Abstract
An overview of the electronics readout/trigger architecture for the CMS HGCAL will be given. To respond to physics performance requirements, data rates, trigger-primitive generation and radiation tolerance has been extremely challenging. Each HGCAL endcap includes ∼300 m2 of active silicon in 50 layers, with a largely inhomogenous layout with limited commonality between layers. An agile, python-based counting scheme was implemented that creates tables of component counts. These are subsequently incorporated in the architecture specifications document and costbook, providing critical input to the mechanical design and integration optimisation.
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