HP 7936 Support Manual page 107

S7937A33
DSRVP
(NOM SERVO)
ZCLK
DSRVP
(SECTOR MARK)
SMDT-H
ZDT-H
DSRVP
(NOM GUARD BAND)
ZCLK
(GBEN ASSERTED)
DSRVP
(GUARD BAND MARK)
GBD-H
ZDT-H
U
1 'I - - - ' 1 'I ---'11'------.Ul I
U U U
/\ f\ /\
1\
v
/\f\/\
VVV
1\
V
SECTOR MARK DETECT
DEDICATED SERVO CODE TIMING
U 1 I
U
Lr-
I
---'Lr- , ---.U
V\jV \Tvv V\} V V\}\1 \TV V
U
1\
v
GUARD BAND SERVO CODE TIMING
u
u
ur-j-----,u
u
u
1\
v
u
1\
v
Functional Description
7936 and 7937
" f\ /\
V\}v
L
L
f\ /\ f\ /\ f\ /\ f\ /\ f\ " f\ /\
1\
0
f\
0
n
0
f\
0
n
0
f\
0
nOn
0
non
0
1\ /\ 1\
0
v v \ j v \ j \ 1 \ j \ 1 \ j V \ j \ 1 V v \ j v v \ 1 \ j \ 1 v \ 1 \ j V v\1 V\J
V
V VV v \ J \ j V
1\ /\
f\
f\
A "
f\
0
f\ " f\ /\ 1\
0
non /\
f\
f\
f\ ./\
" 1\ f\
v
\ j
v
v
v
v V v
\j
GUARD BAND DETECT
r - - - I _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
~I
IL _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
---------~~----~ ~ ____ ~r__lL _________________________________ --------------______ __
Figure 5-14. Dedicated Servo Circuit Timing
5-75