The high-granularity calorimeter (HGCAL), one of the most ambitious detector projects undertaken, will replace the endcap calorimeters of the CMS experiment for the upcoming high-luminosity LHC. Due to the extremely high number of readout and trigger channels, in combination with a high event rate and pile-up, the HGCAL requires a high-performance FPGA-based readout system. The CMS group at the Institute for Data Processing and Electronics (IPE) of the Karlsruhe Institute of Technology (KIT) in Germany contributes both to the development of firmware and software for the readout and control of HGCAL as well as to the design of the new Serenity-S1 hardware. In this contribution, I will discuss how we address the challenges in data readout that we are facing for HGCAL and highlight the contributions from IPE at KIT.
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