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SIEMENS AKTIENGESELLSCHAFT

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Summary of Contents for 100-8

Page 1: ...SIEMENS ...

Page 2: ...SIEMENS Floppy Disk Drive FDD 100 8 INTRODUCTION OPERATION THEORY OF OPERATION INSTALLATION Technical Manual Volume 1 Model 100 8D ...

Page 3: ... C a r r i e r A s s e m b l y 1 9 O p t i o n s F e a t u r e s 1 9 W r i t e P r o t e c t 1 1 B i n a r y S e l e c t 1 10 R a d i a l S e l e c t 1 10 H a r d S e c t o r 1 11 16 8 S e c t o r 1 11 Auto E r a s e 1 11 D a t a S e p a r a t o r FM O n l y 1 11 Auto H e a d L o a d 1 12 A c t i v i t y I n d i c a t o r 1 12 P C B A s s e m b l y O pt io n C o n f i g u r a t i o n s 1 12 S p e ...

Page 4: ...Logic C o n v e n t i o n s 3 10 Detailed Logic D e s c r i p t i o n 3 10 Control L o g i c 3 10 S elect 3 13 Binary Select Option 3 14 Index Sector D e t e c t i o n 3 15 Hard S ector Option 3 16 Ready 3 16 A ctivity Indicator 3 18 Door Lock Option 3 19 D isk C h a n g e 3 19 R ea d W rite Head P ositioning Logic 3 20 Head L o a d 3 20 Track 00 Switch 3 20 Stepper Motor D rive 3 22 Interface Gat...

Page 5: ... 5 I n t e r f a c e Si g na l D e s c r i p t i o n s 4 6 L o g i c L e v e l s and T e r m i n a t i o n 4 6 I nput S i g n a l s 4 8 Output S i g n a l s 4 8 I n t e r f a c e T i m i n g 4 8 S y s t e m C o n f i g u r a t i o n s 4 1 2 S i n g l e D r i v e C o n f i g u r a t i o n 4 1 2 R a d i a l S e l e c t 4 1 2 D a i s y C h a i n e d R a d i a l S e l e c t 4 1 3 B i n a r y S e l e c...

Page 6: ...ontinued 4 INSTALLATION Continued T u n n e l E r a se Option 4 23 Write P ro te ct O p t i o n 4 23 D isk Change Option 4 24 P h a se O p t i o n 4 2 4 Installation 4 25 Mounting D i m e n s i o n s 4 25 Section Page vi ...

Page 7: ...nd Data T i m i n g 3 9 3 7 Interface Logic L e v e l s 3 10 3 8 Logic S y m b o l o g y 3 11 3 9 S elect L o g i c 3 13 3 10 Index D etection Logic 3 15 3 11 Index Tim ing 3 l o 3 12 Hard Sector and 16 8 Sector Option L o g i c 3 17 3 13 INDEX SECTOR T i m i n g 3 17 3 1 4 Ready L o g i c 3 18 3 15 Head Load L o g i c 3 19 3 1 6 T rack 00 L o g i c 3 21 3 17 Track 00 Tim ing 3 21 3 18 Stepper Mot...

Page 8: ...omain F ilte r Logic 3 35 3 3 6 FM Data Separator Option Logic 3 35 3 37 FM Data Separator Output Tim ing 3 36 3 38 Terminating R e s is to r N e t w o r k 3 37 4 1 Principal P a rts L o c a tio n 4 3 4 2 AC Connector J 2 4 5 4 3 DC Connector J 2 4 5 4 4 Interconnecting D i a g r a m 4 7 4 5 S in g le D riv e C o n f i g u r a t i o n 4 12 4 6 Radial S ele ct C o n fig u r a tio n 4 13 4 7 D a isy...

Page 9: ...s k L o a d i n g and U nl oa d i ng 2 3 3 1 D i s k D r i v e S e l e c t i o n 3 14 4 1 A C P o w e r R e q u i r e m e n t s 4 4 4 2 DC P o w e r R e q u i r e m e n t s 4 5 4 3 R e c o m m e n d e d J3 M a ti n g C o n n e c t o r s 4 6 4 4 I n t e r f a c e Input S i g n a l s 4 9 4 5 I n t e r f a c e Out put S i g n a l s 4 11 Table Page ix ...

Page 10: ......

Page 11: ... ch u s e s a fl op py d i s k as the s t o r a g e m e d i u m Th e s i n g l e r e m o v a b l e d i sk c a r t r i d g e will s t o r e up to 6 4 m e g a b i t s of d o u b l e d e n s i t y u n f o r m a t t e d d a t a 3 2 m e g a b i t s of s i n g l e d e n s i t y d a t a o r 1 94 m e g a b i t s usin g the c o m p a t i b l e I BM s y s t e m 3740 f o r m a t The d i s k d r i v e is a ls...

Page 12: ...ng the r e a d w r ite head to be loaded to the disk With the drive s e le c te d se c to r in d e x p u lse s w r ite p r o te c t sta tu s track 00 position status and a rea d w r ite ready status is supplied to the controller At the d esired tra ck a data tr a n sfe r operation is performed read to the con tro ller w r ite fr o m the co n tr o lle r depending on the state of the write command D...

Page 13: ...loppy disk is sealed The protective envelope contains apertures for spindle lo a d ing head contact s e c to r in d e x detection and optional w r ite p r o te c t detection see F igure 1 2 The recording m edia is a m a g n e tic o x id e c o a te d floppy flexible m y la r disk sealed within the plastic envelope for protection se lf c le a n in g and ea se of handling The disk should be handled a...

Page 14: ...Unformatted F lexib le D isk Cartridge GA21 9190 IBM O ne Sided Original Equipment Manufacturing Information E C M A T C 1 9 7 l 6 Data Interchange on 200 m m D isk C artridges using double frequency recording at 13 262 ftprad on one side Floppy disk c h a r a c te r istic s are liste d in Table 1 1 Table 1 1 Floppy D isk C h a r a cteristics Function C h a r a cteristics D isk Type ANSI Standard ...

Page 15: ...ta i n s 77 t r a c k s T h e f i r s t outside t r a c k is t r a c k 00 and the l a s t Inside t r a c k Ls 76 D u r i n g the w r i t e o p e r a t i o n an e r a s e coll in the r e a d w r l t e head e r a s e s the o u t s i d e e dg e s of the da ta j u s t w r i t t e n n a r r o w i n g the d a ta t r a c k In this m a n n e r a g u a r d band Is e s t a b l i s h e d to p r o t e c t the...

Page 16: ... to r 0 The index and se c to r holes are sen se d p h o to e le c tr ic a lly providing the pulses su p plied to the controller S ector Content The form at of each se c to r is determ ined by the application N o rm a lly pream bles and postam bles containing a str e a m of coded bytes are written at the beginning and end of each s e c to r to provide data synchronization Following the pream ble o...

Page 17: ... r a c k s b e c o m e f l a w e d t r a c k 76 is not us e d Th e IBM 3740 f o r m a t is sh ow n in F i g u r e 1 5 F o r d e t a i l e d i n f o r m a t i o n on the IB M 3740 da ta f o r m a t and i n i t ia l iz a ti o n r e f e r to I BM P u b l i c a t i o n GA 21 919 0 166 2 3 MSEC J L OPTICAL INDEX TRACK FORMAT BYTES J L POST INDEX SECTOR 1 SECTOR 26 TRAILING GAP 247 BYTES OF HEX FF OR 00...

Page 18: ...ll electronic circu itry required to convert the digital data input and output to and from analog data for the re a d w r ite head and head positioning information is contained on one circuit board Interface and DC connectors can be provided Logic is TTL with selec ted d is c r e te and IC Components The electro n ics perform the following functions Read Chain Write Chain Ready Generation Index De...

Page 19: ... r t r i d g e r e m o v a l Index and w r i t e p r o t e c t s e n s i n g by i n dep en d e n t L E D and p h o t o t r a n s i s t o r s e n s i n g c i r c u i t s Als o t r a c k 00 s e n s i n g C a r r i e r A s s e m b l y T h e c a r r i e r a s s e m b l y is a s e c o n d a r y f r a m e wh ic h pivots f r o m the m a i n d e c k a s s e m b l y a nd i n c l u d e s the following s u b...

Page 20: ...SELECT 3 lines contain a binary code betw een 0 and 7 When the SELECT 0 line is low true a decoder in the Binary Select option logic decodes the s e le c t code from the controller Radial S ele ct In the b a sic configuration the disk drive does not accept com m ands from the con tro ller and does not supply status signals to the co n tr o lle r until selected The purpose of this option is to allo...

Page 21: ...ine to the controller Auto E r a s e The e r a s e turn on and turn off delays are internally controlled by the E r a s e logic When the controller activates WRITE the leading edge of WRITE initiates a 2 0 0 m ic r o se c o n d e r a s e turn on delay the trailing edge of WRITE initiates a 5 3 0 m ic r o se c o n d e r a s e turn off delay If the str a d d le e r a s e configuration is used a s tr...

Page 22: ...is on when the drive Is selected The Activity Indicator option provides a m ea n s of substituting for the SELECT status sign al one of the following status signals HEAD LOAD RDY Etch pads are provided on the m ain printed circuit board to optionally OR either of the above signals with IN USE PC B A s s e m b ly Option Configurations The m ain printed circuit board can be supplied in a b a sic con...

Page 23: ... m u m 83 33 m i l l i s e c o n d s 175 6 m i l l i s e c o n d s Sin gle D e n s i ty D o ub le D e n s i t y A c c e s s T i m e T r a c k t o T r a c k T r a c k 0 T r a c k 76 38 T r a c k Mov e S e t tl in g T i m e Head L o a d T i m e 3 8 m i l l i s e c o n d s 456 m i l l i s e c o n d s 226 m i l l i s e c o n d s 14 m i l l i s e c o n d s I f f S 5 r p m s 25 m i l l i s e c o n d s 3...

Page 24: ...0 4V I n t e r f a c e L o g i c a l 1 T r u e 0 0V to 0 4V L o g i c a l 0 F a l s e 2 5V to 5 5V A C Input P o w e r S t a n d a rd 115V 90 127V 60 Hz 0 5 Hz 115V 90 127V 50 Hz 0 5 Hz O p ti o n al 230V 1 80 253 V 60 Hz 0 5 Hz 230V 180 25 3V 50 Hz 0 5 Hz V o l t ag e D r o p o u t 100 10 m i l l i s e c o n d s o n c e e a c h 600 s e c o n d s M o t o r C u r r e n t Max S t a r t 1 0 a m p e r...

Page 25: ... a l O pe r a t i n g N o n O p e ra ti n g T e m p e r a t u r e 40 to 115 F 4 4 to 46 1 C 32 to 150 F 0 to 6 5 C R e l a t i v e H u m i d it y 20 to 80 without c o n d e n s a t i o n 5 to 90 without c o n d e n s a t i o n A l tit ud e 10 00 to 1 0 0 0 0 feet 1000 to 4 5 0 0 0 feet Heat D i s s i p a t i o n D i m e n s i o n s an d W ei ght 300 B T U H o u r M a x i m u m NA D i m e n s i o n...

Page 26: ... 4 PLCS 7 47 8 55 14 00 DRESS BEZEL DIMENSIONS A 8 68 9 50 10 50 B 4 63 4 63 4 63 C 0 38 0 38 0 38 8 32 THD 2 PLCS PER SIDE DIMENSIONAL TOLERANCE 0 02 F igure 1 6 P h y sica l D im ensions and Mounting P r o v isio n s 1 16 ...

Page 27: ...r a g e m e d i u m Th e d i s k is s e a l e d in a p r o t e c t i v e e n v e l o p e in w h ic h a r e a c c e s s ho les f o r the r e a d w r i t e h e a d index and s e c t o r h o l e s di sk c e n t e r i n g h o le and optio n al w r i t e p r o t e c t slot see F i g u r e 2 1 F o r e x t e r n a l e r r o r f r e e o p e r a t i o n of the d i sk d r i v e the following d i s k handl i...

Page 28: ...d i s k is s e a l e d in the p r o t e c t i v e e n v e lo p e wit h a n a d h e s i v e la bel in the o u t s i d e left c o r n e r R e f e r to F i g u r e 2 1 The d i s k d r i v e will not o p e r a t e if the floppy d i s k is l o a d e d u p s i d e d o w n T h e c o r r e c t lo ad c o n d it io n s a r e sh ow n in F i g u r e 2 2 L o a d i n g a n d u n lo ad in g p r o c e d u r e s f...

Page 29: ...s p r i n g lo ad e d co ndition L o w e r f r o n t panel until l a t c h e d S pin d le con e l o w e r s an d c e n t e r s d i s k with f i r m p r e s s u r e D i s k r o t a t e s n o r m a l l y with i n t e r l o c k c lo s e d W r it e P r o t e c t W r i t e p r o t e c t g u a r d s a g a i n s t th e d e s t r u c t i o n of s t o r e d d a ta by c i r c u i t m a l f u n c t i o n s o...

Page 30: ...e i n f o r m a t i o n is inte nd ed to s e r v e as a t r a i n i n g guide f o r t e c h n i c a l p e r s o n n e l r e q u i r i n g i n d e p t h k n ow le dg e of th e d i s k d r iv e T h e d i s k d r i v e co n ta i n s t h r e e m a j o r s y s t e m s as sh ow n in F i g u r e 3 1 C o n t r o l S y s t e m P o s i t i o n i n g S y s t e m R e a d W r i t e S y s t e m F igure 3 1 Flop...

Page 31: ... S T E P IN D e te r m in e s r ea d w rite head direction HEAD LOAD P l a c e s disk recording surface in contact with HDLD r ea d w r ite head WRITE Enables write current to turn on and Inhibits WRT read output WRITE DATA Enables write data tra n sfer from con troller to WRT DATA disk drive SELECT and HDLD com m ands m ust precede a read or w rite operation SELECT enables all Input output g a te...

Page 32: ...d u r i n g d r i v e m a n u a l action In dex s ta t u s o c c u r s o n c e p e r d i s k r ev o l u t io n T r a c k 00 s t a t u s is a v a i l a b l e f o r in iti al izi ng the di sk c o n t r o l l e r t r a c k a d d r e s s r e g i s t e r T h i s sign al is d e v e l o p e d f r o m a p h o t o t r a n s i s t o r wh e n the c a r r i a g e is m e c h a n i c a l l y a li g n e d with t...

Page 33: ...ead attached to the ca rr ia g e a s s e m b l y contacts the recording surface when the drive is selected This command r e l e a s e s a spring loaded head load arm that m o v e s the floppy disk into contact with the r ea d w rite head READ W RITE SYSTEM The r e a d w r ite s y ste m records encoded data during a Write operation and r etr ie v e s data during a Read operation The write WRT signa...

Page 34: ... r i v e and a host d i s k c o n t r o l l e r M u lt ip le d i s k d r i v e s m a y be c o n n e c t e d in a r a d i a l o r d a i s y c h a i n e d c o n f i g u r a t i o n with in dividual s e l e c t i o n and s t a t u s m o n i t o r i n g The d i s k d r i v e r e q u i r e s o p e r a t o r i n t e r v e n t i o n o nly f o r l oad in g and un loadin g the floppy d i s k a f t e r whic...

Page 35: ...r i o u s d r i v e m o t o r s a r e a v a i l a b l e t h a t a c c o m m o d a t e p r i m a r y p o w e r r e q u i r e m e n t s of 115 and 230 volt s ac at 50 o r 60 H e r t z R o t a ti o n of the s p i n d l e is p r o v i d e d by a b e l t an d pu lley c o n n e c t e d to the d r i v e m o t o r r o t o r shaft se e F i g u r e 3 3 The d r i v e pu lle y is s e l e c t a b l e for e i t...

Page 36: ...t he d i s k m e d i a to the s p in d l e hub E n g a g e s the d i s k m e d i a to the s p i n d l e d r i v e s y s t e m As the c a r r i e r is pivoted to the load p o s i t i on the c e n t e r i n g cone e n t e r s the floppy d i s k c e n t e r J u s t p r i o r to the fully c lo s e d p o s it i o n of the h a n d l e the c e n t e r i n g cone e x p a n d e r is a u t o m a t i c a l l...

Page 37: ...e r m o t o r w i n d i n g s a r e p u l s e d d i c t a t e s r o t a t i o n a l d i r e c t i o n a n d s u b s e q u e n t l y h i g h e r o r l o w e r t r a c k a d d r e s s i n g f r o m t he r e l a t i v e pos ition He ad L o a d S y s t e m Th e hea d load s y s t e m i s b a s i c a l l y a so le n o i d d r i v e r and a s ole noi d W he n a c t i v a te d by the H D L D c o m m a n ...

Page 38: ...ERSE tn T Hinj jr 1 M S MIN il _L J 3 ms MIN U I 8 ms MAX I 1 I I 30 ms MIN tZZT READ DATA I 200 ms TUNNEL ERASE 0 ms STRADDLE ERASE ERASE h 1 BIT TIME M AX READ DATA I I 50 ms MIN V T J i U 530 ms TUNNEL ERASE 0 ms STRADDLE ERASE II 4 MICROSECONDS FM 2 MICROSECONDS MFM 8 MICROSECONDS FM 4 MICROSECONDS MFM WRITE DATA 2 BIT TIMES MIN F i g u r e 3 6 C o n t r o l and Da ta T i m i n g 3 9 ...

Page 39: ... threshold is con sidered a logical z e r o and a voltage m o r e negative than 0 4 volts turn on threshold is considered a logical one see F igure 3 7 The logic sym bology used in the disk drive is shown in Figure 3 8 Each elem ent is describ ed and all conditions are defined DETAILED LOGIC DESCRIPTION The detailed logic descrip tion is divided into three m ajor functions Control Logic R ead W ri...

Page 40: ...A GOES LOW B GOES HIGH FOR X TIME AND C GOES LOW FOR X TIME CROSS COUPLED LATCH B O T H SET A N D R ES ET H IG H NO C H A N G E SET IN P U T LOW Q IS H IG H A N D Q IS LOW RESET LOW Q IS LOW A N D Q IS H IG H BO TH SET A N D RESET LOW Q A N D Q B O TH H IG H LIGHT EMITTING DIODE IF A IS MORE POSITIVE THAN B LIGHT IS EMITTED IF B IS MORE POSITIVE THAN A NO LIGHT IS EMITTED D FLIP FLOP D HIGH AN D C...

Page 41: ...1 PHASE OPT HDLD 11 18 INPUTS THE DERIVATION OF THE INPUTS IS EXPLAINED IN OTHER SECTIONS OF THIS MANUAL OUTPUTS A BRIEF DESCRIPTION OF A L L OUTPUTS AND THEIR EQUATION IS LISTED BELOW HDLD LHD LD SEL OPT DOOR CLOSED READ WRITE HEAD LOADED IF DRIVE IS SELECTED IF A HEAD LOAD COMMAND IS RECEIVED AND PROVIDED THAT THE ACCESS DOOR IS CLOSED T R K 0 0 LTRK 00 PHASE A TRACK 00 SIGNAL SENT TO CONTROLLER...

Page 42: ...h r o u g h O P T D and is i n v e r t e d by 5A c a u s i n g a low S E L E C T si gn al to inhibit all d i s k c h a n g e r e a d y index s e c t o r w r i t e p r o t e c t and t r a c k 00 logic I n v e r t e r 6 b o u tp u ts a high S E L E C T to inhibit all head l o a d s t e p d o o r i n t e r l o c k and a c t i v i t y L E D logic As s h ip p e d f r o m the f a c t o r y a j u m p e r...

Page 43: ... binary coded a d d ress on three se le c t lin e s SELECT 1 through SELECT 3 and decodes them to produce a low output decim al equivalent corresponding to the d esired ad d ress The jumper plug is rem oved from the radial se le c t option and installed between the pads d esired to a s sig n the independent physical a d d ress of the disk drive Table 3 1 indicates the logic state of the SELECT lin...

Page 44: ...y the ou tp ut of the a c t i v a t e d p h o t o t r a n s isto r R e s i s t o r R32 s u p p l i e s b i a s c u r r e n t to the L E D W h e n the m e d i a b l o c k s the L E D ou tp ut f r o m the p h o t o t r a n s i s t o r the input to the c o m p a r a t o r is high W h e n the index hole is s e n s e d the input to the c o m p a r a t o r is low R e s i s t o r s RI O R9 and R l l p r ...

Page 45: ... d i v i d e r logic T h e ou tp ut of INDEX gate 2C is input to i n t e r f a c e I NDE X line d r i v e r 7B an d the R e a d y logic S E C T O R ga te 2C p r o v i d e s the S E C T O R p u l s e inputs to i n t e r f a c e S E C T O R line d r i v e r 7B if the 3 2 s e c t o r j u m p e r is i ns ta lle d T he output of S E C T O R ga te 2C a ls o d r i v e s the c l o c k input to the 16 o r ...

Page 46: ...F i g u r e 3 12 H a r d S e c t o r and 16 o r 8 S e c t o r O ption L o g ic 2 6 i 0 065 MS F i g u r e 3 13 I N D E X S E C T O R T i m i n g 3 17 ...

Page 47: ... d not be s e l e c t e d by the c o n t r o l l e r until the d i s k is u p t o s p e e d and r e a d y O p t i o n a l ly j u m p e r C c a n be i n s t a l l e d to d i s a b l e INDEX and S E C T O R until RDY is a c tiv e T he A c tiv ity L E D o p tio n c a n be c o n n e c t e d to u s e the RDY s ig n a l to a l e r t the o p e r a t o r w hen th e unit is u p t o s p e e d and r e a d y ...

Page 48: ... u r e 3 1 5 The IN USE s ig n a l is a c o n t r o l l e r s t a t u s input D o o r L o c k The d o o r lock o p tio n when i n s ta lle d is a c ti v e w hen the a c t i v i t y i n d i c a t o r is on W h e n a c t i v e this o p tio n p r e v e n t s the o p e r a t o r f r o m o p e n in g the d o o r R e f e r to F i g u r e 3 1 5 D is k C hange T h is s ig n a l n o tifie s the c o n t r o...

Page 49: ... a d T h e f u n c t i o n o f the h e a d lo ad lo g ic is to a c c e p t the H D L D c o m m a n d f r o m the c o n t r o l l e r a n d e n e r g i z e th e h ead lo ad s o le n o id T h e e n e r g i z e d s o le n o i d r e l e a s e s the h e a d lo a d a r m w h i c h b y m e a n s of a s p r i n g l o a d e d p r e s s u r e p a d g e n tly f o r c e s the m e d i a a g a i n s t the r e a...

Page 50: ... n a l is A N D e d i n t e r n a l l y w ith th e P h a s e A d e c o d e to p r o v i d e a T R K 00 outp u t The high o u tp u t of the LSI c i r c u i t e n a b le s g a te 6C to s e n d an a c t i v e t r a c k 00 s ig n a l to the h o st c o n t r o l l e r R e f e r to t im in g d i a g r a m F i g u r e 3 1 7 F i g u r e 3 1 6 T r a c k 00 L o g ic TRACK V 00 01 J___ L 02 03 04 05 J ___ L ...

Page 51: ... l i n g e d g e of the s t e p p u l s e a n d c l o c k s a 3 s t a t e c o u n t e r c a u s i n g f o r w a r d o r r e v e r s e s t e p p e r m o t o r p u l s e s a s d e t e r m i n e d b y th e S T E P IN i n t e r f a c e s ig n a l R e f e r to F i g u r e 3 1 9 f o r s t e p p e r t im in g W h e n S T E P IN b e c o m e s a c t i v e the c o u n t e r is in the f o r w a r d m o d e S...

Page 52: ...e LSI c hip s e r v e s to d i s a b l e w h e n lo w the P h a s e A P h a s e B and P h a s e C o u tp u ts S t e p p e r M o t o r D r i v e r s T he s t e p p e r m o t o r is a 3 p h a s e m o t o r h a v in g t h r e e in d e p e n d e n t and i d e n t ic a l d r iv e c i r c u i t s s e e F i g u r e 3 20 P h a s e A d r i v e logic is c o m p r i s e d of d r i v e r 6 E pull up r e s i s...

Page 53: ...io n w ith e a c h S T E P p u l s e T h r e e w in d in g s a r e p r o v id e d w ith the c e n t e r t a p s c o n n e c t e d to 24 v o lts d r i v e p o w e r T h e t h r e e w in d in g s a r e e n e r g i z e d s e q u e n t i a l l y p r o d u c i n g a s te p p e d f o r w a r d o r r e v e r s e a c ti o n T h e b i d i r e c t i o n a l s h a ft r o t a t i o n is d e p e n d e n t on t...

Page 54: ...b l e c o m m a n d T he r e a d w r i t e lo g ic p e r f o r m s two p r i m e fu n c tio n s W r i t e c o n t r o l l e r d a ta on the d i s k R e a d r e c o r d e d d a ta f o r the c o n t r o l l e r F i g u r e 3 21 s h o w s the w r i t e in itia te t im in g p e r a t i o n is i n itia te d by the d i s k c o n t r o l l e r b y a c t i v a t i n g th e W R I T E and W R T DA TA i n t ...

Page 55: ... a n d in h ib itin g w r i t e g a te 4D se e F i g u r e 3 Z2 W h e n th e d i s k c a r t r i d g e w r i t e p r o t e c t s lo t is c o v e r e d o r a n o n w r i t e p r o t e c t c a r t r i d g e is u s e d the p h o t o t r a n s i s t o r is i n a c t i v e and th e n e g a t i v e input to c o m p a r a t o r 3A is high T he o u tp u t p r o d u c e d is lo w e n a b li n g w r i t e o...

Page 56: ...e f e a t u r e is to p r o v id e the n e c e s s a r y t u r n o n d e la y b e t w e e n a c ti v e W R I T E and E R A S E and the t u r n o f f d e l a y a f t e r W R I T E g o e s in a c t iv e but f o r t u n n e l e r a s e h e a d s only T h is is w ith o p tio n T E i n s t a l l e d S t r a d d l e e r a s e h e a d s u s e o p tio n S E w h ic h b y p a s s e s the d e la y c i r c u ...

Page 57: ... t is t u r n e d on 200 m i c r o s e c o n d s a f t e r a n a c t i v e W R I T E and r e m a i n s on un til 530 m i c r o s e c o n d s a f t e r W R I T E g o e s in a c tiv e T h e t u n n e l e r a s e d d a ta p a t t e r n is s h o w n in F i g u r e 3 2 5 T he c u r r e n t is on w h e n e v e r W R I T E is a c t i v e w ith the s t r a d d l e e r a s e o p tio n i n s t a l l e d DC ...

Page 58: ...ATA i n t e r f a c e line W hen the d r i v e is not s e l e c t e d w r i t e c u r r e n t flow is in h ib ited W hen th e d r i v e is s e l e c t e d i n t e r f a c e line r e c e i v e r 5A is e n a b le d and g a t e s W R T DATA to w r i t e flip flop 3D If the W R I T E c o m m a n d is a c t i v e the f li p f l o p is e n a b le d and the o u tp u t of Q6 d r i v e r 2D is low C u r r ...

Page 59: ...C o n t r o l L O I d r i v e r 2D a n d r e s i s t o r R60 f o r m a low w r i t e c u r r e n t c i r c u i t s e e F i g u r e 3 27 W h e n L O I is i n a c t i v e th e d r i v e r o u tp u ts a high and c u r r e n t d o e s n o t flo w t h r o u g h R60 In th is s t a t e th e l e v e l of w r i t e c u r r e n t is d e t e r m i n e d by R59 W h e n c o u n t e r s 6A and 7A d r i v e the ...

Page 60: ...i n g l y b o t h t r a n s i s t o r d r i v e r s p r o v i d e high o u tp u ts a n d b o th Q5 and Q 6 a r e t u r n e d off to s to p all c u r r e n t flow A l s o t r a n s i s t o r b i a s d r i v e r 2D o u tp u ts a low w h ic h p r o d u c e s a v o lta g e t h r o u g h R 60 a n d R 5 9 e n s u r i n g t h a t Q15 an d Q l 6 a r e b i a s e d off W r i t e d a ta t i m i n g and w r i...

Page 61: ... 3 1 T h e s o u r c e in p u ts to F E T s Q 9 a n d Q8 a r e c o n n e c t e d to th e c o ils of th e r e a d w r i t e head T h e o u tp u t d r a i n s a r e c o n n e c t e d to th e in p u ts of L S I c h ip IE W h e n th e d i s k d r i v e is o p e r a t i n g in th e W r i t e m o d e the o u tp u t of W R T g a te d r i v e r 2D is high B o th Q9 a n d Q 8 a r e in t h e off s t a t e t...

Page 62: ...DC POWER HDLD STEP WRITE RAW DATA F i g u r e 3 30 R e a d I n itia te T i m i n g READ TPB2 Figure 3 31 Read Logic Simplified Diagram 3 33 ...

Page 63: ...ork T h e d i f f e r e n t i a t i n g n e t w o r k F i g u r e 3 3 3 p r o v i d e s a 9 0 d e g r e e d e l a y to c o n v e r t th e I n c o m i n g r e a d d a t a s i g n a l p e a k s to d i s t o r t e d z e r o c r o s s i n g s f o r the c r o s s o v e r d e t e c t o r s e e F i g u r e 3 3 4 C a p a c i t o r C 3 6 I n d u c t o r L 2 a n d r e s i s t o r R95 f o r m a s e r i e s c...

Page 64: ... Ls to d i s r e g a r d f a l s e z e r o c r o s s i n g s In the RAW D A T A c a u s e d b y the high r e s o l u t i o n h e a d t o d l s k I n t e r f a c e T w o Inputs a r e r e c e i v e d f r o m the c r o s s o v e r d e t e c t o r T h e z e r o c r o s s i n g s a r e Input to a f l i p f l o p f r o m th e c o m p a r a t o r and th e c lo c k Input is f r o m th e o n e s h o t T h ...

Page 65: ...o w n in F i g u r e 3 3 6 5V F i g u r e 3 36 F M D a ta S e p a r a t o r Option L o g i c T h e p u r p o s e of the d a ta s e p a r a t o r is to s e p a r a t e th e RA W DATA p u ls e t r a i n of c lo c k a n d d a ta p u l s e s into s e p a r a t e c l o c k and d a ta p u l s e s W h e n e n a b le d b y S E L E C T input g a te 4E i n v e r t s th e p u l s e t r a i n f r o m th e t i...

Page 66: ... n a t i n g r e s i s t o r n e t w o r k f o r all input i n t e r f a c e lin e s F o r e a c h input lin e t h e r e is a ZZO ohm r e s i s t o r to 5 v o l t s a n d a 3 3 0 o h m r e s i s t o r to g ro u n d W h e n the d i s k d r i v e s a r e r a d i a l l y c o n n e c t e d to the conl roller a ll d r i v e s m u s t h ave the t e r m i n a t o r IC I n s ta lle d W hen the d r i v e s...

Page 67: ...o n t a i n e r d e s i g n e d to e n s u r e a d e q u a t e p r o t e c t i o n d u r i n g s h ip p in g and handling W hen the d i s k d r i v e l s i n s t a l l e d s t o r e the c o n t a i n e r and all p a c k in g m a t e r i a l f o r p o s s i b l e f u t u r e use I m m e d i a t e l y upon r e c e i p t i n s p e c t the c o n t a i n e r f o r a n y s ig n s of p o s s i b l e d a ...

Page 68: ... l r e l e a s e b utton O b s e r v e th a t c a r r i e r m e c h a n i s m o p e n s to i n s e r t floppy d i s k c a r t r i d g e and th a t c e n t e r i n g cone is r e l e a s e d f r o m s p in d le hub d I n s e r t d is k c a r t r i d g e fully O b s e r v e th a t s p r i n g l o a d e d la t c h is e n g a g e d and th a t d i s k c a r t r i d g e is s e a t e d p r o p e r l y o v...

Page 69: ...u s in g r e c o m m e n d e d c o n n e c t in g j a c k s p lugs and pins All input and o u tp u t l i n e s to i n t e r f a c e c o n n e c t o r J3 sig n a l s h o u ld be c a b le d u s in g o n e of the two fo llo w in g m e t h o d s T w i s t e d p a i r AWG 26 o r l a r g e r w ith at l e a s t one t w i s t p e r in c h f o r e a c h s ig n a l O n e w i r e c o n n e c t e d to a s s i...

Page 70: ...s c o n n e c t e d ac c o n n e c t o r pins P I f o r c o r r e c t input v o lta g e R e m o v e ac p o w e r w h e n c h e c k c o m p l e t e d A d j u s t v o l t o h m m e t e r to m e a s u r e dc v o lta g e a p p ly dc p o w e r and c h e c k d i s c o n n e c t e d dc c o n n e c t o r p in s P 2 fo r c o r r e c t input v o l ta g e s R e m o v e dc p o w e r w h e n c h e c k c o m p ...

Page 71: ... e r R e q u i r e m e n t s P i n No P2 Dc V o lta g e T o l e r a n c e C u r r e n t M a x i m u m R ip p le p p 1 24 V D C 1 2 VDC 1 6A M ax 100 m v 2 24V R et 5 5 VDC 0 25 VDC 1 0A M ax 50 m v 6 5V R et I n t e r f a c e S ig n a l C a b le A ll c o n t r o l l e r c o m m a n d s r e a d w r i t e d a t a and d i s k d r i v e s t a t u s s i g n a l s a r e t r a n s f e r r e d t h r o u g...

Page 72: ... l VIKING 3 V H 2 5 1 J N 5 NA F l a t C a b le 3M 3 4 1 5 0 0 0 1 NA S c o tc h fle x A M P 8 8 0 8 3 1 NA A ll c o n n e c t i o n s to and f r o m the r e a d w r i t e and c o n tr o l log ic p r i n t e d c i r c u i t b o a r d a r e s h o w n in F i g u r e 4 4 F i g u r e 4 4 is p r o v i d e d a s a n i n t e r c o n n e c t i o n d i a g r a m an d s h o w s t h a t e x c e p t f o r A C...

Page 73: ... I N P U T CHASSIS GND AC RET J7 A L L O D D PI N N U M B E R S A R E G R O U N D E D R E A D W R I T E A N D C O N T R O L L O G I C P O I N T E D C I R C U I T B O A R D C5 CH HUH W DR IVE 7 MOTOR LED OPTICAL TRACK 00 SWITCH P H O T O T R A N S READ WRITE HEAD w C t w c E w COM 0 A B c w w w w t DOOR CLOSE LED PHOTO TRANS OPTION WRT PROTECT LED PHOTO TRANS OPTION INDEX LED PHOTO TRANS STEPPER MO...

Page 74: ... RAW DATA line T h e c o n t r o l l e r I s s u e s one o r m o r e S T E P p u l s e s c a u s i n g the r e a d w r i t e h ead to b e m o v e d o n e o r m o r e t r a c k s f r o m its in itia l p o s itio n D u r i n g the 14 m i l l i s e c o n d s a f t e r th e s e c o n d S T E P p u l s e the h ead h a s s e t t l e d on the t r a c k a n d W R I T E Ls m a d e a c t i v e p l a c in g ...

Page 75: ...he h e a d lo a d a r m to b r i n g th e m e d i a into c o n ta c t w ith the r e a d w r i t e h ead s e e F i g u r e 3 1 5 A d e l a y of 25 m i l l i s e c o n d s is r e q u i r e d a f t e r the H D L D c o m m a n d b e f o r e d a ta c a n be r e a d o r w r i tt e n T o e n a b le H D LD the unit m u s t be s e l e c t e d A n a c ti v e H D L D is not r e q u i r e d If the s e l e c t...

Page 76: ... t is t u r n e d o n and off b y W R I T E G A T E f o r s t r a d d l e e r a s e O p t i o n a l ly f o r tu n n e l e r a s e h e a d s e r a s e c u r r e n t is t u r n e d o n 200 m i c r o s e c o n d s a f t e r W R I T E b e c o m es a c t i v e low a nd is t u r n e d off 530 m i c r o s e c o n d s a f t e r W R I T E b e c o m e s i n a c t iv e high s e e F i g u r e 3 24 T h e fo ll...

Page 77: ...in g is u s e d to s y n c h r o n i z e c o n t r o l l e r d a ta f o r m a t t r a n s f e r s DISK C H A N G E A c tiv e s t a t u s low i n d ic a te s th a t the d r i v e has j u s t b e e n p o w e r e d up o r th a t the d o o r has b e e n o p e n e d and c lo s e d w h ile the d r i v e w a s not s e l e c t e d S E C T O R Option T h i s lin e u s e d only if the h a r d s e c t o r o ...

Page 78: ...all c a b l e s a r e c o n n e c t e d d i r e c t l y to the d i s k d r i v e s e e F i g u r e 4 5 It is the s i m p l e s t f o r m of r a d i a l c o n f i g u r a t i o n T h e unit c a n be s e l e c t e d to a c c e p t c o m m a n d s and r e s p o n d w ith s t a t u s s i g n a l s S e l e c t e d head lo a d o r r a d i a l o p tio n s m a y be i n s t a ll e d In th is a p p l i c a ...

Page 79: ...u r a t i o n is s h o w n in F i g u r e 4 7 U n d e d i c a t e d l i n e s u n d e r s e l e c t c o n t r o l a r e d a i s y c h a i n e d A ll u n d e d ic a te d s ig n a l l in e s a r e t e r m i n a t e d in the l a s t d i s k d r i v e It is p o s s i b l e to i n s t a ll a n y two o f th e fo llo w in g r a d i a l o p tio n s w ith f o u r d i s k d r i v e s S T E P S T E P IN H D ...

Page 80: ... l t i p l e x e s the s e l e c t l i n e s to a ll o w up to e ig ht d i s k d r i v e s to b e in d iv id u a lly s e l e c t e d by a b i n a r y co de T h is c o n f i g u r a t i o n is s h o w n in F i g u r e 4 8 A ll s ig n a l l in e s a r e d a i s y c h a i n e d A ll s ig n a l input l i n e s a r e t e r m i n a t e d in the l a s t d i s k d r i v e 4 1 4 ...

Page 81: ...Figure 4 8 Binary Select Configuration 4 15 ...

Page 82: ...t io n s F i g u r e 4 9 s h o w s the P C B o u t l i n e a n d the unique m a n n e r by w h ic h an o p t i o n c a n b e i n s t a l l e d R e f e r to th is i l l u s t r a t i o n f o r the l o c a t i o n of e a c h optio n Note If a l t e r n a t e i o l i n e s a r e a s s i g n e d a s a n o p t io n th e r e s u l t a n t c o n f i g u r a t i o n s h o u ld be c h e c k e d f o r p r o...

Page 83: ...Figure 4 9 Interface internal Options 4 1 7 ...

Page 84: ...e c te d N o te T h is o p tio n c an not b e i n s t a l l e d if th e S T E P i o line is d a i s y c h a i n e d to two o r m o r e d i s k d r i v e s To i n s t a l l th is option a R e m o v e w i r e j u m p e r b e t w e e n v e r t i c a l RAD S T E P O P T 2 p ads RAD STEP f r b I n s t a l l a w i r e j u m p e r b e t w e e n the h o r iz o n t a l 1 p ads If m o r e th a n o n e d r i...

Page 85: ...O lin e p a d s PAD c I n s t a ll a w i r e j u m p e r b e t w e e n thev e r t i c a l B p a d s Do not p e r f o r m th is s t e p if s ig n a l t e r m i n a t o r is i n s t a ll e d R a d i a l R e a d y See F i g u r e 3 14 T h i s o p tio n a llo w s the r e a d y s t a t u s of the d r i v e to be s e n t to the h o s t c o n t r o l l e r w ith o u t the d r i v e b e in g s e l e c t e...

Page 86: ... r e d i s k d r i v e s T o i n s t a l l t h i s optio n Ri j a R em ove w ire jum per betw een v e r t i c a l RI p a d s Q If m o r e than one drive is configured in the s y s te m then only one drive m ay use J 3 i n t e r f a c e c o n n e c t o r pin 20 f o r the IN D E X l in e and pin 24 f o r th e S E C T O R line E a c h o t h e r d r i v e m u s t b e a s s i g n e d o n e of th e s p ...

Page 87: ...he u p p e r 18 pad an d one of th e s p a r e p a d I O lin e p a d s only f o r d r i v e s w ith o u t p a d s 18 j u m p e r e d c I n s t a l l a w i r e j u m p e r b e t w e e n th e h o r i z o n t a l M p a d s Do not p e r f o r m th is s t e p if s ig n a l t e r m i n a t o r is i n s t a ll e d Auto H e a d L o a d O p tio n See F i g u r e 3 15 T h i s o p tio n a ll o w s th e head ...

Page 88: ... r d iv id in g dow n to 1 6 s e c t o r s o r 8 s e c t o r s T h e H a r d S e c t o r o p t io n m u s t b e p r e v i o u s l y i n s t a l l e d To i n s t a ll th e S e c t o r S e l e c t op tio n a R e m o v e w i r e j u m p e r b e t w e e n hsQ Q p a d s 32 b I n s t a l l w i r e j u m p e r b e t w e e n e i t h e r s e c t o r p a d s 16 o r 8 a s d e s i r e d A c t iv i ty I n d i ...

Page 89: ... c o d in g To i n s t a l l th is o p t io n i n s t a ll a ll c o m p o n e n t s in th e F M D a t a S e p a r a t o r o p tio n kit T u n n e l E r a s e O p tio n s T h e i n s t a l l a t i o n of the t u n n e l e r a s e o p tio n m u s t e n s u r e th a t th e i n s t a l l e d r e a d w r i t e h ead c o r r e s p o n d s to the o p tio n s e l e c t e d a If a s t r a d d l e e r a s e...

Page 90: ...p er m o to r under cer ta in conditions The option can be connected to function in any one of the f o l low ing ways T o d i s a b l e th e c a p a b i lit y a To rem o v e drive power when the r e a d w rite heads a re unloaded install a I G w ire jum per b etw een the v ertica l O D G pads h b To rem o v e drive power when the disk d rive Is not se le c te d 1 R em ove the w ire jum per betw ee...

Page 91: ... s u c h a s V e r t i c a l w ith a c c e s s d o o r o p e n in g to le ft o r r ig h t H o r i z o n t a l w ith a c c e s s d o o r o p e n in g up U p r i g h t w ith a c c e s s d o o r o p e n in g t o w a r d s f r o n t o r r e a r M o u n tin g D i m e n s i o n s T h e d i s k d r i v e o u t li n e and m o u n ti n g d i m e n s i o n s a r e s h o w n in F i g u r e 1 6 4 25 ...

Page 92: ...nt may not be duplicated a ooans or its contents used or communicated Anaheim California 92805 others wjthout e ay 714 991 9700 _ Telex 685691 3ubj0ct to alterations SIEMENS AKTIENGESELLSCHAFT Reg No F 27 4 9 9 4 19 101 A22741 A1 00 D1 761 9 AG01 792 0 2 79 Printed in U S A ...

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