I'm designing a card adaptor which converts from M.2 Key E type to M.2 Key M type (to insert an NVMe SSD into a port designed originally for Wifi cards).
I found some reference design for the M.2 KeyM socket:
- If I only wish to use this converter for NVMe SSD (PCIe), can I leave open
PEDET(pin 69), or pullup is required?
- If my design will only connect pins from keyE to this keyM socket, are C[317..343] needed or can be left out?
Reason for these questions: I earlier used a design made by CRImier (thank you):
And it doesn't use any single pullup-resistor or capacitor (while it still works as intended).
nvme_ae_to_m: v2, fixed tx/rx pair swaps, removed caps
So author used capacitors, but eventually he decided to remove those for some unknown reason.