Part Number: F29H850TU
where does these signals come from? I cannot find. By the way, I want to use diode mode to produce sync MOS driver. Is this the correct usage for diode mode ?

The EPWMx_DE.sync signal is the synchronized version of the selected TRIPH or TRIPL comparator signal, re-latched to the PWM clock domain by the diode emulation (DE) module.
EPWMxB_DB_NO_HR is the dead-band output of the EPWMxB channel after the DB submodule, but before any HRPWM adjustment is applied (if any).
And yes, this is the correct use case.