TM4C1294NCPDT: using 1GHz clock input with tm4c1294ncpdt timers

Tool/software:

Hello,

I’m working on a high-precision digital power supply application (20 V, 50 A output) and aiming for control resolution on the order of 10 ppm, which requires high-resolution digital PWM (DPWM). I'm exploring the use of an external clock source such as the AD9576, which can provide a 1 GHz low-jitter clock output.

My questions are:

1. Can the TM4C1294NCPDT accept a 1 GHz external clock (e.g., via a timer input or GPIO configured for external clock)?

2. If yes, which peripherals or timers can use this high-frequency input, and what are the limitations (e.g., max frequency supported, sampling constraints)?

3. Is it feasible to use such a high-frequency clock to increase PWM resolution at a switching frequency of ~50 kHz?

4. If not directly possible, are there recommended alternatives or best practices for achieving sub-nanosecond DPWM resolution with the TM4C series?

Any guidance or insight from the community or TI experts would be appreciated.

Thanks in advance!