RPC Phase-2 Link System Remote Programming for the CMS HL-LHC Upgrade

The high luminosity LHC upgrade of the CMS RPC electronics system for the low-eta region includes the RPC link system upgrade and back-end electronics. The link system, as an off-detector electronics, comprises control boards and link boards. The electronics will be installed in the Compact Muon Solenoid (CMS) tower racks in the underground experimental cavern (UXC), and during the experiment run, there will be no access to these cards. Therefore, any further Field Programmable Gate Array (FPGA) firmware modification could only be carried out by remote programming techniques. Moreover, FPGA firmware must be designed to detect failures and automatically keep flashbacks of the original configuration memory. This work will explain how the remote programming procedure is implemented into the link system and how the RPC back-end electronics will handle it.