HEAD SELECT USING DIRECTION SELECT
During a Read or Writ e operation, the state of the Direction Select line is undefined. Hence, it may be
used to select
the desired head. A high enables Head 0. A low enables Head 1. To incorporate this
o ption, etch cut S2 and install Sl .
S1
S2
X
S3
1B
2B
3B
4B
X
X
X
X
X
X
HEAD SELECT
Head Select via J1-14.
Head Select via J1-26.
Head Select via J1-28.
Head Select via J1-30.
Head Select via J1-32.
Head Select via J1-34.
X
STEPPER MOTOR POWER
(PS, PS*, DS, HL)
turn off delay of the spindle motor is activat ed
o n th e t r a i l i n g e d g e o f t h e M o t o r C o n t r o l
signal.
W ith M o t o r C o n t r o l u s i n g D r i v e S e l ec t o r
Head Load, the M3 and M4 jum pers determine
which method of M o tor Control i s enabled. If
o ption M 3 o r M 4 j u m p e r s ar e i n s t a l l ed, t h e
Motor On Control, MC1 — MC4, options operate
i n a
l o g i c a l O R m a n n e r w i t h t he c o n t r o l
signal(s)
selected by the M3 and M4 jumpers.
When t h e
P S j u m p e r i s i n s t a l l ed , s t epper
motor power is controlled by th e D r iv e Select
l ine, DS, or t h e H e a d L o a d l i n e , H L . W h e n
e ither l in e i s t r u e ( l o w), th e stepper motor i s
driven with f ul l power, and is ready for a Seek,
R ead, or Wr it e operation. When eit her l i n e i s
false (high), + 5 v o l t s t a n d-by curr ent i s sup-
plied to
the stepper motor to hold the head car-
r iage assembly i n
p o s i t i on . W h e n t h e P S *
option i s i n , t h e s t e pper m o tor c o n t i n u ously
receives full power. PS* is diametrically oppo-
site PS (see Figures 3-3 and 3-4).
NOTE
If the Motor Delay Ti mer option
(M1)
i s i n st a l l e d , t h e f iv e
second turn off delay is in effect
regardless of which M 3 /M 4 con-
figuration is implemented.
X
-
X
X
X
-
-
X
SPINDLE MOTOR CONT ROL OPTIONS
(M1, M3, M4, MOL, MOH, MG1 — MG4)
PS PS~ D S
HL STE P PER POWER
Stepper Power
continuously on.
Stepper Power on with
Drive Select.
Stepper Power on with
Head Load line J1-18.
X
X
X
X
M1
M3
M4
MOTO R C ONTROL
Enables five-second
motor off
delay timer.
Motor Control only
with MC1 — M4 options.
Motor Control using
Drive Select.
Motor Control using
Head Load.
Motor Control using
Drive Select and Head
Load, l ogical AND.
Ml is used to enable the motor off delay tim er.
When thi s j u m per i s i n s t a l l ed, a f i v e second
3-10
