Script PN533 P2P RF amplifier

hi everyone,

it was a while that I was not back on the forum.
I currently facing a problem to set up a P2P communication with two chips PN533.

I have developed two prototypes (two with a single antenna and two others with an amplifier).

I can communicate in P2P with the two first prototypes.

But with the second model that I designed, not as quick and smooth as it should be.

The first prototype is a simple PN533 with its antenna etc..
The second prototype is equipped with an RF amplifier.

I looked in the documentation and found this:

The PN533 has two transceiver pins TX1 & TX2. by using the amplifier solution, contactless reader transmission mode should be switched to asynchronous mode. This one is done by setting the register 0x14 (TXcontrolREG) to 0x83.

but i can't found the TXcontrolREG....

Does someone can help me put my antenna in the asynchronous mode.
I think the problems come from this transmission.
I can not find the exact commands to send to PN533 to put the antenna in asynchronous mode.

thank you in advance!

GGelec