Hi
We are planning to use TM4C129XNCZAD controller for one of our encryption engines.
The system should built in built in tamper detection and erase the secure info residing in the module
and this shall also have battery backup.
For this we were planning to form a conductive mesh securely around the system, the two
ends of the mesh would be connected to tamper pins of TM4C controller. From one pin controller
need to send a pattern and the would be expected on other pin.
Upon any physical intrusion, the sequence is not received on other pin, which would be treated as
tamper and invokes erase mechanism.
Havin said that, TM4C has 4 tamper pins, i need one tamper pin as input and the other as output.
Is it possible to use tamper pins as I/O or only input pins.
In our application we cannot rely on standard GPIO, as our tamper circuit has to run on a battery
when there is no primary supply.
Balaji
