Stepper motor HDL output behavior: Depending on the ________, the IC changes output states on each input pulse to realize different stepping schemes (wave, full, half). Choose the most appropriate word.
Digital Electronics
Digital System Projects Using HDL
Difficulty: Easy
Choose an option
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Amode
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Binput
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Coutput
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Dmake
Answer
Correct Answer: mode
Explanation
Introduction / Context: Stepper drivers implemented in HDL usually support multiple stepping schemes such as wave drive, full-step, and half-step. The driver’s response to each clock/pulse depends on the currently selected operating configuration.
Given Data / Assumptions:
- The driver is pulse-driven: one pulse → one transition in the state machine.
- Different modes map pulses to different coil energization sequences.
- “Mode” is often chosen via configuration inputs or registers.
Concept / Approach: Mode selection determines the active state table inside the controller. In wave mode, only one coil energizes per step; in full-step, two coils energize for higher torque; in half-step, the controller alternates one- and two-coil states to double resolution. Thus, the generic blank is best filled by “mode.”
Step-by-Step Solution:
Identify the driver mechanism: state machine advanced by pulses.Map pulse→state transitions according to the selected mode.Observe that changing mode alters the sequence without changing pulse count.Therefore, the missing word is “mode.”Verification / Alternative check:
Review typical HDL enumerations: MODE_WAVE, MODE_FULL, MODE_HALF choosing among different lookup tables.Why Other Options Are Wrong:
input / output: Too generic; both exist regardless of scheme and do not name the configuration.make: Not a technical term for operating configuration.Common Pitfalls:
Forgetting to reset the phase index when switching modes on the fly.Ignoring current limits and torque differences among modes.Final Answer:
mode