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TRF7970A Operation in ISO14443A emulation

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Hi All,

In the manual (page 29, rev. G) it says that it is possible to start the transmission right after writing the first byte into the FIFO (quote "Send the transmit command and the number of bytes to be transmitted first, and then start to send the data to the FIFO. The transmission starts when first data byte is written into the FIFO").

I'm writing the sequence SS_DOWN [8F 90 3D 00 50 88 05 04 03 00] SS_UP but the transmission does not start after writing the first byte. The sequence is:

SSelect_low
Command: FIFO Reset;
Command: TRANSMIT_NO_CRC;
Command: Continuous write to register TX_LENGTH_BYTE_1
Data: Count (MSB)
Data: Count (LSB)
Data [5 bytes]
SSelect_high

Is there anything wrong in the sequence? How should I do it for the transmission to start right after writing the first data to the FIFO?

(Attached bellow there is on DSO capture)

Victor


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