To the people who are implementing a stepper motor. Maybe the following block diagram will help you. I got it from Michelle Kim at Hawaii University

Revised FPGA modular diagram and datapath

The controller takes the given inputs and passes these values directly to the speed calculator. The speed calculator outputs direction and speed values and a send bit to the 4-bit register. As explained previously, the register takes these inputs and holds them until a different input is given. The speed values are passed to the select lines of the 8:1 multiplexer and to the LED logic device. The directional value is passed to the state machine. The LED logic device takes these speed values and outputs the proper sequence for the 7-segment display, which are also outputs for the controller. Concurrently, the counter is incrementing, clocked on the 12 MHz FPGA clock, and the seven highest order bits are outputted to seven of the eight inputs of the 8:1 multiplexer. The first input is a constant value of "0". Then the multiplexer checks the value of the speed given to it by the 4-bit register and outputs the correct input based on the value of the speed. The output of the multiplexer is passed to the clock input of the state machine. The state machine then, in turn, checks the directional input and outputs the motor sequence timed to its clock. These four outputs of the state machine are also outputs of the controller module.

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Amit, Mandeep & Usama