935267050025 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

935267050025

I•CODE1 Label IC (97pF) Chip Specification

Philips Electronics 

Product Specification

5.3 Memory Organisation

SL1 ICS31 01

Rev. 1.2

The 512 bit EEPROM memory is divided into 16 blocks. A block is the smallest access unit. Each

block consists of 4 bytes (1 block = 32 bits). Bit 0 in each byte represents the least significant bit

(LSB) and bit 7 the most significant bit (MSB), respectively.

Block 0

Block 1

Block 2

Block 3

Block 4

Block 5

Block 6

Block 7

Block 8

Block 9

Block 10

Block 11

Block 12

Block 13

Block 14

Block 15

Byte 0

SNR0

SNR4

F0

x

x

x

x

x

x

x

x

x

x

x

x

x

Byte 1

SNR1

SNR5

FF

x

x

x

x

x

x

x

x

x

x

x

x

x

Byte 2

SNR2

SNR6

FF

x

x

x

x

x

x

x

x

x

x

x

x

x

Byte 3

SNR3

SNR7

FF

x

x

x

x

x

x

x

x

x

x

x

x

x

Serial Number (lower bytes)

Serial Number (higher bytes)

Write Access Conditions

Special Functions (EAS/QUIET)

Family Code/Application Identifier/User Data

User Data

:

:

:

:

:

:

:

:

:

User Data

The values (in hexadecimal notation) shown in the table above are stored in the EEPROM after the

wafer production process. The content of blocks marked with ‘x’ in the table is not defined at

delivery.

5.3.1 Serial Number

The unique 64 bit serial number is stored in blocks 0 and 1 and is programmed during the

production process. SNR0 in the table represents the least significant byte and SNR7 the most

significant byte, respectively.

5.3.2 Write Access Conditions

The Write Access Condition bits in block 2 determine the write access conditions for each of the

16 blocks. These bits can be set only to 0 (and never be changed to 1), i.e. already write protected

blocks can never be written to from this moment on. This is also true for block 2. If this block is set

into write protected state by clearing of bits 4 and 5 at byte 0, no further changes in write access

conditions are possible.

Byte 0

âMSB

LSBâ

Block 2:

||||

Write Access 1|1 1|1 0|0 0|0

Conditions

||||

for Block à 3 2 1 0

Special Write Serial

Funct. Access Number

Byte 1

âMSB

LSBâ

||||

1|1 1|1 1|1 1|1

||||

7654

User

Data

.....

.....

.....

Byte 2

âMSB

LSBâ

||||

1|1 1|1 1|1 1|1

||||

11 10 9 8

..... ..... ..... .....

Byte 3

âMSB

LSBâ

||||

1|1 1|1 1|1 1|1

||||

15 14 13 12

.....

.....

.....

User

Data

The ones in the 16 pairs of bits have to be cleared together if the corresponding block is wanted to

be write protected forever (1|1 à write access enabled, 0|0 à write access disabled). Writing of bit

pairs 1|0 or 0|1 to block 2 is not allowed!

It is extremely important to be particularly careful when clearing the Write Access bits in

block 2, as you can lose write access to all of the blocks on the label in case of a mistake.

Of course you can use this feature to put the label into a hardware write protected state!

July 2000

Page 7 of 22

Public

Share Link: