to “F9H” are user area. The user area is defined as an area that can be accessed when the

corresponding block address is specified. On the other hand, Blocks “FAH” to “FFH” are system area. The

system area is defined as an area that can be accessed only with a specific command.

The system area consists of 6 blocks and contains UID, AFI, DSFID, EAS bits, and security status (can write

or cannot write) data for individual block. UID is fixed and cannot be updated. AFI, DSFID, and EAS bits are

written at the factory, and can be updated and locked (disable to write) with commands (Only EAS bit cannot

be locked) .

As shown in above, “FAH” holds the UID, and “FCH” to “FFH” hold the security status information on individual

user areas.

The configuration of “FBH” to “FFH” blocks is shown below. “FBH” block is used for EAS status, AFI and DSFID

data, the security status data of AFI and DSFID. “FCH” to “FFH” blocks contain block security status data.

* : Reserved for future use

Area

Block No.

Details

Data read

Data write

User area (2000 bytes)

00H to F9H

User area

Yes

System area (48 bytes)

FAH

UID (64 bits)

Yes

FBH

AFI, DSFID, EAS,

security status

Yes

Limited

FCH to FFH

Block security status

Yes

MSB

RFU*

DSFID

LSB

AFI

Lock

DSFID

Lock

EAS

Status



Structure of “FBH”

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