Part Number: MSP432P4111T
Our proposed architecture in our board is as given in the figure below. We are having 2 system controllers - one is primary and one is redundant. The primary controller is MSP432P4111T. What we are planning to do is as given below.
Incase Primary controller goes bad:
1. Keep primary controller in power-up state.
2. Hold the Reset pin of the primary controller such that it remains in reset always.
3. Then by default the I/O lines of primary controller will be in high impedance state. This will allow redundant controller to toggle the control lines.
Request you to give your inputs whether the above scheme is feasible for implementing redundancy. If there is a better way to do it kindly let us know. We want to avoid any other active devices (such as buffers) as that will again create a failure point.
