<![CDATA[Semiconductor manufacturing equipment demands deterministic real-time control architectures capable of synchronizing multi-axis motion, power delivery, and process sensing within microsecond-level timing windows to achieve the precision required at advanced technology nodes. EtherCAT, an industrial Ethernet protocol designed for hard real-time fieldbus communication, provides the deterministic, low-jitter communication fabric necessary to meet these stringent timing requirements across distributed embedded control nodes. This paper presents the design and implementation of an EtherCAT-based control architecture for high-precision semiconductor manufacturing systems, with a specific focus on RF impedance matching control deployed on a heterogeneous system-on-chip platform integrating the Xilinx Zynq-7000+ SoC. The proposed architecture implements a precision closed-loop control system that dynamically regulates RF voltage by actuating variable capacitors via stepper motor drivers with optical encoder feedback, enabling deterministic EtherCAT-controlled, synchronized, and independent actuation modes across multiple control axes. The Zynq-7000+ platform leverages its heterogeneous processing architecture — combining ARM Cortex-A9 application processors with FPGA programmable logic — to implement time-critical EtherCAT slave communication and closed-loop control algorithms in hardware while managing higher-level coordination logic in embedded software. Experimental results demonstrate sub-microsecond cycle-time repeatability, RF voltage regulation accuracy within 0.5% of the setpoint, and stable closed-loop tracking performance under dynamic impedance load variations representative of plasma etch and deposition process conditions. The architectural principles and implementation methodology established in this work provide a replicable framework for deploying deterministic EtherCAT-based control in semiconductor process equipment requiring distributed, high-precision motion and power regulation.]]>
