Data General 6045 Series Technical Manual Download | Manualshive

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Summary of Contents for 6045 Series

Page 1: ...t DataGeneral...

Page 2: ...Technical Manual 6045 SERIES CARTRIDGE DISC SUBSYSTEM 015 000057 02...

Page 3: ...terials presented including but not limited to typographical or arithmetic errors company policy and pricing information The information contained herein on DGC software is summary in nature More deta...

Page 4: ...e car tridge disc subsystem and presents its physical limits and capabilities Chapter 2 Controller Overview Describes the general properties of the controller and includes a programming summary Chapte...

Page 5: ...rs Head Positioner and Servo Data Transcription Power Supply PART II CONTROLLER INTRODUCTION Dual Processor Logic Drive Command Logic Read Write Control Logic Data Transfer Logic Read Write Cyclic Red...

Page 6: ...Servo some details Differencer AROMs BROMs DAC Detent Servo some details Servo Drive some details SEEK COMMAND EXECUTION DRIVE DATA TRANSCRIPTION TWO FREQUENCY RECORDING READ WRITE MECHANISM Heads REA...

Page 7: ...Shutting Down the Disc Drive DISC CARTRIDGE CARE ANO HANDLING OPERATING NOTES MAINTENANCE Operator Maintenance Preventive Maintenance DOCUMENTATION RELATED DOCUMENTS DRIVE PRINTED CIRCUIT BOARDS LOGI...

Page 8: ...PART I 111111...

Page 9: ...1 Data General Corporiltion IOGCl h t s prepared this manual for us b OGC personnel nd c1 Jstom litlt t lht proper instalfation operation and maintenance of OGC equipment o1nd softwilre The drilwings...

Page 10: ...rough the data channel The Interface connects a Disc Drive to the Controller It conditions the controller s signals and contains logic to mediate drive access in a dual processor environment The Disc...

Page 11: ...AM _ DCH1 OCHl Al OIBiOCHA 1 MEMORY ADDRESS I I L 7 J 2F l L 9 1 CRC GENERATOR r x 16 x 8 1 L COMPARE v CRC ERROR _ f l d ADDRESS CHECK ADDRESS ERROR t II I WRITE ENCODER DATA J FDECODER l READ DATA v...

Page 12: ...header written on each sector The controller compares it to the address specified by the program The verify logic sends an error signal to the program and terminates the data transfer if the address...

Page 13: ...of Cylinder and Unsafe 1 4 Clear Seek Sets the Seek Done flags to O on drives 0 3 Done 0 3 respectively 5 Cylinder Most significant bit of cylinder address MSB Together with bits 8 15 specifies the de...

Page 14: ...read from the disc at the end Error of a sector does not match the checkword calculated by the controller during the sector transfer Data late The data channel failed to respond in time to a data cha...

Page 15: ...oduc d in whol or in p rt withqut OCC s prior writtf n o1 pprov I nor hf impti d lo gr111tt n t licenH to make use or st ll equipment m nufuturrd in ucord nce hnf with IMTERFACE 1 0 RIBBON CABLE DISC...

Page 16: ...er with the drive number on its select switch on the front panel of the drive The selected interface connects its drive to the bus The interface buffers all the signals on the bi directional controlle...

Page 17: ...pttifinlions cont ined herein re the property of OGC nd sh 11 neither bt rt prodUcrd in whole or in put wilhout OGC s prior writle n 1pproul nor b implied to gt nt ny lice nle lo m 1 e USt Of St ll eq...

Page 18: ...isc is changed The positioner control circuits locate the heads over selected tracks in response to commands from the drive console and the subsystem controller The data transcription circuits write e...

Page 19: ...ip during an unload cycle to provide dynamic braking and then apply direct current to stop spindle rotation The sector pickups send clock pulses to the spindle speed monitor and the sector counters Th...

Page 20: ...ained herein are the property of DGC and sh all neither be reproduced in whole or in put without OGC s prior written approval nor be implied to gr1nt i1ny license to mUe use or sell equipment rmnufutu...

Page 21: ...ack The position signal feeds a closed loop servo that detects offset errors and drives the positioner back on track A temperature difference between the disc surfaces and the drive can cause misalign...

Page 22: ...center ofeach cell containing a one The head select circuits activate one head at a time for reading or writing The write circuits receive 2F encoded data from the controller and induce a regulated c...

Page 23: ...PART II 19111...

Page 24: ...r Logic A bus arbiter located in the Interface controls access to a common set of drives in a dual processor system The controllers compete for access on a first come first serve basis The winner reta...

Page 25: ...roperty of DGC and shttll neither be reproduced in whole or in part without DCC s prior wntten 1pproul nor be 1mphed to gr ant 1ny license to make use or sell equipment rmnufactured in ucord nce herew...

Page 26: ...0 20 40 60 80 100 120 140 160 1BO 200 220 240 I I I I I I I I I I I I I SECTOR PULSE ONE WORD ADDRESS SYNC BIT SPLICE ADDRESS FIELD SYNC ZONE 18 DATA FIELD SYNC ZONE 23 WORDS OF ZEROES 1 120 1 S OF Z...

Page 27: ...ter When the 32 bit shift register becomes empty it immediately accepts the new data words and begins shifting them to the the data encoder This frees the holding register to receive two more words Da...

Page 28: ...he diagram to the right shows the CRC generator Feedback to the input and midpoint of a 16 bit shift register conforms to the generator polynomial During data transfer the generator processes the seri...

Page 29: ...051 V 6 60 sec Data General Corpor1 tion fOGO h 111 prepued this manu il for use by OGC personnel 1 nd customers is guide to the proper inst ill ition operation and m1 intenance of OGC equipment ind s...

Page 30: ...e or sell equipment manufactured in accordance herewith WRITE CONTROL TIMING DC STAT l DC BUSY b SECTOR PULSE n ti SECTOR EQUAL ADD CHK READ GATE SYNC DLY XFER ENB l z 1 AJ L ii l lJ_ r l 1i y 60 sec...

Page 31: ...lation operation and m intenaince of OGC ffiUipment and software The drawings nd specifintions cont ined herein re the property of OGC and shall neither be reproduced in whole or in put without DGC s...

Page 32: ...e bottom of the diagram The interfaces receive power from the drives and are both energized if either drive is powered up 5A The left select line applies power 5B to the arbiter logic in the leftmost...

Page 33: ...ance of DGC equipment and software The drawing and specifications contained herein ue the property of OGC and shall neither be reproduced tn whole or m part without DGC s prior written i1ppro al nor b...

Page 34: ...end of the spindle has a flange and a ring shaped permanent magnet The fixed disc is held to the flange by four retaining screws The cartridge disc has a metal hub which clamps to the permanent magne...

Page 35: ...s prior written 1ipproval nor be implied to grant ny license to make use or sell equipment m 11nub ctuttd in ucord nce herewith SPINDLE CONTROL BLOCK DIAGRAM LOADIRUN SWITCH DG 04069 DRIVE IN PLACE J...

Page 36: ...ckup senses holes in a plate below the fixed disc Pulse shapers deliver the recovered signals to timing logic which separates the sector and index marks and checks the spindle speed Each sector pulse...

Page 37: ...e proper installation operation and maintenance of DGC equipment and software The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole or in pa...

Page 38: ...direction when the phase signal is low and the average current is zero Current always returns to ground in the same direction through the current sensing resistor so the resulting current sense voltag...

Page 39: ...T4 6K COUNT 4 T9 7K T19K PRESET 2 FIXED PULSES T24K T1 2K T610 T305 T152 OK ENABLE CARTRIDGE PULSES C610 SPEED OK DG 04070 0 CLK 16 0 48lT 8 COUNT 4 o_ PRESET 2 CLK 16 0 4BIT 8 0 COUNT 4 0 PRESET 2 I...

Page 40: ...IGNAL INDEX SECTOR NAMES PULSE PULSE WINDOW WINDOW C610 1 1 1 1 1 1 1 1 0 C1 2 0 0 0 0 1 1 1 1 0 C2 4 0 0 1 1 0 0 1 1 0 C4 8 0 1 0 1 0 1 0 1 0 PRESET FREE E_ The freeze count is always reached during...

Page 41: ...uipment nd software The drawings and specifications cont ined herein re the property of DCC nd shall neither be reproduced in whole or in part without OGC s prim written appro al nor be implied to gra...

Page 42: ...n the coil and the magnet poles and the bearings are spring loaded to prevent lateral head movements A notch in the upper beam aligns with one of the bearings in the retract position to provide a retr...

Page 43: ...e this simply by examining the slope of Sinx because Sinx is negative going as the positioner moves forward through a centerline but positive going as it moves backwards Dsinx and Dcosx combine to dec...

Page 44: ...seH equipment mi1nuf ctured in 1ccord1nce herewith POSITION WAVEFORMS TRACK NUMBERS SIGNAL SIGNAL NAME FUNCTION LOCATION ANALOG TRACK POSITION 872 SINX SIGNAL 2C7 ANALOG TRACK CENTER 872 COSX LOCATOR...

Page 45: ...tput drives a digital to analog converter DAC that provides a voltage proportional to the required velocity An atenuator divides the voltage when the heads move within two tracks of the destination to...

Page 46: ...implied to grant any license to m11ke use or sell equipment nunufactured in 1 ecord1nce herewith H E A D POSITIONER BLOCK DIAGRAM TEMP COMPENSATION VCOMP TRACK ADDRESS SEEKCOM D RECALCOM D SINX DG 040...

Page 47: ...The B ROMs control positioner movements during load unload and recalibrate operations They also control movement during the initial phase of a long seek The B ROMs decode drive states that indicate th...

Page 48: ...nt address For example if the address is 3 the output is 111111100 2 The one bit full adder is internally wired to add one to the sum so the result is a two s complement add If the present address is...

Page 49: ...1 1 0 1 1 969 I 9 69 5412 30 96 80 1 1 0 1 0 0 0 1 1 1 1 0 1 0 1 1 1 828 I 828 46 26 t 60 1 0 1 1 1 1 0 1 1 1 0 1 0 1 0 1 1656 l 6 56 36 66 20 80 40 1 0 1 0 1 0 0 1 1 0 1 1 1 1 1 1 1 484 4 84 27 06 2...

Page 50: ...ndle has come up to speed and the brushes have completed a sweep load It clears when the spindle shuts off unload PA512 Present address bit 512 is the most significant bit of the present track address...

Page 51: ...the current to voltage conversion ratio to get 0 46875 volts as the velocity reference The resulting velocity is 0 873 0 15625 x0 46875 2 62 ips Detent Servo some details The diagram on the opposite p...

Page 52: ...o gr int any licenH to m ke use or seU equipment m1nufactured in ccordAnce herewith DETENTSERVO SINX GAIN ADJ REF REF BAL DG 04082 POSITION ERROR WINDOW _____ DETECTOR 1 f lli f ENABLE DETENT ENABLE L...

Page 53: ...drive amplifier If the average current level exceeds 4 8amps it requests an emergency retract A velocity in excess of 78ips would indicate a failure in the velocity servo and could result in extensive...

Page 54: ...ent m anufactured in ucord1nce herewith EMERGENCY RETRACT SYSTEM SERVO DISABLE SWITCH EMERGENCY RETRACT RELAY t n NO f J NC I I I I I I I NO I I 50MV AMP 005 n CURRENT SENSE FIXED SECTOR DISC SECTOR P...

Page 55: ...SEEK FLOW DIAGRAM NO BROMS DICTATE VELOCITY NO DG 04084 VIII 14 BEGIN SEEK A ROMS DICTATE VELOCITY YES D1t1 General Corporation OG has prep ired this manu1I for use by OGC personnel 1111d customers as...

Page 56: ...C6 RUN MODE 873 1D6 POWER FAULT START SPINDLE MOTOR START BRUSH CYCLE BCEO 873 1 C6 READY LIGHT ON DISK UNIT READY DISK DRIVE IS READY TO EXECUTE DG 04087 1 0 COMMANDS FROM CONTROLLER SEE RECAL LOAD...

Page 57: ...s prior written approval nor be implied lo grant any license to make use or sell equipment manufactured in accordance herewith REJECT SEEK COMMAND NO OPERATION REVERSE VELOCITY MODE BROM VELOCITY CON...

Page 58: ...DE RUN SPINDLE 873 106 _ RNENAB RUNENA8LE 873 1C6 u INDX DATA ZONE 873 2B7 FAR OVERTRAVEL 873 2B7 Rf SET PRESENT PARST ADDRESS AEGISffR 873 287 PA 512 PRESfNT ADORES 873 2D7 00R 512 DACSGN FORWARD 873...

Page 59: ...ned herein are the propnty of DGC and shall neither be reproduced in whole or in part without DGC s prior written appronl nor be implied to gr nt any license to make use or self equipment manufactured...

Page 60: ...of flux so each flux reversal induces a current pulse in the head The read circuits amplify these current pulses to recover the data clock signal A phase locked loop then locks onto theclock pulses wh...

Page 61: ...make a phase adjustment to lock to the clock pulses in the data stream and this reduces the time that the read circuits need to synchronize with the data phase locked loops take time to shi to a new f...

Page 62: ...ome details The diagram to the right shows a selected head in the write configuration The matrix diodes have been omitted for clarity The write flip flop receives 2F encoded data pulses from the contr...

Page 63: ...nal is amplified filtered to reduce the harmonic content amplified again and finally differentiated The result is a waveform that has zero crossings at the corresponding flux transitions This signal i...

Page 64: ...this read signal in frequency and phase and produces a clock Cl that has positive transitions at the bit cell boundaries and negative transitions at the centers An additional clock C2 leads C1 90 deg...

Page 65: ...11nd mainten 11nce of OGC equipment and software The drawings 11nd specifintions cont 11ined herein are the property of OGC 11nd shall neither be reproduced in whole or in p 11rt without DGC s prior...

Page 66: ...is read signal in frequency and phase and produces a clock C1 that has positive transitions at the bit cell boundaries and negative transitions at the centers An additional clock Cl leads C1 90 degree...

Page 67: ...on and maintenance of OGC equipment and software The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole or in part without OGC s prior writte...

Page 68: ...de supply mounted on the power supply pan the main de regulators on the spindle board the power monitors on the servo board and several auxiliary regulators mounted on the spindle servo and read write...

Page 69: ...ith The structure of a constant voltage transformer differs from that of a conventional transformer A magnetic shunt and resonant winding are added to control flux linkage between the primary and seco...

Page 70: ...arator detects differences between the output and reference voltages and adjusts the output to track the reference To illustrate the operating principle let us examine the responce to a transient outp...

Page 71: ...tional regulators that supply write and erase current power the position sensor lamp and provide precision references for level sensing circuits They are all shunt regulators of different phase The si...

Page 72: ...APPENDICES...

Page 73: ...ng the drive from the cabinet Set to LOAD to stop the disc drive and to unlock the drive to slide out of the cabinet and thereby permit a cartridge disc to be loaded This switch should be in the LOAD...

Page 74: ...d storage to ensure the integrity of the data stored within it Use the handle on top of the cartridge when transporting the disc and always install the dust cover on the cartridge as soon as it is rem...

Page 75: ...ive as shown The cartridge will fit into locating lugs when properly positioned and slide smoothly into the cavity and seat on the spindle 9 Lower the cartridge handle until it is flat on the cartridg...

Page 76: ...ht does not illuminate after one minute turn the LOAD READY switch to LOAD wait for the LOAD light to illuminate and then turn the LOAD READY switch to READY again If the READY light remains extinguis...

Page 77: ...ds or other foreign objects do not touch the disc surface Do not attempt to blow foreign material from a disc as moisture contamination may result If a disc cartridge is suspected of damage do not use...

Page 78: ...drive is equipped with filters to remove air borne contaminants but excessive smoke or dust will reduce filter life The computer room should be maintained as clean as possible It is very poor practic...

Page 79: ...000258 SCHEMATIC DISC CARTRIDGE CONTROL ILLUSTRATED PARTS LISTS 016 000260 IPL READ WRITE PCB 016 000265 IPL SERVO SERVO POWER SUPPLY MONITOR PCB 016 000266 IPL LOGIC CONTROL PCB 016 000259 IPL DISC...

Page 80: ...and software The drawings ind specifications contained herein are the property of OGC and shall neither be reproduced in whole or in p rt without DGC s prior written 1pproul nor be implied lo grant 1...

Page 81: ...pictorial representations that may help you isolate problems to the board level The five boards are Logic control Servo control and power monitor Ibwer supply and spindle drive Read write Temperature...

Page 82: ...t data transfers An additional monitor watches for positioner movements across the data zone boundaries and controls load unload and recalibrate operations The read write control section decodes the h...

Page 83: ...ner It also includes the monitors for the main de supply voltages and additional regulators to power the servo circuits and the lamp in the position sensor The servo circuits include the velocity and...

Page 84: ...ll the analog read write circuits including the head selector write driver read preamplifier and peak detector and fault detection logic TEMPERATURE COMPENSATION The temperature compensation board con...

Page 85: ...shill neither be reproduced in whole or in p1 rt without DGC s prior written 1pprov1I nor be implied to gr1nt 1ny license to m ke use or sell equipment nuinuf1etured in accord1 nce herewith DRIVE INT...

Page 86: ...ND 47 sv 48 060 46 DS 31 HDl 19 29 H02 21 25 READ GATE 25 24 READ CLOCK 1 6 READ DATA 2 1 WRITE DATA 29 l 18 ___ _ S EC T O R P ULS E 16 SAl 36 13 SA2 37 14 SA4 38 1 SAS 43 8 A l Tm 10 TAl 42 f7 TA2 3...

Page 87: ...OMPLETE A SEEK OPERATION WITHIN 267 MSEC A COUNT ERROR OR AUTOMATIC RECALIBRATE SEEK OVERTRAVEL OCCURRED THE DISC SPEED FELL BELOW 2000 RPM WHILE THE HEADS WERE LOADED THE POSITIONER VELOCITY EXCEEDED...

Page 88: ...carry i e exclusive or arithmetic 110111 10011 I1100100000 10011 10100 10011 01110 00000 11100 10011 11110 10011 11010 10011 _ most significant bit of partial remainder is 0 so shift the remainder un...

Page 89: ...uit To understand how diffraction works we will first examine a one dimensional grating Think of a diffraction grating as an array of slits somewhat liike a pickett fence The width and spacing of the...

Page 90: ...not find things easily 0 Other 0 Language is is not appropriate 0 Technical terms are are not defined as needed O Learning to use the equipment 0 As a reference O As an introduction to the product 0 V...

Page 91: ......

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