Shugart SA1000, Manual

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Page 2: ...lection 7 3 5 Read Operation 7 3 6 Write Operation 8 4 0 Electrical Interface J 8 4 1 Signal Interface 8 4 1 1 Control Input Lines 10 4 1 1 1 DriveSelect1 4 10 4 1 1 2 Direction In 10 4 1 1 3 Step 11 4 1 1 4 Head Select 2 and 21 12 4 1 1 5 Write Gate 12 4 1 1 6 Reduced Write Current 12 4 1 2 Control Output Lines 13 4 1 2 1 Track 000 13 4 1 2 2 Index 13 4 1 2 3 Ready 13 4 1 2 4 Write Fault 14 4 1 2...

Page 3: ...l Step Mo de 11 6 Buffered Step Mode 11 7 Head Selection Timing 12 8 Control Output Driver Receiver Combination 13 9 Index Timing 13 10 Data Transfer Line Driver Receiver Combination 14 11 J2 Interface Connection 15 12 MFM Read Write Data Timing 15 13 General Control Timing Requirement 16 14 Connector Locations 19 15 J1 Connector Dimensions 20 16 J2 Connector Dimensions 20 17 J4 Connector 21 18 J5...

Page 4: ...m enclosure A self contained recirculatin g system supplies clean air through a 0 3 micron filter Another absolute filter allows pressure equalization with ambient air The optional SA1200 Data Separator PCB or equivalent circuitry is necessary to provide MFM en coding decoding write precompensation a crystal write oscillator and address mark writing and detection These functions are also provided ...

Page 5: ...ady state non stepping 5VDC 5 2 OA typical during stepping 3 6A typical non stepping 5VDC 5 7 to 16VDC optional 0 2A typical Mechanical Dimensions Height Width Depth Weight Rack Mount 4 62 in 117 3mm 8 55 in 217 2mm 14 25 in 362 0mm Standard Mount 4 62 in 117 3mm 9 50 in 241 3mm 14 25 in 362 0mm 17 Ibs 7 7Kg 17 Ibs 7 7Kg Heat Dissipation 150 Watts 511 STU Hr Max 1 2 2 Reliability Specifications MT...

Page 6: ... Kbytes 8 2 Kbytes Per Sector 256 bytes 256 bytes SectorslTrack 32 32 Transfer Rate 4 34 Mbits sec 4 34 Mbits sec Access Time Track to Track 19 msec 19 msec Average 70 msec 70 msec Maximum 150 msec 150 msec Average Latency 9 6 msec 9 6 msec 1 2 4 Functional Specifications Rotational Speed 3125 rpm 3125 rpm Recording Density 6270 bpi 6270 bpi Flux Density 6270 fci 6270 fci Track Density 172 tpi 172...

Page 7: ...ead and Write data 4 Provide a contamination free environment Class 100 or better 2 2 READ WRITE AND CONTROL ELECTRONICS The standard electronics are packaged on a single printed circuit board containing the following circuits 1 Index Detector Ci rcuit 2 Head Position Actuator Drivers 3 Read Write Amplifiers 4 Drive Ready up to Speed Circuit 5 Drive Select Circuit 6 Write Fault Detection Circuit 7...

Page 8: ...d by the Fasflex IIITM actuator A stepper motor is used to precisely position the carriage assembly utilizing a unique metal band capstan concept 2 6 Read Write Heads and Disk s The recording media consists of a lubricated thin magnetic oxide coating on a 200mm diameter aluminum substrate This coating formulation together with the low load force low mass Winchester type flying heads permit reliabl...

Page 9: ...Figure 2 Positioning Mechanism 6 Stepper Motor Ball Bearing Carriage Support ...

Page 10: ...condition with SEEK COMPLETE true d Selecting the appropriate Direction e Pulsing the Step Line Stepping can occur at either the Normal or Buffered rate During Normal Stepping the heads are reposition ed at the rate of incoming step pulses In the case of Buffered Stepping incoming step pulses are received at a high rate and are buffered into counters When all of the steps have been received they a...

Page 11: ...of three categories 1 Control Input lines 2 Control Output lines 3 Data Transfer lines All control lines are digital in nature and either provide signals to the drive input or provide signals to the disk controller output via the interface connector J1 P1 The data transfer signals are differential in nature they provide data and clocking either to or from the drive via J2 P2 NOTE Refer to Figure 3...

Page 12: ...IR DRIVE SELECT 2 29 28 20 FT MAX DRIVE SELECT 3 31 30 DRIVE SELECT 4 33 32 DIRECTION IN 35 34 STEP 37 36 NA 39 38 WRITE GATE 41 40 TRACK 000 43 42 WRITE FAULT 45 44 NA 47 46 NA 49 48 NA 50 5V DC 6 LOGIC GROUND 5 51P5 5VDC 7V to 16VDC OPT 3 4 TWISTED PAJR LOGIC 24V DC SINGLE GROUND 1 WIRE 2 STRAP ACINPUT 1 FRAME GROUND 2 AC MOTOR GROUND FRAME GROUND ACINPUT 3 J4 P4 DISK CONTROLLER SA1000 DRIVE Fig...

Page 13: ...daisy chained together with SA1000 drives A SA1000 should be physically located at the end of the cable and terminated at IC location BC A 220 3300 resistor pack located at IC location 8C provides input line termination 4 1 1 1 DRIVE SELECT 1 4 DRIVE SELECT when logically true connects the drive to the control lines Only one DRIVE SELECT line may be active at a time Jumper options DS1 DS2 DS3 and ...

Page 14: ...nders and SEEK COMPLETE Refer to Section 4 1 2 5 will go true after the read write heads set tle on the cylinder This mode of operation is automatically selected when the time between step pulses is the less than 200j tsec 100 ns after the last step pulse has been sent to the drive the DRIVE SELECT line may be dropped and a different drive selected The maximum time between steps is 200j ts with a ...

Page 15: ...state of this signal logical zero level enables WRITE DATA to be written onto the disk The inac tive state of this Signal logical one level enables data to be transferred from the drive and enables STEP pulses to reposition the head arm HEADS SWITCHED READ DATA VALID j 20l s MAX ____ I I 201 S MAX I E 460ns t7Ax 8 CONTROLLER L __________ Figure 7 Head Selection Timing A 220 330n resistor pack loca...

Page 16: ...ck and the access circuitry is driving current through phase one of the stepper motor This signal is false logical one when the selected drive s read write head is not at track zero 4 1 2 2 INDEX The drive provides this interface signal once each revolution 19 2ms to indicate the beginning of the track Normally this signal is a logical one and makes the transition to logical zero for a period of a...

Page 17: ... COMPLETE is true SEEK COMPLETE will go false in two cases A recalibration sequence is initiated by the drive logic at power on if the read write heads are not over track zero 500 NS typical after the leading edge of a STEP pulse or the first of a series of step pulses 4 1 3 DATA TRANSFER LINES All lines associated with the transfer of data between the drive and the host are differential in nature...

Page 18: ... an inactive state MFM WRITE DATA more negative than MFM WRITE DATA by the host system when in the read mode Figure 12 shows the timing for MFM WRITE DATA 4 1 3 2 MFM READ DATA The data recovered by reading a pre recorded track is transmitted to the host system via the differential pair of MFM READ DATA lines This transition of the MFM READ DATA line going more positive than MFM READ DATA line rep...

Page 19: ...TTL open collector driven as shown in Figure 8 This signal will go active only when the drive is programmed as drive X X 1 2 3 and 4 by proper placement of the shorting plug in the vicintiy of J1 and that DRIVE SELECT X line at J1 P1 is activated by the host system AC POWER ON 1 DC POWER ON J H5SEC TYP DISK 95 SPEED _ ___ READY J 1ms TYP 1 TKOOO _____________________________ J I 5 1 SEC MAX SEEK C...

Page 20: ...to speed 4 2 POWER INTERFACE The SA1000 requires both AC and DC power for operation The AC power is used for the drive motor and the DC power is used for the electronics and the stepper motor 4 2 1 AC POWER The AC power is via the connector J4 mounted at the center rear of the drive Table 2 shows a listing of the AC power requirements 4 2 2 DC POWER DC power to the_drive is via connector J5 P5 loc...

Page 21: ...INRUSH 2 6A CURRENT 3 SEC 1 1 1 25A 2 6A 1 2A MAX RUN CURRENT 1 0A 0 5A 1 1A 0 6A FREO TOl 0 5 HZ 0 5 HZ Table 2 AC Power Requirements CURRENT P5 STEADY STATE STEPPING CONNECTOR MAX TYP MAX TYP 24 2 4V 1V P P MAX O 25A O 20A 3 3A 2 8A Ripple 5 O 25V 50mV P P 4 1A 3 6A 2 5A 2 0A MAX Ripple 7 TO 16V OPT 5 O 25V 50mV P P O 25A O 20A O 25A O 20A MAX Ripple Table 3 DC Requirements 18 ...

Page 22: ... connector J1 provides control signals for the drive the second connector J2 provides for the radial connection of the read write signals the third connector J5 provides DC power and the fourth connector J4 provides AC power and frame ground Refer to Figure 14 for the connector locations Figure 14 Connector Locations 19 ...

Page 23: ...or PIN 3415 0001 j 036 004 2 r t T 400 010 450r 010 11 j f 050 NOM 050 NOM 100NOM I 2 575 010 BOARD THICKNESS 062 007 50 I I I I j f 06 I Figure 15 J1 Connector Dimensions 5 2 J2 P2 CONNECTOR NOM Connection to J2 is through a 20 pin PCB edge connector The pins are numbered 1 through 20 with the even numbered pins located on the component side of the PCB The recommended mating connector for P2 is a...

Page 24: ...ecommended mating connector P4 is AMP socket PIN 1 480700 0 with AMP pins PIN 350536 1 Figure 17 J4 Connector 5 4 J5 P5 CONNECTOR The DC power connector J5 is a 6 pin AMP Mate N Lok connector PIN 1 380999 0 mounted on the non component side of the Control PCB The recommended mating connector P5 is an AMP PIN 1 480270 0 utilizing AMP pins PIN 60619 1 The J5 pins are labeled on the connector Refer t...

Page 25: ...own in figures 19 20 must be installed whenever drive is being transported Damage to the magnetic heads disks or both may occur if spindle is not locked during ship ment 1r iT FRONT COVER OUTLINE 8 32 UNC 2B J UNTING HOLES 12 pis 0 0 00 0 t t 0 9 I 2 42 208 t 80 1 8 00 NEW STYLE DRIVE MOTOR PULLEY DRIVE MOTOR LOCK 3 00 DIA THIS AREA TO BE LEFT OPEN FOR ACCESS TO LOCK 25 14 _ _ _ 14 00 4 100 II 3 5...

Page 26: ...I 1 aa I DRIVE MOTOR PULLEY NEW STYLE DRIVE MOTOR LOCK 3 0 0 DIA THIS AREA TO BE LEFT OPEN FOR ACCESS TO SPINDLE LOCK 251 4 14 0 0 1 0 0 I 4 I 3 5Q t OLD STYLE DRIVE MOTOR LOCK 9l_t l DIATHRU DRIVE MOTOR PULLEY Figure 20 Standard Mount Physical Dimensions 23 T 9 14 ...

Page 27: ... to zero Errors cari be classified into soft or hard errors Soft errors are generally related to signal to noise ratio of the system If an error is repeatable with a high probability it is due to media defect ahd is termed a hard error How Will Shugart Find the Errors The errors will be identified prior to shipment and information incorporated in a usable format to enable the user to skip those de...

Page 28: ...ter used for data verification Each CRC polynomial is unique for a particular data pattern Surrounding The 1 0 and data field are gaps called Interrecord gaps 8 1 GAP LENGTH CALCULATIONS 8 1 1 GAP 1 Gap 1 s purpose is to provide a head switching recovery period so that when switching from one track to another sequential sectors may be read without waiting the rotational latency time Gap 1 should b...

Page 29: ...um amount of pre compensation for the SA1000 is 12 nanoseconds for both early and late written bits TABLE 4 shows various bit patterns for pre compensation WRITE POSITION DIRECTION OF SHIFT o 0 0 0 On Time Clock o 0 0 1 Late Clock o 0 1 0 On Time Data o 0 1 1 Early Data o 1 o 0 o 1 o 1 o 1 1 0 Late Data o 1 1 1 On Time Data 100 0 Early Clock 1 o 0 1 On Time Clock 1 0 1 0 On Time Data 1 o 1 1 Early...

Page 30: ...s option enables an active ready signal at the interface Drive Select When jumpered this option selects the designated drive 081 4 5 15 Volts When jumpered in the 5 volt configuration this option bypasses the regulator chip to be used when the input voltage is rated at 5 volts When jumpered in the 15 volt con figuration this option allows a 15 volt input to be regulated to 5 volts FAULT READY J 5 ...

Page 31: ...4 must be removed before applying AC power to the drive reference the figure below Retain the lock for reinstallation prior to transporting the drive 2 To prevent possible damage to the heads and media rotate the spindle in a clockwise direction only 3 To isolate the AC ground from logic ground remove the motor ground strap PIN 60060 Figure 23 SA1000 Packaging 28 ...

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