Is there a Programmer's Guide available for the ConnextX-5 series of cards

I have found “Mellanox Adapters Programmer’s Reference Manual (PRM)” but is Revison 0.40 from 2016 and specifically mentions “Supporting ConnectX®-4 and ConnectX®-4 Lx”. I’m looking to see if there is a newer version of this document that includes any changes for the ConnectX-5 series of cards. If not, will this document also apply to the newer 5 (and 6) series?

Hello Leonard,

Thank you for posting your inquiry on the NVIDIA Networking Community.

Yes, there is a recent version which describes all the adapters including the ConnectX-5/6/Bluefield.

This document is only available for customers with a valid support contract. In case you have a valid support contract, please send an email to networking-support@nvidia.com and it will be provided through the ticket.

Thank you and regards,

~NVIDIA Networking Technical Support

Still only available for customers with a valid support contract now?
and where can we buy the support contract?