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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 6 blocks; write/read recovery, servo mark, preamble, 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
2.12
µ
s
0.78
µs
0.84
µs
0.84
µs
0.84
µs
0.92
µs
0.80
µs
0.26
µs
0.24
µs
1.08
µs
W/R Recovery Field
Preamble
ASM SSM
Servo
Frame
DATA
DATA
DATA
Servo
Frame
115.7 µs
8.76 µs
SCD
Figure 4.6 Servo frame format