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Datum bc635VME Operation And Technical Manual

Time and frequency processor
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  • Page 1 (217) 352-9330 | Click HERE Find the Microsemi / Symmetricom / Datum bc635VME at our website:...
  • Page 2 TIME AND FREQUENCY PROCESSOR Operation and Technical Manual October 1994 Datum inc B A N C O M M D I V I S I O N • 6541 Via del Oro, San Jose. CA 95119 T E L : 408/578-4161 F A X : 4(18/57X-4165...
  • Page 3 Operation and Technical Manual for the purpose stated above, provide that this notice is included as part of the copy. Additional copies are also available from Datum Inc for a nominal fee. In no case, however, does the supply of these manuals or the granting of rights to reproduce the manuals, grant any rights to use information contained within to reproduce the supplied equipment or software, either in whole or part.

  • Page 4: Table Of Contents

    3. O. 1 DATA INPUT AND OUTPUT CHAPTER 4 FIFO DATA PACKETS 4.0 GENERAL 4.1 WRITING DATA PACKETS 4.1.1 PACKET 'A' - SELECT TFP OPERATIONAL MODE 4.1.2 PACKET 'B' SET MAJOR TIME 4.1.3 PACKET 'C' COMMAND INPUT Datum Inc., Bancomm Div. bc635VME/bc350VXI Mnaual...
  • Page 5 Schematic Diagram, bc635VME/bc350VXI Time & Frequency Processor 1 1 6 0 0 Assembly and Parts list, bc635VME/bc350VXI Time & Frequency Processor 1 1 6 0 3 b c 6 3 5 V M E / b c 3 5 0 V X I...

  • Page 6: General

    CHAPTER 1 INTRODUCTION 1.0 GENERAL This bc635VME / bc350VX1 Time and Frequency Processor (TFP) Operation and Technical Manual provides the following information: Introduction and key feature description Installation and setup Detailed operation and programming interfaces Input and output signals Programming examples Drawing set 1.1 KEY FEATURES...

  • Page 7: Physical And Functional Overview

    VMEbus (A16 : D16). The TFP is available in two versions. The bc635VME is intended for use in a VMEbus system with most I/0 signals available on rows A and C of the P2 connector. The bc350VXI is intended for use in a VXlbus system, and is shipped without a P2 connector.

  • Page 8: Performance Specifications

    20 nanoseconds min.width 250 nanoseconds min. period TTL / CMOS positive edge on time EXTERNAL 1PPS 20 nanoseconds minimum width Datum Inc., Bancomm Div. b c 6 3 5 V M E / b c 3 5 0 V X I Manual...

  • Page 9: Digital Outputs

    1.3.5 DIGITAL OUTPUTS 1 PPS TTL / CMOS positive edge on time PERIODICS TTL / CMOS positive edge on time STROBE TTL / CMOS positive edge on time 1, 5, 10 MHz clock TTL / CMOS positive edge on time 1.3.6 EXTERNAL 10 MHz INPUT DIGITAL INPUT (or) TTL / CMOS 45% to 55% duty cycle...

  • Page 10: Vme / Vxi Compatibility Switches

    4 is in the VME position, the Status / ID byte returned during interrupt acknowledge cycles i s the user programmable vector loaded into the VECTOR register (discussed i n CHAPTER 3). SW I and SW2 LOCATION REVE Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 11: Vmebus Base Address Selection

    Base address selection for the VMEbus requires the setting of switch SW1 (A6 thru A13) and SW2 (A14 and A15). T h e bc635VME occupies 64 bytes in the A16 address space and can be freely located on any 64 byte boundary. The correspondence of the switch positions to the address bits is illustrated below.

  • Page 12: Jumpers

    RS-422 input lines. In the 3-4 position the 100 ohm load is by-passed. When the TFP is the terminal device on an RS-422 daisy chain the load should be used. When the TFP is Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 13: Installation

    A and C of the P2 connector are not used for VSB or other purposes. The TFP provides signal I/O on row A and C that may produce a conflict. I f a conflict does exist, a solution is to obtain a bc635VME with the P2 connector removed.

  • Page 14: General

    The table below summarizes the type of register located at each hexadecimal offset, and provides a brief description of the register function. The data format and detailed descriptions of each register are provided in the next section. Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...
  • Page 15 Release Lockout / Capture Time UNLOCK Acknowledge Register Command Register FIFO FIFO Input / Output (D16 or D08(0)) MASK Interrupt Mask INTSTAT Interrupt Status Interrupt Vector VECTOR LEVEL Interrupt Level 30-3E reserved bc635VME/bc350VXI Manual D a t u m Inc., Bancomm Div.
  • Page 16 The following form is recommended. Use of the global prevents optimizing out. timeptr = (short *) (BASE + OxOA) ; I* initialize pointer */ global dummy = *timeptr++ ; /* latch the time */ read time(timeptr) ; /* read the time */ Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...
  • Page 17 OFFSET OxOC T I M E D RESET VALUE NA OFFSET OxOE T I M E ] RESET VALUE NA OFFSET Ox10 T I M E 2 RESET VALUE NA OFFSET Ox12 T I M E 3 RESET VALUE NA OFFSET 0x14 T I M E 4 RESET VALUE NA For clarity the above offsets have been grouped.
  • Page 18 Must write to this register with bit 7 SET to cause TFP to take action HOST on the data packet previously written to the input FIFO. 8-15 reserved Datum Inc., Bancomm Div. b c 6 3 5 V M E / b c 3 5 0 V X I Manual...
  • Page 19 OFFSET 0x24 C M D RESET VALUE OxXX00 This register is used to command the TFP to perform specific functions. bit# NAME FUNCTION Event capture lockout (0 = disable lockout 1 = enable lockout). LOCKEN Prevents a new event from overwriting a previous event until an UNLOCK is performed (see OFFSET 0x20 UNLOCK).
  • Page 20 OFFSET Ox2C V E C T O R VALUE 0x/30(00 The VECTOR register holds the 8 bit Status / ID byte that the TFP will return during interrupt acknowledge cycles for VMEbus applications. bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.
  • Page 21 OFFSET Ox2E L E V E L RESET VALUE OxXX00 The LEVEL register selects the level at which an interrupt will be generated. Only bits 0 through 2 are used. These bits are encoded as follows: IRQ LEVEL disabled IRQ 1 IRQ2 IRQ3 IRQ4...

  • Page 22: General

    +/- 1 millisecond a forced jamsync is performed). I f the input code is lost or removed theTFP will continue to 'flywheel' at the last known code rate. Typical accuracy is 5 parts in 10E7 bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.
  • Page 23 TFP generates IRIGB path path selection variable (see 'P' packet) local local time offset (GPS modes only) 32000 VCXO DAC value (nominally centered) accum GPS to UTC leap second correction (only used in GPS modes) leapsec Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 24: Packet 'B' Set Major Time

    '5' b u f to RTC l o a d current time to the Real Time Clock IC '6' v a r i a b l e s d u m p s battery backed RAM to FIFO (factory use only) Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 25: Packet 'D' Load D/A Converter

    4.1.4 PACKET 'D' LOAD D/A CONVERTER The TFP reference crystal oscillator is voltage controlled using the buffered output of a 16 bit D/A converter as the controlling voltage. Packet D' allows the user to directly load a 16 bit value to the D/A converter.

  • Page 26: Packet 'G' Offset Control

    ' 0 ' - '9' BCD microsecond units byte 1 0 ' 0 ' - '9' BCD nanosecond hundreds byte 1 1 E T B For the IRIGB scenario described above a positive offset should be used. Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 27: Packet 'H' Set Timecode Format For Mode

    * * * WARNING *** If offsets larger than +/- 990 microseconds are used, then the TFP jamsynch feature must be turned off using packet 'P'. The reason for this requirement is that under normal operation i f a difference between the reference time and the TFP time is detected to be greater than +/- 1 millisecond the TFP timebase is "jammed"...

  • Page 28: Packet 'J' Send Data To Gps Receiver

    1 4 s e c o n d s units byte 1 5 E T B As usual all data is in the ASCII format. T h e TFP need not be in mode 3 when packet 'L' is downloaded. Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...

  • Page 29: Packet 'M' Local Time Offset Select (Gps Modes Only)

    Manual D a t u m Inc., Bancomm Div.

  • Page 30: Packet P' Path Selection

    The purpose of this packet is to allow the user to exercise control over certain TFP processes. The path packet is used to download a single byte. Each bit in the byte has a toggling action relative to a TFP function. The format is described below. bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.

  • Page 31: Packet 'Q' Set Disciplining Gain4

    4.1.16 PACKET 'S' SET YEAR This packet allows user to set year in modes 0, 1 and 2. byte 1 byte 2 byte 3 year tens byte 4 year units byte 5 4-10 bc635VME/bc350VX1 Manual D a t u m Inc., Bancomm Div.

  • Page 32: General

    #define CMD (short *)(BASE - F Ox2 4) #define VECTOR (short *) (BASE+ Ox2C) #define MASK (short*)(BASE+0x28) #define INTSTAT (short *)(BASE+ Ox2A) #define LEVEL (short *)(BASE+0X2E) #define UNLOCK (short *) (BAS E + Ox2 0) bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.

  • Page 33: Program Periodic Frequency Of 1000 Hz

    /* wait for 1PPS */ while(!(*INSTAT & 0x08) ; send_packet("B123112233') ; /* set the days thru seconds */ b c 6 3 5 V M E / b c 3 5 0 V X I Manual Datum Inc., Bancomm Div.

  • Page 34: Select Mode 0 (Irigb)And Advance Tfp 2.5 Milliseconds

    ; /* select mode 0 */ send_packet("HB') ; /* select IRIGB timecode */ /* advance 2.5 milliseconds */ send_packet("G+0025000") ; send_packet("PO4') ; /* disable jamsynchs */ Datum Inc., Bancomm Div. bc635VME/bc350VXI Manual...
  • Page 35 This Page Intentionally Left Blank b c 6 3 5 V M E / b c 3 5 0 V X I Manual D a t u m Inc., Bancomm Div.

  • Page 36: Inputs And Outputs

    GPS RS-422 Rx(+) oscillator control output GPS RS-422 Rx(-) not used ground timecode output (DCLS) GPS RS-422 Tx(-) ground GPS RS-422 Tx(+) 1,5,10 MHz output not used external 1PPS input ground periodics output GPS +12 VDC Datum Inc., Bancomm Div. bc635VME/bc350VX1 Manual...
  • Page 37 The following TFP specific signals are available on the P2 connector. TFP SIGNALS ON VMEbus P2 SIGNAL timecode input timecode return timecode output (DCLS) timecode output (AM) external event input strobe output periodic output external 1PP S input 1PPS output 1,5,10 MHz output 10MHz input oscillator control output...

  • Page 38: General

    An oven oscillator option was added and the transformer coupling option was removed. Additional signals were routed to the P2 connector. A pull down resistor was added to the INTACK line to prevent indeterminant state before LCA's are loaded. A board stiffener was added. bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.
  • Page 39 This Page Intentionally Left Blank bc635VME/bc350VXI Manual D a t u m Inc., Bancomm Div.
  • Page 40 CHAPTER 8 DRAWING SET 8.0 GENERAL This chapter contains the schematic diagram, assembly drawing, and parts l i s t f o r the bc635VME/bc350VX1 Time and Frequency Processor. bc635VME/bc350VXI Manual Datum Inc., Bancomm Div.
  • Page 41 This Page Intentionally Left Blank bc635VME/bc350VXI Manual D a t u m Inc., Bancomm Div.
  • Page 42 NO s o a s a s — a s e a WM a s — a s — a s o n s o a s 11E V 15 IONS DESCRIPTION • 4 4 0 0 060 140314 1009 PRODuCTIO4 FELEASE 09 APP 9 2 4E4 PEP (COO 2 0 6...
  • Page 43 E l l M I N I B N M I O S 1 1 1 . a l l M I N M i l M I S I N D M I M I D N I B M O M O 0 3 0 0 1 0 1 4 1 M •...
  • Page 44 1111 1 1 1 1 N I B I M O 1 E 1 — 7 6 0 8 1 4 0 7 0 0 6 1 1 0 3 1 1 0 2 07 0 6 6 3 1 7 4 —...
  • Page 45 I N S M I N I B M I N U M S I M I a l l M O I I I I I I M I S O S I M • SECONDS LNITS 2412907 FN0360 BATT P 0 5 2 51 10...
  • Page 46 1 1 1 1 1 1 11111 i l i a a i l a s s o l u m 5 8 1 451 1 •5V 2 14 I6 0 19 7 5 13 G N O P4 U 3 5 G N D 6740 G N O...
  • Page 47 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 UC200 Datum I n c 0 0 0 oo u n o o ( 0 0 0 BANCOMM D I V I S I O N FILE.
  • Page 48 S E U M I E g . . 5 5 E M E % n = 1 3 : 2 4 1 a 2 • • -2 : - 2 , ▪ - 4 - Z - E ASSY , bc635VME TIME & FREQUEN...

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