st25r3911b VHBR ISO 14443A

[memo]

st25r3911b in 14443A mode

TX: BITRATE_848

RX: BITRATE_1695

tx is successful，when  receive , switch B mode  , but  fail  :CRC error ,soft framing error and hard framing error

how can I solve this problem or Which registers still need to be modified?

[Ulysses HERNIOSUS]

Hi,

ST25R3911B supports only VHBR for ISO14443B. Although modulation scheme of A VHBR and B VHBR are the same, however the frame format is different (A VHBR having parity bits and CRC_A, where as B VHBR having start and stop bits and CRC_B).

I think you will not be able to succeed this way. Only if you would dive into transparent mode and let MCU do everything.

BR, Ulysses

[memo]

I see,Thank you.

[Ulysses HERNIOSUS]

Hi,

to clarify this: VHBR is possible in B only. Tx in fc/8, fc/4, fc/2. Rx in fc/8 and fc/4. DS11793 rev7 is incorrect in this aspect.

BR, Ulysses