NXP Semiconductors
MF1S50YYX_V1
MIFARE Classic EV1 1K - Mainstream contactless smart card IC for fast and easy solution development
MF1S50yyX_V1 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2018. All rights reserved.
Product data sheet Rev. 3.2 — 23 May 2018
COMPANY PUBLIC 279232 9 / 36
001aam204
1514131211109876543
UID Manufacturer Data
Block 0/Sector 0
21Byte 0
Figure 7. Manufacturer block for MF1S500yX with 7-byte UID
8.6.2 Data blocks
All sectors contain 3 blocks of 16 bytes for storing data (Sector 0 contains only two data
blocks and the read-only manufacturer block).
The data blocks can be configured by the access bits as
• read/write blocks
• value blocks
Value blocks can be used for e.g. electronic purse applications, where additional
commands like increment and decrement for direct control of the stored value are
provided
A successful authentication has to be performed to allow any memory operation.
Remark: The default content of the data blocks at delivery is not defined.
8.6.2.1 Value blocks
Value blocks allow performing electronic purse functions (valid commands are: read,
write, increment, decrement, restore, transfer). Value blocks have a fixed data format
which permits error detection and correction and a backup management.
A value block can only be generated through a write operation in value block format:
• Value: Signifies a signed 4-byte value. The lowest significant byte of a value is stored
in the lowest address byte. Negative values are stored in standard 2´s complement
format. For reasons of data integrity and security, a value is stored three times, twice
non-inverted and once inverted.
• Adr: Signifies a 1-byte address, which can be used to save the storage address of a
block, when implementing a powerful backup management. The address byte is stored
four times, twice inverted and non-inverted. During increment, decrement, restore and
transfer operations the address remains unchanged. It can only be altered via a write
command.
001aan018
151413121110987654321Byte Number 0
adradradradrvalue valuevalueDescription
Figure 8. Value blocks
An example of a valid value block format for the decimal value 1234567d and the block
address 17d is shown in Table 4. First, the decimal value has to be converted to the
hexadecimal representation of 0012D687h. The LSByte of the hexadecimal value is
stored in Byte 0, the MSByte in Byte 3. The bit inverted hexadecimal representation of
the value is FFED2978h where the LSByte is stored in Byte 4 and the MSByte in Byte 7.
The hexadecimal value of the address in the example is 11h, the bit inverted
hexadecimal value is EEh.
