FUJITSU MPD3XXXAT - Manual (Page 64)

C141-E069-02EN 4 - 19
POS
C
PAD
POS
D
POS
B
POS
A
2.85
µ
s 0.45
µ
s 2.80
µ
s
Write/read
Recovery
1.80
µ
s 1.80
µ
s 1.80
µ
s 1.80
µ
s 0.60
µ
s
Gray Code SMK1 SMK2
0.60
µ
s
Servo
Frame
DATA DATA DATA
Servo
Frame
115.7
µ
s
14.50
µ
s
Figure 4.7 Servo frame format
(1) Write/read recovery
This area is used to absorb the write/read transient and to stabilize the AGC.
(2) Servo mark (SMK1, SMK2)
This area generates a timing for demodulating the gray code and position-demodulating Pos A
to D by detecting the servo mark.