Servo control circuit | Fujitsu MPF3XXXAH manual

4.7.1Servo control circuit

Figure 4.4 is the block diagram of the servo control circuit. The following describes the functions of the blocks:

(1)

										MPU
	(2)					(3)
			Servo					ADC		DSP
Head			burst							DSP
Head			burst							unit
			capture							unit
			capture



			Position Sense

CSR: Current Sense Resistor

VCM: Voice Coil Motor

	SVC
	(4)	(5)	VCM current
		P.	VCM current
	DAC	P.
	DAC	Amp.
		Amp.
			CSR
			VCM
	(6)	(7)
	Spindle	Driver	Spindle
	motor		Spindle
	motor		motor
	control		motor
	control

Figure 4.4 Block diagram of servo control circuit

(1)Microprocessor unit (MPU)

The MPU includes DSP unit, etc., and the MPU starts the spindle motor, moves the heads to the reference cylinders, seeks the specified cylinder, and executes calibration according to the internal operations of the MPU.

The major internal operations are listed below.

a.Spindle motor start

Starts the spindle motor and accelerates it to normal speed when power is applied.

b.Move head to reference cylinder

Drives the VCM to position the head at the any cylinder in the data area. The logical initial cylinder is at the outermost circumference (cylinder 0).

C141-E106-01EN

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Fujitsu MPF3XXXAH manual Servo control circuit

Contents

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