I couldn't find a clear specification about the period between two consecutive Command/Response Pair (T in the diagram).
for example, If I had sent a command to the card and received a response, What is the maximum period I can wait before the communication is not valid anymore? I need this because I'm willing to make use of this period to give me some flexibility in my design.
This is the block waiting time (which can be computed from the BWI part of TB3 in the ATR). If the card needs more time, it has to send a Waiting Time Extension (abbreviated WTX), before this elapses, which has to be acknowledged by the other side (typically the reader). If the acknowledge is not given both sides assume a communication error.
Note, that FWI and BWI from TA1 as well as the clock supplied to the card influence the time.
