Symmetricom bc635VME Bedienungsanleitung
bc635VME/bc350VXI
Time and Frequency
Processor
Revision E
User’s Guide
8500-0019
January, 2004
Symmetricom Inc bc635VME/bc350VXI Time and Frequency Processor (Rev. E) i
bc635VME/bc350VXI
TIME AND FREQUENCY PROCESSOR
TABLE OF CONTENTS
SECTION PAGE
CHAPTER ONE
INTRODUCTION
1.0 General.................................................................................................................................. 1-1
1.1 Key Features ......................................................................................................................... 1-1
1.2 Physical Overview ................................................................................................................ 1-2
1.3 Specifications........................................................................................................................ 1-3
1.3.1 Time Code Reader ....................................................................................................... 1-3
1.3.2 Time Code Generator................................................................................................... 1-3
1.3.3 Bus Characteristics ......................................................................................................1-3
1.3.4 Digital Inputs ............................................................................................................... 1-3
1.3.5 External 10MHz Input/Output ..................................................................................... 1-4
1.3.6 Digital Outputs............................................................................................................. 1-4
1.3.7 Oscillator Control Output ............................................................................................ 1-4
1.4 Environmental Specifications ...............................................................................................1-4
1.5 Functional Overview............................................................................................................. 1-4
1.5.1 Time ............................................................................................................................. 1-4
1.5.1.1 Time Sync Mode................................................................................................. 1-4
1.5.1.2 Time Format........................................................................................................ 1-5
1.5.1.3 Set Time .............................................................................................................. 1-5
1.5.1.4 Set Year...............................................................................................................1-5
1.5.1.5 Set Local Offset .................................................................................................. 1-5
1.5.1.6 Set Propagation Delay ........................................................................................ 1-5
1.5.1.7 Days .................................................................................................................... 1-6
1.5.2 Time Code..................................................................................................................... 1-7
1.5.2.1 Decode ................................................................................................................ 1-7
1.5.2.2 Generate .............................................................................................................. 1-7
1.5.3 Signals.......................................................................................................................... 1-7
1.5.3.1 Heartbeat (Periodic) Output................................................................................ 1-7
1.5.3.2 Strobe Output...................................................................................................... 1-7
1.5.3.3 Event Input.......................................................................................................... 1-8
1.5.3.4 Frequency Output ............................................................................................... 1-8
1.5.4 Interrupts...................................................................................................................... 1-8
1.5.5 Oscillator Parameters................................................................................................... 1-8
1.5.6 Sync RTC Time to External Time ............................................................................... 1-8
1.5.7 Board Reset.................................................................................................................. 1-8
TABLE OF CONTENTS
bc635VME/bc350VXI Time and Frequency Processor (Rev. E) Symmetricom Inc
ii
CHAPTER TWO
INSTALLATION AND SETUP
2.0 VME/VXI Compatibility Switches....................................................................................... 2-1
2.1 VMEbus Base Address Selection ......................................................................................... 2-2
2.2 bc350VXI Logical Address Selection .................................................................................. 2-2
2.3 Jumpers ................................................................................................................................. 2-3
2.4 Installation ............................................................................................................................ 2-5
CHAPTER THREE
INTERFACES
3.0 General.................................................................................................................................. 3-1
3.1 Data Input and Output........................................................................................................... 3-1
CHAPTER FOUR
FIFO DATA PACKETS
4.0 General.................................................................................................................................. 4-1
4.1 Writing Data Packets ............................................................................................................ 4-1
4.1.1 Packet “A” - Select TFP Operational Mode ................................................................ 4-2
4.1.2 Packet “B” Set Major Time ......................................................................................... 4-4
4.1.3 Packet “C” Command Input......................................................................................... 4-5
4.1.4 Packet “D” Load D/A Converter ................................................................................. 4-5
4.1.5 Packet “F” Heartbeat (Periodic) Control ..................................................................... 4-6
4.1.6 Packet “G” Offset Control ........................................................................................... 4-9
4.1.7 Packet “H” Set Time Code Format for Mode 0......................................................... 4-10
4.1.8 Packet “I” Clock Source Select ................................................................................. 4-10
4.1.9 Packet “J” Send Data TO GPS Receiver ................................................................... 4-10
4.1.10 Packet “K” Select Generator Code .......................................................................... 4-11
4.1.11 Packet “L” Set Real Time Clock ............................................................................. 4-11
4.1.12 Packet “M” Local Time Offset Select (GPS Modes Only) ..................................... 4-12
4.1.13 Packet “O” Request Data From The TFP ................................................................ 4-13
4.1.14 Packet “P” Path Selection ........................................................................................ 4-15
4.1.14.1 Bit Descriptions .............................................................................................. 4-15
4.1.14.2 Upper Nibble Bit Descriptions ....................................................................... 4-16
4.1.15 Packet “Q” Set Disciplining Gain............................................................................ 4-17
4.1.16 Packet “S” Set Year ................................................................................................. 4-17
TABLE OF CONTENTS
Symmetricom Inc bc635VME/bc350VXI Time and Frequency Processor (Rev. E) iii
CHAPTER FIVE
PROGRAMMING EXAMPLES
5.0 General.................................................................................................................................. 5-1
5.1 Reading Time on Demand .................................................................................................... 5-1
5.2 External Event Time Capture ............................................................................................... 5-2
5.3 Program Periodic Frequency of 1000 HZ............................................................................. 5-2
5.4 Set Mode 1 and the Major Time ........................................................................................... 5-3
5.5 Select Mode 0 (IRIGB)and Advance TFP 2.5 Milliseconds ................................................ 5-3
CHAPTER SIX
INPUTS AND OUTPUTS
6.0 Inputs and Outputs ................................................................................................................ 6-1
CHAPTER SEVEN
ADJUSTMENTS
7.0 General.................................................................................................................................. 7-1
TABLE OF CONTENTS
bc635VME/bc350VXI Time and Frequency Processor (Rev. E) Symmetricom Inc
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Symmetricom Inc bc635VME/bc350VXI Time and Frequency Processor (Rev. E) 1-1
CHAPTER ONE
INTRODUCTION
1.0 GENERAL
The bc635VME/bc350VXI Time and Frequency Processor User’s Guide provides the following
information:
•Introduction and key feature description.
•Installation and setup.
•Detailed operation and programming interfaces.
•Input and output signals.
•Programming examples.
1.1 KEY FEATURES
The Time and Frequency Processor (TFP) has been designed with the following key features:
•Time on demand (days through 0.1 microseconds) with zero latency. This feature is
implemented with hardware registers which latch the current time upon host request.
•Event logging (days through 0.1 microseconds). This feature is implemented with a second
set of hardware registers. Time is captured on a positive or negative input edge.
•Six operational modes are supported. Modes are distinguished by the reference source.
Mode Source Of Synchronization
0Timecode – IRIG-A IRIG-B XR3 2137 NASA 36
1Free running - on board VCXO used as reference.
21 PPS - accepts input one pulse per second.
3RTC - uses battery backed on board real time clock IC.
5GPS (optional) - double wide configuration including GPS receiver.
(obsolete)
6GPS (optional) - uses GPS receiver/antenna (receiver in antenna).
CHAPTER ONE
1-2 bc635VME/bc350VXI Time and Frequency Processor (Rev. E) Symmetricom Inc
•Provides an output clock synchronized to the selected reference; programmable 1, 5, or
10MHz TTL.
•All modes of operation are supplemented by flywheel operation. For example, if
synchronization source is lost, the TFP will continue to function at the last known reference
rate.
•Generates synchronized IRIG B timecode. Modulated and DC level shift formats are
produced simultaneously. Also generates IRIG H DC level shift.
•Programmable frequency output (periodics) is provided. The output frequency is 10,000,000
/ (n1 * n2). 1<n1<65536 & 1<n2<65536.
•A time coincidence strobe output is provided. Programmable from hours through
milliseconds. This strobe also has an each second mode programmable to milliseconds.
•Five maskable interrupt sources are supported. IRQ levels one through seven are
programmable.
Int. # Source Of Interrupt
0External event input has occurred.
1Periodic output has occurred.
2Time coincidence strobe has occurred.
3One second epoch (1PPS output) has occurred.
4Output data packet is available.
•Time-of-day, hours, minutes, and seconds are displayed on front panel LED's.
•Most inputs and outputs are accessible via the P2 connector.
1.2 PHYSICAL OVERVIEW
The TFP is a B size module (6U X 160 mm). Operation is controlled by a block of thirty-two
D16 registers written and read by the host via the VMEbus (A16 : D16). The TFP is available in
two versions. The bc635VME is intended for use in a VMEbus system with most I/O signals
available on rows A and C of the P2 connector. The bc350VXI is intended for use in a VXIbus
system, and is shipped without a P2 connector. A dip switch is used to select VME or VXI
compatibility. In VMEbus systems the register block can be located on any 64 byte boundary.
In VXIbus systems the register block can be located at any of the 256 logical addresses (A15 and
A14 must be high). The logical address is returned during an interrupt acknowledge cycle.
INTRODUCTION
Symmetricom Inc bc635VME/bc350VXI Time and Frequency Processor (Rev. E) 1-3
1.3 SPECIFICATIONS
1.3.1 TIMECODE READER
Format – AM IRIG B XR3 2137 NASA 36.
Carrier Range +/- 50ppm.
Modulation Ratio 3:1 to 6:1.
Input Amplitude 0.5 to 5 volts peak to peak.
Input Impedance 10KΩAC coupled.
Format - DCLS IRIG A IRIG B NASA 36.
Carrier Range +/- 50ppm.
Input Amplitude TTL/CMOS Compatible
Input Impedance 10KΩDC coupled.
1.3.2 TIMECODE GENERATOR
Format - AM IRIG B.
Modulation Ratio 3:1.
Output Amplitude 0 to 10 volts peak to peak, adjusted by VR1, into 50Ω.
Format - DCLS IRIG B IRIG H
DC Level Shift TTL/CMOS compatible, into 50Ω.
1.3.3 BUS CHARACTERISTICS
Address Space A16, AM codes $29 and $2D, 64 bytes.
Data Transfer D16.
Interrupter D08(0), I(1-7), ROAK.
Power +5 @ 1.5amps +12 @ 50 milliamp -12 @ 30 milliamp
1.3.4 DIGITAL INPUTS
Event Capture TTL/CMOS positive or negative edge triggered.
20 nanoseconds minimum width 250 nanoseconds minimum period.
Input impedance 10KΩ
External 1PPS TTL/CMOS positive edge on time.
Twenty nanoseconds minimum width.
Input impedance 10KΩ
CHAPTER ONE
1-4 bc635VME/bc350VXI Time and Frequency Processor (Rev. E) Symmetricom Inc
1.3.5 EXTERNAL 10MHz INPUT/OUTPUT
10MHz Input TTL/CMOS 45% To 55% Duty Cycle.
1.5 To 4 Volts Peak-To-Peak, AC coupled 2.5KHz impedance.
Note: When an ovenized onboard oscillator is used, the external 10MHz input feature is
disabled. Instead the output of the ovenized oscillator appears on this pin. It can only
drive a single high impedance load.
1.3.6 DIGITAL OUTPUTS
1PPS TTL/CMOS positive edge on time, 200mS positive pulse, into 50Ω.
Periodics TTL/CMOS positive edge on time, into 50Ω. (See section 4.1.5)
Strobe TTL/CMOS positive edge on time, 1mS positive pulse, into 50Ω.
1, 5, 10MHz Clock TTL/CMOS positive edge on time, 5 & 10MHz square wave, 1MHz
80/20 duty cycle, into 50Ω.
1.3.7 OSCILLATOR CONTROL OUTPUT
Control Range 0 – 5V
Transfer Coefficient Positive
1.4 ENVIRONMENTAL SPECIFICATIONS
Temperature Operating 0 to 70ocentigrade.
Non-Operating -30 to +85ocentigrade.
Relative Humidity Operating 85% @ +85 o C, 1000 hours.
Altitude Operating -400 to 18,000 meters MSL.
1.5 FUNCTIONAL OVERVIEW
This section describes the functions provided by the bc635VME/bc350VXI Time and Frequency
Processor (TFP).
1.5.1 TIME
This function controls how the TFP card acquires and maintains time data. These functions
allow the user to select where to obtain time data, whether or not to manipulate the time data and
how to present the time data to the user system.
1.5.1.1 TIME SYNC MODE
This allows the user to select the operating mode (time source) of the TFP device. Available
modes are Time Code Decoding, Freerunning, External 1PPS, RTC & GPS (Optional).
INTRODUCTION
Symmetricom Inc bc635VME/bc350VXI Time and Frequency Processor (Rev. E) 1-5
1.5.1.2 TIME FORMAT
The event time capture and time registers of the TFP default to the decimal time format. The
major time registers are divided into 4 bit fields for each decimal digit of days, hours minutes
and seconds. For the GPS mode only, the time registers can operate in the binary format where
major time is represented as seconds since the GPS epoch.
1.5.1.3 SET TIME
This function allows the user to set the time on the TFP device. Decimal time values can be
entered into the time registers. This function is typically used when operating in either the
Freerunning or External 1PPS modes. While the function may be used when operating in Time
code or GPS modes, subsequent time data received from the selected reference source will
overwrite the loaded time.
1.5.1.4 SET YEAR
This function allows the user to set the year data. Typically, this function is used when the board
is operating in time code decoding mode. Many time code formats (including standard IRIG B)
do not include year information in the data. Using this function will allow the TFP device to
extract the time of year data from the time code source while using year information provided by
the user. The board will decode the year and roll over the days for a leap year (365-366-001) or a
non-leap year (365-001). The supported range is 1990 – 2037. The board will follow the input
time source if the input rollover day sequence does not match the board rollover day sequence as
defined by the programmed year.
1.5.1.5 SET LOCAL OFFSET
This function allows the user to program a local offset of 1-hour increments into the TFP device.
If the local offset value is nonzero, the device will adjust any reference timing information in
order to maintain a local time in TFP clock. Use of this function only affects the time data in the
TIME registers described in paragraph 3.1.
1.5.1.6 SET PROPAGATION DELAY
This function allows the user to command the TFP device to compensate for propagation delays
introduced by the currently selected reference source. For example, when the unit is operating in
Time code decoding mode, a long cable run could result in the input time code having a
propagation delay. The delay value is programmable in units of 100ns and has an allowed range
from –9999999 through +9999999.
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