The New Version of the LHCb SOL40-SCA Core to Drive Front-End GBT-SCAs for the LHCb Upgrade

The LHCb experiment is currently engaged in an upgrade effort that will implement a trigger-less 40 MHz readout system. The upgraded Front-End Electronics profit from the GBT chipset functionalities and bidirectional optical fibers for readout, control and synchronization. This paper describes the new version of the firmware core that transmits slow control information from the Control System to thousands of Front-End chips, discussing the implementation that expedites and makes the operation more versatile. The detailed architecture, original interaction with the software control system and integration within the LHCb upgraded architecture are described.