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Mifare Classic with CR95HF

Question asked by clapson.jonathan.001 on Apr 2, 2015
Latest reply on Sep 29, 2017 by Richard Lowe
I am trying to use the CR95HF to read mifare classic tags. I am trying to send the authentication with key a command. I have been monitoring the communications between the CR95HF and the card using a proxmark. 

I am certain I am sending the authentication command correctly as I can see the response Token RB. However the CR95HF is returning a timeout (ie it seems as if there is a short time out running and it is timing out before the response is received).

I notice on page 19 of the CR95HF datasheet it says "Note that REQA, WUPA,Select20 and Select70commands use a fixed intervalof 86/90 μs between a requestand its reply. Other commandsuse a variable interval withfixed granularity." I'm wondering if I need to adjust the frame wait time? If so are there any recommendations for what I set the PP and MM bits to? Otherwise does anyone have any ideas as to what I might be doing wrong?