Seagate ST212 - 4.3.2 Slow-Step (Single-Track)

1 6Smsec avg. _1
r---170msec max. ---,
I-
SJLsec min.
SOOJLsec max.
100nsec min.
-STEP
- DIRECTION IN
( p?1'f f11
E
:
?A S_TA_B_L_E VU P?~·t f+~E ï//)
100nsecmin·--H- -1 1-2~~~~ -I1-100nsecmin.
1J
- DRIVE SELECT 1 1
-----
- SEEK COMPLETE
FIGURE 12:
General Step Timing
SLOW-STEP (Single-Track) 4.3.2
In Slow-Step, the stepper motor is settled and SEEK COMPLETE is issued 20
msec. max. after the leading edge
of the last Step pulse.
FIGURE 13:
Slow-step Timing
- DRIVE SELECi 1
--l L......
100nsec
min. -J L......
1oonsec
min.
- DIRECTION IN Il - Il.,.,.,,.,.,.,.,,.,...- ... -~,.,.,.,.,..,.,.,..,.
~;6M+'<~R~?J V///// //ffippe
T
,
911(1/ï)///lJ
_ STEP --.J j..-100nsec min. ~ 1-
100nsec
min.
U Lrll f f
La:~ ~.," "'""'~
'oo-""-Jf 1
- SEEK COMPLETE' -------------.,1 .... _
ST212 PRODUCT MANUALIRev. B
15