Reconfigurable CORDIC architectures for multi-mode and multi-trajectory operations

This paper presents reconfigurable CORDIC (Coordinate Rotation Digital Computer) architectures which can be configured to operate either for circular or hyperbolic trajectories in rotation as well as vectoring-modes. We propose three reconfigurable CORDIC designs: a reconfigurable rotation-mode CORDIC that operates either for circular or hyperbolic trajectory, a reconfigurable vectoring-mode CORDIC for circular and hyperbolic trajectories, and a generalized reconfigurable CORDIC that can operate in any of the modes for both circular as well as hyperbolic trajectories. The reconfigurable CORDIC can perform the computation of various trigonometric and exponential functions, logarithms, square-root, etc. of circular and hyperbolic CORDICs using either rotation-mode or vectoring-mode of operation in one single circuit. It can be used in digital synchronizers, graphics processors, scientific calculators and many other applications, with significant area saving over that of using two CORDICs for different trajectories.