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C141-E116-01EN 4 - 17
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 µs
0.17 µs
0.16 µs
0.72 µs
R/W Recovery Field
0.56 µs
0.56 µs0.56 µs0.74 µs
0.80 µs
PA
SSMASM
SCD
0.53 µs
Servo
Frame
DATA DATA
Servo
Frame
86.81 µs
6.63 µs
Figure 4.6 96 servo frames in each track