We will design a carrier card to mount ORIN Module on it. Now we are getting into detailed design phase, and need to lock down reset design. After power-up, our carrier board will need to extend board reset timing longer than what ORIN module drives SYS_RESET_L.
1), In this case, it is clear from NVIDIA Design Guide, user should extend timing on the PERIPHERAL_RESET_L pin, don’t need to control the SYS_RESET_L pin (Design Guide V1.2, Session 5.1, page 19)
2), but the Devlopment Kits P3737 doesn’t drive PERIPHERAL_RESET_L pin at all. Its reset logic (PLD circuitry) drives SYS_RESET_L pin from P3737 carrier card.
This may not be right or wrong thing here, but what reset strategy should user carrier card use? Wondering why there are two different approaches, Guide document recommends one-way, and the reference design adopts the other way. User will need a bit insight what’s the difference between these two approaches.