Catapult® C Synthesis added SystemC support for modeling, verification, and synthesis of complex ASICs at the system level. Both cycle-accurate and transaction-level (TLM) abstractions are supported, addressing SoC-specific needs such as bus interfaces and interconnects as well as connections with ESL flows. This Catapult flow promotes abstraction and design reuse. In this paper we will give an overview and a detailed example of SystemC support in Catapult.