Quadrature Encoder Interface (QEI) Core

CoreQEI implements a configurable quadrature encoder interface (QEI) core for motor control applications. The QEI decodes speed and motion sensor information for motors, and can be used in any application that uses a quadrature encoder for feedback. CoreQEI supports two phase signals (QEA and QEB) plus an index signal, all three with configurable noise filters. CoreQEI detects and signals the direction of movement, generates a direction change interrupt signal, and incorporates a 16-bit up/down position counter. CoreQEI also supports standard and high precision position tracking modes, x2 and x4 position update modes, and motor shaft velocity measurement with programmable down-sampling postscaler for high speed velocity measurement.

CoreQEI supports an advanced microcontroller bus architecture (AMBA3) advanced peripheral bus (APB) slave interface.

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