MF1ICS70_043544

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Product data sheet

PUBLIC

Rev. 4.4 — 25 November 2010

043544

7 of 20

NXP Semiconductors

MF1ICS70

Functional specification

6.5 RF interface

The RF-interface is according to the standard for contactless smart cards

ISO/IEC 14443 A.

The carrier field from the reader is always present (with short pauses when transmitting),

because it is used for the power supply of the card.

For both directions of data communication there is only one start bit at the beginning of

each frame. Each byte is transmitted with a parity bit (odd parity) at the end. The LSB of

the byte with the lowest address of the selected block is transmitted first. The maximum

frame length is 163 bits (16 data bytes + 2 CRC bytes = 16 * 9 + 2 * 9 + 1 start bit).

6.6 Memory organization

The 4 kByte EEPROM memory is organised in 32 sectors with 4 blocks and in 8 sectors

with 16 blocks. One block consists of 16 bytes. In the erased state the EEPROM cells are

read as a logical “0”, in the written state as a logical “1”.

Fig 4.

Memory organization

Sec to r

Blo c k

0

1

234

5

678

9 1 0 1 1 12 1 3 1 4 1 5

Des crip tio n

39

1 5

Sec to r T ra iler 39

14

Data

13

Data

..

..

..

..

2

Data

1

Data

0

Data

..

..

..

..

..

..

32

1 5

Sec to r T ra iler 32

14

Data

13

Data

..

..

..

..

2

Data

1

Data

0

Data

31

3

Sec to r T ra iler 31

2

Data

1

Data

0

Data

..

..

..

..

..

..

03

Sec to r T ra iler 0

2

Data

1

Data

0

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