Sharp FDD-412A - Page 42

FDD412A/B
(4) HEAD 1 SELECT-N
[Write operation]
; (
HEAD]
|!
i
Li
|
SELECT-N
|
|
i
it
iT,
4
le
ieee
Sr
wa
;
Ra
a
t
i
t
Ty
To
Ts
T,; > 50 us... T3 > 50 Us
T2 > 0 T, > 580 us
'H' level = HEAD 0
"L' level = HEAD 1
Fig.
2.44
HEAD
1
SELECT
Signal
Timing
(5) STEP DIRECTION-N
STEP DIRECTION-N |
STEP-N 4 Faas
a
—|
T; > 50 ns
T2 > 0
"'H' level = in outer direction
'L' level = in inner direction
Fig.
2.45
STEP
DIRECTION-N
Signal
Timing
(6) STEP-N
STEP! -< «0 + (ee ee Se ee Si a
BIRECTIONSN =p a ge Se ee
STEP-N L
Tayi & T34 ~T3--—— Ta
— §
WRITE GATE-N tt T> —
—+Tp—
rt
!
T, > 50 ns * Ts > 580 us
.2ms > Tg > lus Te > O
T3 > 3 ms Tz : Read/write inhibit area
T, > 35 ms (settling-time)
Step pulse count =] Current cylinders' No. - New Cylinders' No.
Fig. 2.46 STEP-N Signal Timing
—36—