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TrueTime VME-SG2 560-5608 Manual

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TrueTime VME-SG2 560-5608 Manual

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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 Model 560-5608 VME-SG2 SERIAL NUMBER_______________ Revision A January 8, 1999 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION PARAGRAPH TITLE GENERAL INFORMATION Scope of Manual Purpose of Equipment Physical Description Environmental Specifications Power Requirements Signal Specifications 1.6.1 General To All Modes A. VME Bus B. Interrupts C. Time Compare Outputs D. External Freeze Event Input E.
  • Page 4 TABLE OF CONTENTS (Continued) SECTION PARAGRAPH TITLE INSTALLATION AND OPERATION 2.4.1 Generator 2.4.2 GPS Synchronized Generator 2.4.3 Code Synchronized Generator 2.4.4 Front Panel Indicators And Display 2.4.5 Oscillator Discipline 2.4.6 Reading Time 2.4.7 Reading Position 2.4.8 Loading Position 2.4.9 Operational Configuration And Status Registers 2.4.10 VME Interrupt Control 2.4.11...

  • Page 5: General Information

    GENERAL INFORMATION SCOPE OF MANUAL This manual contains the information necessary to operate and maintain the TrueTime VME Timing Cards. Multiple configurations are described. This VME product line consists of the VME Timing board which by itself is referred to as the VME-SG. When a GPS Engine is added to the basic VME Timing board assembly the product becomes known as the GPS-VME.

  • Page 6: Physical Description

    Two Time Compare register sets are available that are preset with time values from hundreds of days through microseconds via the VME bus. When either compare time is equal to the generator time an output pulse is generated. Four independently programmable interrupts are available each with software selectable priority.
  • Page 7 Programmed Rate Generator Programmed Compare Time #1 Programmed Compare Time #2 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 8: Time Compare Outputs

    Time Compare Outputs Outputs a pulse at the programmed compare time #1. Outputs a pulse at the programmed compare time #2. Asserts the Interval level during the interval between compare time #1 and compare time #2. Resolution 1 microsecond Pulse Width 2 milliseconds Compare Mask milliseconds through hundreds of days...

  • Page 9: Pulse Rate

    Pulse Rate Frequencies 1PPS Duty Cyle Amplitude 0vdc to +5vdc @ +/- 6ma Timing Positive going edge on time See section 1.6.4 for P2/J2 pin assignment. IRIG B DC Time Code Output (TTL) Amplitude 0vdc to +5vdc @ +/- 6ma See section 1.6.4 for P2/J2 pin assignment.

  • Page 10: Gps Reference

    1.6.3 SYNCHRONIZED GENERATOR SPECIFICATIONS General Specifications Indicator Power LEDs 1 PPS Phase Locked Input Code Error GPS Reference Phase Less than 1 microsecond to UTC, Accuracy typically less than 500 nanoseconds Osc. Freq. Better than 1 E -7, typically 5 E -8 Discipline Phase 100 nanosecond after PHASE LOCK...

  • Page 11: Reference Code Input, Dc (Rs-422)

    Phase 100 nanosecond after PHASE LOCK Correction Step Size Phase + 1 millisecond in 1 microsecond steps Compensation The Time Code signal may be input at the front panel BNC or on the P2/J2 connector. See section 1.6.4 for P2/J2 the pin assignment. Reference Code Input, DC Shift (RS-422) Format IRIG B122...

  • Page 12: I/O Connector Specifications

    1.6.4 I/O CONNECTOR SPECIFICATIONS 1. VME P2/J2 Connector PIN # ASSIGNMENT PIN # ASSIGNMENT 1PPS OUT RATE PULSE OUT CODE INPUT (AM) TIME COMP #1 OUT TIME COMP #2 OUT INTERVAL OUT EXT EVENT INPUT EXTERNAL OSC INPUT GEN CODE OUT DC (TTL) GEN CODE OUT AM GEN CODE OUT (RS-422)+ GEN CODE OUT (RS-422)-...
  • Page 13 1.6.5 JUMPER SPECIFICATIONS RS-422 Install jumper between JP1-2 and JP1-3 Term Res to enable termination (ON). Install (120 ohms) jumper between JP1-1 and JP1-2 to disable (OFF). GPS battery Install jumper between JP2-2 and JP2-3 backup to connect battery (ON). Install jumper between JP2-1 and JP2-2 to disable (OFF).

  • Page 14: Installation And Operation

    SECTION TWO INSTALLATION AND OPERATION INTRODUCTION This section contains installation instructions and operating procedures for the VME-SG-GPS. As stated in section one there are two configurations of this product. The timing processor board alone is referred to as the VME-SG 2. When the GPS Engine is installed the board is referred to as the GPS-VME.
  • Page 15 (Example 1) OFFSET ADDRESS XX3ABB 0=ON, 1=OFF Black= Switch Position Binary 00111010 Reversed Order 01011100 (Example 2) FACTORY DEFAULT OFFSET ADDRESS XXOOBB Binary 00000000 Reversed Order 00000000 (Example 3) OFFSET ADDRESS XX55BB Binary 01010101 Reversed Order 10101010 Backplane Jumpers: The VME-SG-GPS has interrupt capability and the /IACKIN and the /IACKOUT signal lines are passed in and out of the board.

  • Page 16: Operation, General Information

    OPERATION, GENERAL INFORMATION This section describes operating procedures for the standard VME-SG-GPS. This manual describes some options that may not be present in the users particular card configuration. Section 2.5 provides programming examples to further illustrate the operational capabilities of the VME-SG-GPS.

  • Page 17: Operation, Detailed Information

    A battery is provided on the board to supply power to the GPS Engine when the main power is off. The battery power drives RAM memory and a real time clock located on the GPS Engine card. The RAM is used to store position and almanac information. If this information is not available at power up the GPS Engine will perform a cold start and enter a Search The Sky mode to locate satellites.

  • Page 18: Front Panel Indicators And Display

    When time from the GPS Engine is valid the front panel LOCK LED will blink slowly (2 second rate) until the phase errors are less than 10 microseconds. At that time the LOCK LED will blink faster (twice per second) until the generator is phase locked to < 1 microsecond and the oscillator frequency has stabilized.

  • Page 19: Oscillator Discipline

    2.4.5 OSCILLATOR DISCIPLINE The VME-SG-GPS will discipline the VCTCXO by driving a control voltage to the oscillator so that its frequency relative to the time reference is as small as possible. The accumulative phase error generated due to the frequency error of the oscillator is used to drive the voltage control circuitry.

  • Page 20: Reading Position

    2.4.7 READING POSITION When in the GPS synchronized generator mode position information is generated by the GPS Engine. Position consists of latitude and longitude in degrees, minutes, seconds with North/South/East/West indicators and elevation in meters above or below sea level. The position information actually defines the location of the antenna.

  • Page 21: Operational Configuration And Status Registers

    The position data is written to the position registers in the same format described above. When this is completed the Position Load Request bit in configuration register #2, bit 5 is set. This causes the position data and current time to be formatted and transferred to the GPS Engine.
  • Page 22 Generator Mode - In this mode the VME-SG-GPS card operates as a simple generator that increments time using the internal or external time base. Some generator controls available are start and stop, external start via an external pulse and time preset. GPS SYNC-GEN - In this mode the VME-SG-GPS card will use the GPS Engine to determine time and position.

  • Page 23: Vme Interrupt Control

    Interrupt Enable - Each interrupt has an associated latch that is set when its interrupt source occurs but only if the Interrupt Enable (bit 7) is set. Since spurious interrupt sources could occur during initialization and setup this bit initializes in the cleared (disabled) state. This will guarantee that only interrupts sources that occur after the bit has been set will drive the VME interrupt logic.
  • Page 24 Position Load - this bit (5) is used in conjunction with the Position Output Disable bit described above. It generates a request to the VME-SG-GPS to transfer the position information loaded by the user into the GPS Engine. Negate Interval - Set bit 6 to clear the Interval output signal. This bit may be set at any time the user wishes to guarantee that the Interval output is negated or to abort a time coincidence operation when already in the interval period.
  • Page 25 DYNAMIC - The Dynamic mode is used when the unit is moving at velocities up to 1000 knots. The GPS Receiver can determine 3 dimensional position (Latitude, Longitude and Elevation) when 4 or more satellites are in view. When only 3 satellites are available the last elevation value computed will be held fixed and the unit will compute 2 dimensional position.
  • Page 26 GENERATOR PRESET TIME REGISTERS (hex 00AC - 00B8) The 9 byte locations shown in the table below are used to preset the Generator. Only the least significant byte in each word location is used. The preset registers contain milliseconds through thousands of years. The registers are shown with their base address offset.
  • Page 27 GPS USER TIME BIAS (hex 00D2 - 00D4) The GPS User Time Bias is only used in the GPS Sync-gen mode to compensate for cable or preamplifier time delays. The available values range from -99999 to +99999 ns. There are two 16 bit words allocated for this parameter. The table below shows how the data is organized.
  • Page 28 Label Description Hex Address Offset COMP1-1 Tens & Units Microseconds 00E0 COMP1-2 Unit Msec & Hundreds Microsec 00E2 COMP1-3 Hundreds & Tens Milliseconds 00E4 COMP1-4 Tens & Unit Seconds 00E6 COMP1-5 Tens & Unit Minutes 00E8 COMP1-6 Tens & Unit Hours 00EA COMP1-7 Tens &...
  • Page 29 The following table lists the offset from the VME-SG-GPS base address where the Control and Vector registers for each interrupt source is located. Register Source Offset INT0 Control External Event 0000 INT1 Control Rate Generator 0002 INT2 Control Coincidence Compare #1 Pulse 0004 INT3 Control Coincidence Compare #2 Pulse...

  • Page 30: Vme-Sg-Gps Memory Map

    X/IN (External/Internal) - Bit 5 determines the response of the BIM during an interrupt acknowledge cycle. If the X/IN bit is clear the BIM will respond with vector data and a /DTACK signal. When set, no vector is supplied and no /DTACK is given. The VME- SG-GPS should always be configured with this bit cleared as no other device will supply the necessary interrupt vector.
  • Page 31 Rev. F Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 32 Base Address Location Offset (hex) Description 0088 Gen Freeze Reg 2, Word 2 (Tsec, Usec, Hmsec, Tmsec) 008A Gen Freeze Reg 2, Word 3 (Thours, Uhours, Tmin, Umin) 008C Gen Freeze Reg 2, Word 4 (Status*, Hdays, Tdays, Udays) Status bits: 1 - Reference Error 2 - SyncGen Phase Locked 3 - Reserved...
  • Page 33 Base Location Address Description Offset (hex) 00A0 Configuration Reg 1 bits: 0 - Mode Bit 1 - Mode Bit 2 - Gen Stop - Gen Preset Enable - External Start Enable - External Osc Select - NU - Interrupt Enable - NU - NU 10 - NU...
  • Page 34 Base Address Location Offset (hex) Description 00AC Gen Preset (0, Msec) 00AE “ “ (Hmsec, Tmsec) 00B0 “ “ (Tsec, Usec) 00B2 “ “ (Tmin, Umin) 00B4 “ “ (Thours, Uhours) 00B6 “ “ (Tdays, Udays) 00B8 “ “ (0, Hdays) 00BA “...
  • Page 35 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
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  • Page 71 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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