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3 servo frame format – FUJITSU MPG3XXXAH-E User Manual

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C141-E116-01EN

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4.7.3

Servo frame format

As the servo information, the drive uses the two-phase servo generated from the gray code and Pos
A to D. This servo information is used for positioning operation of radius direction and position
detection of circumstance direction.

The servo frame consists of 5 blocks; write/read recovery, servo mark, gray code, Pos A to D and
PAD. Figure 4.6 shows the servo frame format.

Pos

C

PAD

Pos

D

Pos

B

Pos

A

1.81

µ

s

0.17

µ

s

0.16

µ

s

0.72

µ

s

R/W Recovery Field

0.56

µ

s

0.56

µ

s

0.56

µ

s

0.74

µ

s

0.80

µ

s

PA

SSM

ASM

SCD

0.53

µ

s

Servo

Frame

DATA

DATA

Servo

Frame

86.81

µ

s

6.63

µ

s

Figure 4.6

96 servo frames in each track