TrueTime VME-SG2 560-5608 Bedienungsanleitung
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Model 560-5608
VME-SG2
SERIAL NUMBER_______________
Revision A
January 8, 1999
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560-5608.IND.doc i Rev. A
TABLE OF CONTENTS
SECTION PARAGRAPH TITLE
ONE GENERAL INFORMATION
1.1 Scope of Manual
1.2 Purpose of Equipment
1.3 Physical Description
1.4 Environmental Specifications
1.5 Power Requirements
1.6 Signal Specifications
1.6.1 General To All Modes
A. VME Bus
B. Interrupts
C. Time Compare Outputs
D. External Freeze Event Input
E. Rate Generator Output
F. Auto Leap Year
G. Internal Oscillator
H. External Start Input
I. Pulse Rate
J. IRIG B DC (TTL) Time Code Output
K. IRIG B Amplitude Modulated Time Code Output
L. IRIG B DC (TTL) Time Code Output
1.6.2 Generator Specifications
A. General
B. External Time Base
1.6.3 Sync-Generator Specification
A. General
B. GPS Reference
C. Reference Code Input, Carrier
D. Reference Code Input, DC (RS-422)
1.6.4 I/O Connector Specifications
A. VME P2/J2 Connector
B. Front Panel BNC Connector
1. External Event Input
2. Reference Code Input
3. Generator Code Output
4. 1 PPS Output
TWO INSTALLATION AND OPERATION
2.1 Introduction
2.2 Installation
2.3 Operation, General Information
2.4 Operation, Detailed Information
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560-5608.IND.doc ii Rev. A
TABLE OF CONTENTS
(Continued)
SECTION PARAGRAPH TITLE
TWO 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 VME-SG-GPS Memory Map
2.5 Programming Examples
THREE MANUFACTURERS SPECIFICATIONS
FOUR DRAWINGS
Drawing Number Title
560-1146 VME-SG Front Panel Assembly/BOM
560-5608 VME-SG2 Assembly/BOM
560-5603 VME Processor Board Assembly/BOM
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GENERAL INFORMATION
1.1 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. All functions described in this manual are available in the
GPS-VME version. The VME-SG does not provide GPS related functions. Both the
GPS-VME and the VME-SG may be configured with the optional alphanumeric display
front panel assembly. In this manual these two board configurations are referred to as
the Model VME-SG-GPS.
1.2 PURPOSE OF EQUIPMENT
The VME-SG-GPS is a precision time source that conforms with the IEEE 1014.C-1
VMEbus Specification. The VME-SG-GPS operates in one of the following three
modes: Generator, GPS Synchronized Generator (GPS-VME only) or Code
Synchronized Generator. In all modes the VME-SG-GPS is designed to supply precise
time to a VME based computer. The time consists of microseconds through thousands
of years. In the Generator mode the time can be started, stopped and preset via the
VME bus. The Generator counters can also be started using an external reference 1
PPS pulse. In the GPS Synchronized Generator mode the card operates with the GPS
Engine. Time and position are derived from the NAVSTAR Global Positioning System
(GPS). In the Code Synchronized Generator mode the generator will phase lock to an
external IRIG B time code. The code format can be either amplitude modulated or DC
shift at RS-422 logic levels. In all synchronized modes the internal oscillator is
disciplined to remove any frequency offset with respect to the external reference. This
is necessary to maintain precise phase lock and to minimize drift error if the input
reference is lost.
Time information and status are available to the VME computer bus in five, 16 bit words.
Each word contains up to 4 packed BCD time values. Since no time ready flags must
be set before time information can be read, the data is immediately available (zero
latency). On board DIP switches select the memory address space where the VME-SG
board resides.
Two independent time capture register sets are provided. Time is latched or "frozen" in
one set of registers by a user read operation via the VME bus. This will provide time on
request. The second set of capture registers has the time latched into it when an
External Event pulse occurs. This allows time tagging of an External Event. An event
normally is programmed to generate an interrupt to flag its occurance.
A Rate Generator is provided that is configured by the user to output one of 5 different
pulse rates to the P2 connector. The Rate Pulse can also be configured to produce an
interrupt to the VME processor.
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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. The interrupt sources are the External Event, Rate Pulse, Time Compare 1 and
Time Compare 2.
The VME-SG-GPS is configured as an A16/D16 slave board responding to the Address
Modifier codes hex 29 (short non-priviledged) and hex 2D (short supervisory). The
VME-SG-GPS is memory mapped on any 256 byte boundary of the VME bus short
address space using the eight position DIP switch located on the board.
1.3 PHYSICAL DESCRIPTION
The VME-SG configuration is a single slot board meeting the VME standard 6U height
specification. When the optional display is added two slots are required. The GPS-VME
configuration requires two slots with a 6U height.
1.4 ENVIRONMENTAL SPECIFICATIONS
The Model VME-SG-GPS is designed to operate over a wide ambient temperature
range.
The environmental specifications are:
a. Operating - 0 to +50 degrees C (+32 to +122 F)
b. Storage - -17 to +100 degrees C (0 to +212 F)
c. Humidity - To 95% relative, non-condensing
1.5 POWER REQUIREMENTS
The maximum input power specifications are:
a.Voltage - +5VDC @ 700 ma
+ 12 VDC @ 50 ma each,
(from VME bus connector)
1.6 SIGNAL SPECIFICATIONS
1.6.1 GENERAL TO ALL MODES
A. VME Bus - Falling edge of /DSA to falling Access Time edge
of /DTAK is less than 400 nanoseconds.
B. Interrupts
Number - Four independent
Priority - Configurable to any of seven levels.
Sources - External Event
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- Programmed Rate Generator
- Programmed Compare Time #1
- Programmed Compare Time #2
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C. 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
Signal Level - Positive going, +5v @ +/- 6ma
See section 1.6.4 for P2/J2 pin assignment
D. External Freeze Event Input
Edge - Rising or falling
Input - Logic 0: 0 +.5 VDC
Voltage Logic 1: +2.5 to 5 VDC
Input - 4.7 K ohms to +5 VDC
The External Freeze Event signal may be input at the front panel BNC or on the
P2/J2 connector. See section 1.6.4 for P2/J2 pin assignment.
E. Rate Generator Output
Outputs a programmed pulse rate. Rising edge on-time.
Rates - 10K, 1K, 100, 10 and 1 Pulse Per Second (PPS)
Signal Level - Positive going, +5v @ +/- 6ma
See section 1.6.4 for P2/J2 pin assignment.
F. Auto Leap Year - calculated using year
G. Internal Oscillator (TCVCXO)
Frequency - 10MHz
Stability - 1 PPM, 0 to +50 Degrees C
Aging - < 1PPM/Year
H. External Start Input
Start Timing - Selectable positive or negative edge.
Input Voltage - Logic Zero: 0vdc, +/- .5vdc
Logic One: >+2.5vdc, <+5vdc
Input Impedance: 4.7K Ohms to +5v
The External Start signal is input on the P2/J2 connector.
See section 1.6.4 for P2/J2 pin assignment.
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I. Pulse Rate
Frequencies - 1PPS
Duty Cyle - 50%
Amplitude - 0vdc to +5vdc @ +/- 6ma
Timing - Positive going edge on time
See section 1.6.4 for P2/J2 pin assignment.
J. IRIG B DC Time Code Output (TTL)
Amplitude - 0vdc to +5vdc @ +/- 6ma
See section 1.6.4 for P2/J2 pin assignment.
K. IRIG B Amplitude Modulated Time Code Output
Amplitude - Adjustable from 0vpp to 10vpp into 600 Ohms to
ground
Ratio - Adjustable from 2:1 to 5:1
See section 1.6.4 for P2/J2 pin assignment.
L. IRIG B DC Time Code Output (RS-422)
Signal Output - RS-422 Logic Levels
See section 1.6.4 for P2/J2 pin assignment.
1.6.2 GENERATOR SPECIFICATIONS
A. General Specifications
Indicators - Power, 1PPS
LEDs
B. External Time Base Input (generator only)
Frequency - 10MPPS
Input Voltage - Logic Zero: 0vdc, +/- .5vdc
Logic One: >+2.5vdc, <+5vdc
The External Time Base signal is input on the P2/J2 connector.
See section 1.6.4 for P2/J2 pin assignment.
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1.6.3 SYNCHRONIZED GENERATOR SPECIFICATIONS
A. General Specifications
Indicator - Power
LEDs - 1 PPS
- Phase Locked
- Input Code Error
B. 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
Correction
Step Size
Position - Latitude, Longitude and Elevation 100 meters
2DRMS
Time To - <20 minutes when at least 4 satellites available
First Lock
User Time - + 99999 nanoseconds
Bias
Local Offset - + 12 hours
C. Reference Code Input, Carrier
Format - IRIG B122
Amplitude - 1vpp to 10vpp
Impedance - 10K ohms to ground
Ratio - 2:1 to 5:1
Error - Fixed at 3 frames
Bypass
Osc. Freq. - Better than 1 E -7, typically 5 E -8
Discipline
Phase - Less than 2 microsecond, typically
Accuracy less than 1 microsecond
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