ENCODER_INTERFACE

ENCODER_INTERFACE converts quadrature incremental encoder signals into rotor angle, direction, and speed feedback for field-oriented motor control systems. It is intended for designs that use an external encoder to track relative shaft movement and derive the electrical angle needed by the control loop. By decoding both signal transitions on the encoder channels, the core improves position granularity from a low-cost sensor and helps the controller respond to rotation direction changes. The architecture combines edge-based position tracking with speed estimation from angle change, then applies filtering to reduce quantization effects in the speed feedback path. It also supports startup alignment behavior so the motor control system can establish a usable electrical angle after rotor alignment. This makes the core valuable when the FPGA must offload time-sensitive sensing functions from the processor and provide deterministic feedback to motor control algorithms. Engineers can adjust scaling, counting, speed measurement, filtering, and initialization behavior to match the encoder and control strategy used in the design. The core is best suited for Permanent Magnet Brush Less DC and Permanent-Magnet Synchronous Motor applications that require reliable encoder-based feedback for field-oriented control and position-aware motion control.