  A highly granular silicon-tungsten electromagnetic calorimeter (SiW-ECAL) is
the reference design of the ECAL of the International Large Detector (ILD)
concept, one of the two detector concepts for the detector(s) at the future
International Linear Collider. Prototypes for this type of detector are
developed within the CALICE Collaboration. During the last year a highly
compact digital readout system has been built. The system has been used for the
first time in a beam test in Summer 2019 at DESY. This article summarises the
main features of the system and report on its performance during the beam test.
