EM4069B5WW11 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

부품명

상세내역

일치하는 목록

EM4069B5WW11

128 bit Read/Write Contactless Identification Device with OTP function

EM Microelectronic - MARIN SA 

Command 5 : Read configuration word

Read configuration word command is an auxiliary

command used to read configuration word. This mode will

be active until power down or reset command.

The 8-bit CRC with polynomial u8 + u4 + u3 + u2 + u0 is

used in commands 3 and 4. The CRC is calculated

including the Command-Byte.

CRC Calculation

U2

U3

U4

U8

76 + 5 + 4 + 321 0 +

MSB

LSB

+ Exclusive OR

Register Stage

Data

Fig. 9

The following table shows the CRC according to some test

bytes:

Byte

[hex]

01

80

Resulting CRC

[hex]

1D

26

In test above it is supposed that the leftmost bit is the MSB

and is transmitted first.

Within 1ms after EEPROM update completion, a further

command will be accepted by the EM4069 without a new

synchronization pattern.

After time-out of this period, the EM4069 will return to read

out mode.

EM4069

EM4169

Write 16 bit EEPROM Word Command

As described in the Command Table an 8-bit pattern has to

be sent to execute commands rst, rROM and rcw. Bit

pattern of Write Word command is different since word

address, 16 bits of data and 8 bit CRC have to be

transmitted. The Write command bit pattern is the

following:

1100 [4 bit word address] [16 bit data] [8 bit CRC]

Word address:

One of eight EEPROM words is selected. Valid addresses

are in range from 0 (0000) to 7 (0111)

Data bits:

During read out bit which is first sent in is first read out

(FIFO)

CRC:

Calculated over whole command stream

Example of Write Word command:

C5 D2 2D 20 (hex)

The above command (1100 0101) write to

• Word 5

• hexadecimal data “D2 2D”

• CRC bits are hex 20.

in Sync. wr

out Read

Read

tWee

1ms

Fig. 10

Write Configuration word Command

Configuration word is a special word which is used to lock

(protect from writing) EEPROM words. The bits of

configuration word are OTP (once programmed at 1 they

can not be reprogrammed to 0).

Special care has to be taken when adding lock bits to

the protection word that already has some bits set to

one. The bits that are already set to one have to be

confirmed at a new command in order to allow writing

of additional bits. If not, bits that are already locked

stay locked, and the new selected bits might not be

programmed.

Copyright  2003, EM Microelectronic-Marin SA

8

www.emmicroelectronic.com

Share Link: