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Содержание FloppyTape 525 Series

Страница 1: ...Series 525 FloppyTapeTM Cartridge Tape Drive Product Description...

Страница 2: ...able Read Errors 2 3 Non Recoverable Read Errors 2 3 Power Loss 2 3 FUNCTIONAL CHARACTERISTICS 3 1 General Description 3 1 Read Write Control Electronics 3 1 Tape Drive Mechanism 3 3 Read Write Head P...

Страница 3: ...NVIRONMENTAL CHARACTERISTICS POWER REQUIREMENTS 8 1 Temperature 8 1 Humidity 8 1 Altitude 8 1 Vibration 8 1 Shock 8 1 Air Quality 8 1 Acoustical Noise 8 2 DC Power 8 2 Heat Dissipation 8 2 Cooling 8 2...

Страница 4: ...Tables A I Service Aids A 4 Continuous Forward Reverse A 4 Stream Positioning All Streams A 4 Stream Positioning Streams 0 4 A 4 Cyclic Tape Motion A 4 APPENDIX B OPERATING PARAMETER CONSIDERATIONS B...

Страница 5: ...g 4 6 525 Drive Interface 525 Drive Interface SA4 50 SA850 I O Listing Interface Signal Driver Receiver Read Data Signal FM MFM Write Data Signal FM MFM 525 Interface Connectors SA450 J 1 Interface Co...

Страница 6: ...1 525 FloppyTape Drive o Sector smallest unit of addressable memory located within a segment o Segment a fixed length of tape that emulates a floppy disk track Each segment is 26 55 inches and has the...

Страница 7: ...at 6400 BPI I 11M I 1 SEGMENT 20 5 K BYTES I 4 11M ISEGMENT 111M ISEGMENT 211M ISEGMENT I ISEGMENT 255 256 Segments become a Stream STREAM 1 0 0 0 STREAM 2 0 STREAM 3 STREAM 4 STREAM 5 0 0 STREAM 6 o...

Страница 8: ...tes Emulation of a floppy disk track is achieved by partitioning a stream into 26 inch segments Segments are separated by DC saturated portions of tape referred to as Index Marks OMs Stream partitioni...

Страница 9: ......

Страница 10: ...ding Times 78 ips 500 Kbits sec 39 ips 250 Kbits sec 2 1 2 Positioning Method Transfer rate is tape drive dependent 2 1 78 ips SOD Kbits sec or 39 ips 2S0 Kbits sec 350 ms Less than 2 Less than 6 200...

Страница 11: ...MTBF calculations The sample size must be greater than 100 units for the purpose of MTBF calculation Production and design maturity improvements allow the MTBF rate to be achieved 18 months from start...

Страница 12: ...ndled the cartridge can be used for at least 5 000 full length passes BOT to EOT and back to BOT is considered 2 passes 2 3 2 Recoverable Read Errors A recoverable error soft error is one which may be...

Страница 13: ......

Страница 14: ...both directions by a direct drive DC capstan motor The built in tachometer circuit provides feedback to the control electronics for constant motor speed adjustment A photo detector senses the Beginnin...

Страница 15: ...CTION TRKtl INDEX MOTOR ON READY DS1 DS2 DS3 SEL DS4 _ SIS READ AMP WRITE LOGIC CONTROL LOGIC INDEX DETECT f ENABLE MTR DRV 4 DIRECTION HI SPEED LTH UTH HEAD R 3 I EOT BOT 1 SENSOR I I I I I I I I I n...

Страница 16: ...This configuration assures exact media positioning A sliding contact pin opens the tape cartridge door to enable contact between the media and Read Write head 3 4 READ WRITE HEAD POSITIONING MECHANIS...

Страница 17: ......

Страница 18: ...Through the use of three jumpers W1 W2 W3 a total of seven possible stream configurations can be derived See Stream Selection Tables Appendix A When a new stream is selected and the Head Load or Motor...

Страница 19: ...to avoid excessive wear of the medium 4 4 SEGMENT ACCESSING Segment accessing requires the host controller to perform the following steps a Select the desired stream b Activate the Head Load Motor On...

Страница 20: ...SELECT DESIRED STREAM ACTIVATE HEAD LOAD I MOTOR ON READ ADDRESS MARK FROM TAPE SET DIRECTION LINE ISSUE STEP PULSE YES HOST CONTINUES OPERATION Figure 4 3 Stream Access Flowchart 4 3...

Страница 21: ...On moves the tape upstream to the next segment See Figure 4 4 NOTE DC POWER JI I DRIVE SIDE SELECT I X VALID STREAM SELECTION HEAD LOAD MOTOR ON INDEX STEP DIRECTION READ DATA I 1 160 SEC MAX AUTO RE...

Страница 22: ...is measured at the host 2 If no Step pulse is received the 525 will not issue the second Index pulse until the unit completes repositioning on the same segment Figure 4 5 Read Timing 4 7 WRITE OPERAT...

Страница 23: ...lllll NOTES 1 Timing is measured at the host 2 H no Step pulse is received the 525 will not issue the second Index pulse until the unit completes repositioning on the same segment Figure 4 6 Write Ti...

Страница 24: ...GND nn rl ACGND X X g FLAT RIBBON OR TWISTED PAIR MAX 10 FEET READY DRIVE SELECT 4 INDEX DRIVE SELECT 1 DRIVE SELECT 2 DRIVE SELECT 3 MOTOR ON DIRECTION SELECT STEP WRITE DATA WRITE GATE TRACK WRITE P...

Страница 25: ...E SELECT 3 DRIVE SELECT 4 01 RECnON SE LECT STEP WRITE DATA WRITE GATE TRACKH WRITE PROTECT READ DATA 5 VDC 5 RETURN 12VDC 12 RETURN TWISTED PAIR NOTE ALL ODD NUMBERED PINS ARE GROUND 14 18 20 22 26 2...

Страница 26: ...on Stream selection with Side Select Stream selection with Side Select Stream selection with Side Select Stream selection with Side Select Stream selection When low true in conjunction with Step pulse...

Страница 27: ...ix logical drives When a particular drive is selected the head moves to the appropriate stream and the microprocessor is enabled to scan and respond to other control signals Head Load Motor On When th...

Страница 28: ...e Read amplifier section so data may be read 5 4 OUTPUT CONTROL SIGNALS Track 00 A logic low level on the Track line TROO indicates the 525 is at or going to the first segment 00 of the selected strea...

Страница 29: ...ition detected on the tape F M Recording READ DATA FM c I D C Clock Pulse 300 100 ns Bit Cell Time 4 IJs MF M Recording c I c I D 21 S L NOM I I C D Data Pulse 300 50 ns Figure 5 5 Read Data Signal FM...

Страница 30: ...the Write current direction through the Read Write head The Write Data line is enabled by the Write Gate control line FM Recording C Clock Pulse 150 ns min 1 JlS max o Data Pulse 150 ns min 1 JJS max...

Страница 31: ......

Страница 32: ...erface unit and a 34 pin connector on the SA450 interface drive 32 is a 4 pin connector used to supply DC power J2 J1 2 6 II II1111111111111 4 Figure 6 1 525 Interface Connectors SA450 6 2 SIGNAL CONN...

Страница 33: ...35 with Viking IIIJN 5 solder lugs 3M 113415 001 The mating DC connector is a 4 pin AMP MATE N LOCK AMP PIN 1 480424 0 with AMP pins PIN 61473 2 Minimum conductor size for interconnect wires is 18 AWG...

Страница 34: ...PCB board should be on the right side while viewing the unit from the front CAUTION Do not mount the 525 upright cartridge slot facing up Four base holes and two holes on each side are provided for m...

Страница 35: ......

Страница 36: ...erature 260 max non condensing Sea level to 10 000 ft 3 000 m Same as Operational Sea level to 49 000 ft 15 000 m The unit shall withstand a peak acceleration of 0 3g for the frequency range of 5 500...

Страница 37: ...12V 5 1 8A nominal 2 5A surge max during cartridge acceleration 350 ms duration 100 mV max ripple peak to peak Source Impedance 50 milliohms max 9 HEAT DISSIPATION 25 6 Watts operational 87 BTU hr 35...

Страница 38: ...plied is based on formatter designs utilizing controller chips as outlined in Appendix B HOST CPU A 0 0 0 A R T E A 5 5 B U B 5 U 5 ADDRESS DATA ADDRESS DATA ADDRESS DATA ADDRESS DATA ADDRESS WINCHEST...

Страница 39: ...ple of a controller interface schematic for the 525 HOST INTERFACE I I I I ADDRESS CONTROL BUS CONTROLLER SELECT LOGIC IMPLEMENTED IN FLOPPY DISK CONTROLLER COMMAND PROCESSOR COMMAND DATA C 0 N T R 0...

Страница 40: ...DATA BUS 5 dA 16 HEAD LOAD 5V MOTOR ON LS245 1 ____ 8 t RPW _e__ 7 DALO 8 9 10 11 12 13 14 1 2 3 4 5 6 HLD 28 10 LS123 _ 5 H HLT Kr C _ 9 m kt 5V 17 7 5 111 WRITE PRECOMP rl ENABLE JUMPERS 31 L OO EN...

Страница 41: ...e next bit cell The bit cell time for single density is four microseconds The pulse width for a one bit either clock or data is 300 ns See Figure 9 4 9 3 2 Double Density MFM Modified Frequency Modula...

Страница 42: ...to recalibrate to Segment IJ J Another way to accom plish the same result is to format all six streams prior to the start of the verification pass 9 4 5 I O Buffering Sector Interleaving Multiple sect...

Страница 43: ...to ensure proper operation Failure to do so may result in data error rates that are unacceptable The 525 performs this function automaticaUy when a tape is loaded into the device The pass lasts for ap...

Страница 44: ...BM format OF Data Field 256 or 512 or 1 024 bytes OL Overhead Length 62 bytes IBM format IGL Inter record Gap Length G3 54 bytes for 256 512 byte Data Fields 84 bytes for 1 024 byte Data Fields Sector...

Страница 45: ...0 I 12 50 I 12 I oca oc aS c FE 1 0 0 0 0 1 z Ii 0 0 0 GAP EI ti CAC Z c z SG ST SC NO 1 NO NO 1 CLIICRCI 4E 03 02 01 2 2 2 22 22 22 u z uc 0 00 12 12 12 5 c Ii A1 3 3 3 c a Il as c FB 1 1 J I I J USE...

Страница 46: ...Run a verification pass against each formatted stream to test for dropout events which result in CRC errors Any sector with CRC errors should be flagged in the Volume Table Of Contents VTOC to indica...

Страница 47: ...IRED STREAM ISSUE RECAUBRATE COMMAND SEGMENT IMAGE EXECUTE WRITE SEGMENT COMMAND ISSUE STEP PULSE INCREMENT SEGMENT IMAGE Figure 9 6 Format Flowchart FORMAT COMPLETE Figure 9 7 Verification Pass Flowc...

Страница 48: ...WRT GATE 125 Js T4 T 6 WRTGATEtoWRTDATA 4 ls T3 T5 INDEX Width 1 7 ms min T3 T7 Segment Boundaries 327 ms min T 7 T 8 INDEX to WRT GATE O T7 T9 INDEX to DIRe O T9 T 10 DIRe to STEP 1 Js T 10 T 11 STEP...

Страница 49: ...c z TrA clC l 9 6 2 Segment To Segment Access time from a segment to a contiguous segment is 344 ms Index Mark to Index Mark Access time from a segment to a non contiguous segment is calculated by det...

Страница 50: ...X T3 T4 400 ms min T5 525 de asserts INDX T4 T 5 1 7 ms min T6 525 begins to supply raw data T4 T6 2 Js T7 Host sets DIRC line in preparation for a Step In command T5 T7 338 ms T8 Host sets STEP line...

Страница 51: ...keep the 525 streaming the host must send a STP pulse within T1 T3 344 ms No Step pulse sent by host 525 drive motor begins to ramp down T2 T3 6 ms Tape motion halts T3 T4 300 ms Tape motion starts i...

Страница 52: ...host generated signal to light front panel LED to indicate drive in use W9 Service aids configuration jumper W10 Service aids configuration jumper A 2 STREAM SELECTION TABLES Stream Selection is prov...

Страница 53: ...t Using DS2 DS4 And Side Select Wl In W2 Out W3 In Yields DSI DS2 DS3 DS4 Side Select H L H H H Stream 1 H L H H L Stream 2 H H L H H Stream 3 H H L H L Stream 4 H H H L H Stream 5 H H H L L Stream 6...

Страница 54: ...ry Select Using OS2 DS3 And Side Select Wl Out W2 In W3 Out Yields OSl OS2 OS3 OS4 Side Select H L H H H Stream 1 H L H H L Stream 2 H H L H H Stream 3 H H L H L Stream 4 H L L H H Stream 5 H L L H L...

Страница 55: ...he function is terminated by removing the jumper and the cartridge A 3 3 Stream Positioning Stream 0 4 With jumper WID installed inserting a cartridge starts the routine outlined in Paragraph A 3 2 Sd...

Страница 56: ...lec t this parameter The second type of time outs are those internal to a specific floppy disk controller chip These time outs are either specified as part of commands WD or as part of a Specify Comma...

Страница 57: ...standard sector sizes used for floppy disks The Sectors Segment column reflects the maximum number of sectors that may be recorded reliably within a segment The Segments Stream columns state the maxim...

Страница 58: ...14 833 8751 TWX 910 333 0915 1737 North First Street Suite 505 San Jose CA 95112 Telephone 408 298 6252 TWX 910 333 0908 2659 Townsgate Road Suite 101 Westlake Village CA 91361 Telephone 805 495 8844...

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