Product data

MFRC631 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 4 February 2014
227433 13 of 120
NXP Semiconductors
MFRC631
High performance ISO/IEC 14443 A/B reader solution
8.3.2 ISO/IEC14443B functionality
The physical level of the communication is shown in Figure 7.
The physical parameters are described in Table 6.
The MFRC631 connected to a host is required to manage the complete ISO/IEC 14443 B
protocol. The following Figure 8 “
SOF and EOF according to ISO/IEC 14443 B” shows the
ISO/IEC 14443B SOF and EOF.
(1) Reader to Card NRZ, Miller coded, transfer speed 106 kbit/s to 848 kbit/s
(2) Card to reader, Subcarrier Load Modulation Manchester Coded or BPSK, transfer speed 106 kbit/s
to 848 kbit/s
Fig 7. ISO/IEC 14443 A/MIFARE read/write mode communication diagram
(1)
(2)
001aal997
ISO/IEC 14443 B CARD
ISO/IEC 14443 B
READER
Table 6. Communication overview for ISO/IEC 14443 B reader/writer
Communication
direction
Signal type Transfer speed
106 kbit/s 212 kbit/s 424 kbit/s 848 kbit/s
Reader to card (send
data from the
MFRC631 to a card)
fc = 13.56 MHz
reader side
modulation
10 % ASK 10 % ASK 10 % ASK 10 % ASK
bit encoding NRZ NRZ NRZ NRZ
bit rate [kbit/s] 128 / fc 64 / fc 32 / fc 16 / fc
Card to reader
(MFRC631 receives
data from a card)
card side
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier load
modulation
subcarrier
frequency
fc/16 fc/16 fc /16 fc /16
bit encoding BPSK BPSK BPSK BPSK
Fig 8. SOF and EOF according to ISO/IEC 14443 B
001aam270
UNMODULATED (SUB)
CARRIER
Start of Frame (SOF)
sequence
9.44 µs
''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''1'' ''1'' DATA
LAST CHARACTER
UNMODULATED (SUB)
CARRIER
End of Frame (EOF)
sequence
9.44 µs
''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0'' ''0''