Datasheet

MF1S50YYX All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.0 — 2 May 2011
196330 8 of 39
NXP Semiconductors
MF1S50yyX
MIFARE Classic 1K - Mainstream contactless smart card IC
8.5 RF interface
The RF-interface is according to the standard for contactless smart cards
ISO/IEC 14443A.
For operation, the carrier field from the reader always needs to be present (with short
pauses when transmitting), as 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).
8.6 Memory organization
The 1024 × 8 bit EEPROM memory is organized in 16 sectors of 4 blocks. One block
contains 16 bytes.
Fig 5. Memory organization
001aan011
Byte Number within a Block
15141312111098765
Key A Access Bits Key B
43210Block
3
Sector
15
2
1
0
Description
Sector Trailer 15
Data
Data
Data
Sector Trailer 14
Data
Data
Data
Sector Trailer 0
Data
Data
Manufacturer Block
Sector Trailer 1
Data
Data
Data
314
2
1
0
31
2
1
0
30
2
1
0
:
:
:
:
:
:
Key A Access Bits Key B
Key A Access Bits Key B
Key A Access Bits
Manufacturer Data
Key B