M2 1216 wireless network card to NGFF/M2 e-Key

M2-1216 originally only had one layer of pins. In order to support CNVio, Intel added the inner ring pins. Generally, those using the PCI-e protocol use the outer ring pins, and the power pins and some other pins are required.
Only NGFF/M2 e-Key supports CVNio, and neither PCI-e nor MINIPCI-e supports CNVio.
Regular PCI-e does not contain Bluetooth pins using USB2.0, so additional pins are required to be Bluetooth compatible.
The antenna seat is IPX4, while the MINIPCI-e is IPX1 and requires the use of an adapter cable. Desktop users also need to pay attention when purchasing.
Intel recommends adding two groups of capacitors, each with 10u, 0.1, and 0.01uf capacitors. Seeing that other solutions have not added too many capacitors, it depends on your own needs. It is recommended that small capacitors be added, preferably all capacitors, but it may not be useful.
Since M2 has two types of traces, the PCB is very crowded, and the small space is difficult to use. It is recommended to separate the CNVio type and the ordinary type if necessary. At the same time, some vias may be too small. After all, Jiali Chuang It only supports an inner and outer diameter of 0.2/0.4mm, and it is still relatively large in terms of miniaturization and high density. It is recommended to delete the line yourself.
Since these solutions are used to design PCI-e, my level is limited and I don’t have much experience in high-speed differential signal design. You are welcome to discuss them and make them into products.