This sianal, when true loaelher wilh SEEK COMPLETE. indicalell thai
the drive is ready 10 Read, Wrile or Slep and lhal all conlrol inpul sill- •
nals are valid. When Ihis line is Ilia/!, all radinl. wrilinl and !teppinl
are inhibiled. The maximum lime after power-on ror READY 10 be
lrue is 24 seconds.I'
Durinllhe power-up sequence, READY remains raise unlil:
I. The recaJibralioD 10 Track" is complete
2. Spindle speed is slable within
± I'" or nominal
3. Drive inilialwliion roulincs arc complciC
4. DC vollagcs are wilhin lolerance
GROUNO
SIGNAL
RTN I'IM
PIN SIGNAl. NAME
2
I
-DRIVE SELECTED
4
3
RESERVED
8
5RESERVED
8
7
RESERVED
10
9
RESERVED
12
II
GROUND
13
+MfM
WRITE DATA
14
- MFMWAITE DATA
16
15GROUND
17
+ MFM
READ DATA
18
-MfM READ DATA
20
19
GROUND
TABLE: 2
J2 Host/Drive Pin
Assignments
READY
SEEK COMPLETE
$.5
5.6
This signal nOli6es Ihe hosl syslem Ihat • condilion exists which, ir nol
correcled, may cause an incorrecl Wrile operalion.
This signal IOCS 10 • low level (Irue) on Ihe interrace when the
ReadfWrile heads have seuled on Ihe 6na11rack at Ihe end or
IIseck.
Seeking. readil.o or wriling should nOI be altempled when SEEK
COMPLETE
:s false. SEEK COMPLETE will go raise in the rollowinl
cascs:
I. When a recalibralion sequence is inilialed (by drive 101ic) al
power-on
2. IOOnsectypical after Ihe leading edge or a Slep pulse
3. Ir eilher
+S Volls or + 12 Volts are detected as unsafe
4. At the beginning and end of a RECOVERY MODE operalion
WRITE FAULT SIGNAL GENERATION 5.7.1
With DRIVE SELECT active. and anyone orlhe following condilions
true, the WRITE FAULT signal will be issued to Ihe inlerface and
Wrile Currenl will be inhibiled.
i.Wrile Gale lrue wilh no Wrile Current to Ihe heads
2. Wrile Currenllo Ihe heads willi no Write Gale
3. An altempllO Wrile willi RECOVERY MODE active
4. SEEK COMPLETE false
S. A Slep pulse is received
WRITE fAULT remains lrue unlillhe condition which lriggered the
raull is correcled and Ihe resel is completed.
FIGURE 7:
HOST
IT22S
-
Data Signals
FLAT RIBBON OR
TWISTED PAIR 20 FT .•••• X
-DR~2RESERVED
---
RESERVED
I
•
RESERVED
---
RESERVED
•
RESERVED
10
GROUND
11
12
+MFM WRITE DATA
13
I
I J~
- MFM WRITE DATA
l'
GROUND
IS
"
+ MFM READ DATA
17
-MFMREADDATA
II
GROUND
,,1
II (t
20
J..
-
I
I
<.
WRITE FAULT
WRITE CURRENT INTERRUPTION
5.7
U.1.1
10
ml' OEMIR".F
sril' OEAlI~".,.
Anyone of IIIe followin. condilions will cause Wrile Currenllo be in·
hibited when Wrile Gale is lrue:
I. Mulliple hcaduelected
2. No head selected
3. READY false
III. no 24 •••• _ .1_ 1 h n~ r••• ,•••""'" I•••••••••••••• ,..
_ ••••••••• ,,1, ••• iIII•••••••••••• 11iri :!: "" ""- ~
23
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