evertz 8950 Instruction Manual
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evertz 8950 Instruction Manual

Digital vitc reader
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© Copyright 1996
EVERTZ MICROSYSTEMS LTD.
5288 John Lucas Drive, Burlington, Ontario, Canada, L7L 5Z9
Phone:
905-335-3700
Fax:
905-335-3573
Internet:
Sales:
Tech Support: eng@evertz.com
Web Page:
Revision 1.1, October, 1996
The material contained in this manual consists of information that is the property of Evertz Microsystems and is
intended solely for the use of purchasers of the 8950 Digital VITC Reader. Evertz Microsystems expressly
prohibits the use of this manual for any purpose other than the operation of the 8950.
All rights reserved. No part of this publication may be reproduced without the express written permission of Evertz
Microsystems Ltd.
Copies of this guide can be ordered from your Evertz products dealer or from Evertz
Microsystems.
Model 8950 Digital VITC Reader
Instruction Manual
sales@evertz.com
http://www.evertz.com

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  • Page 1 Revision 1.1, October, 1996 The material contained in this manual consists of information that is the property of Evertz Microsystems and is intended solely for the use of purchasers of the 8950 Digital VITC Reader. Evertz Microsystems expressly prohibits the use of this manual for any purpose other than the operation of the 8950.
  • Page 2 WARNING Changes or Modifications not expressly approved by Evertz Microsystems Ltd. could void the user’s authority to operate the equipment. Use of unshielded plugs or cables may cause radiation interference. Properly shielded interface cables with the shield connected to the chassis ground of the device must be used.
  • Page 3 Model 8950 Digital VITC Reader Manual REVISION HISTORY REVISION DESCRIPTION DATE Original issue January 96 Added Chapter 5, Technical Description October 96 Updated Chapter 2, Installation November 96 Updated Chapter 5 May 97...
  • Page 4 Model 8950 Digital VITC Reader Manual This page left intentionally blank...

  • Page 5: Table Of Contents

    2.1. REAR PANEL..........................2-1 2.1.1. Digital Video Connections ..................... 2-1 2.1.2. Linear Time Code Connections..................2-1 2.1.3. Analog Monitor Connections (8950-MON option) ............2-1 2.1.4. Remote Control Connections ..................2-1 2.1.5. Power Connections ....................... 2-2 2.2. MOUNTING ..........................2-2 2.3.
  • Page 6 Selecting the Serial Port Data Format................3-9 3.4.3. Testing the Serial Port....................3-10 3.4.4. Adjusting the Front Panel Display Brightness ............. 3-10 3.4.5. Resetting the 8950 to Factory Defaults ............... 3-10 3.4.6. Displaying the 8950 Software version................. 3-10 3.5. CHARACTER GENERATOR FUNCTIONS ................3-10 3.5.1.
  • Page 7 Analog Monitor Output - optional (8026-31, 8026-32) or (8029-31, 8029-32)....5-4 Figures Figure 2-1: 8950 Rear Panel......................2-1 Figure 2-2: Typical Application of 8950 for Character Generation and Translation to LTC ..2-5 Figure 3-1: Front Panel Layout ....................3-1 Figure 3-2: Overview of the 8950 Programming Menu System ...........3-5 Figure 3-3 Overview of the 8950 Engineering Menu ..............3-6...
  • Page 8 Model 8950 Digital VITC Reader Manual VITC/Char Output Circuitry ........................8037-33B LCA Circuit ............................8037-34B Optional Colour Frame & Ref Video Circuit ..................8037-35B Sub-Module Header ...........................8037-36B VITC/CHAR Generator Sub-Module Component Layout..............8037-82B Display Board Schematic ........................5220-31C Display Board Component Layout .....................5220-89C Power Supply Schematic ....................8102-31A Power Supply Component Layout ..................8102-80A...

  • Page 9: Overview

    Model 8950 Digital VITC Reader Manual OVERVIEW The 8950 is a multi-purpose Digital VITC Reader that extracts the vertical interval timecode directly from the digital bitstream. The model 8950 VITC reader's line range can be easily programmed from the front panel, thus permitting recovery of specific VITC data where multiple sets have been recorded.
  • Page 10 Model 8950 Digital VITC Reader Manual BIT: A binary representation of 0 or 1. One of the quantized levels of a pixel. BIT PARALLEL: Byte-wise transmission of digital video down a multi- conductor cable where each pair of wires carries a single bit.
  • Page 11 Model 8950 Digital VITC Reader Manual however, the parameter will reach a point where the data ca no longer be interpreted correctly, and the picture will be totally unrecognizable. COMPONENT ANALOG: The non-encoded output of a camera, video tape recorder, etc., consisting of the three primary colour signals: red, green, and blue (RGB) that together convey all necessary picture information.
  • Page 12 Model 8950 Digital VITC Reader Manual samples, and the other on a full field of samples. Three sets of flags are used to convey information regarding detected errors, to facilitate identification of faulty equipment or cabling. One set of flags is associated with each checkword, and the third is used to evaluate ancillary data integrity.
  • Page 13 Model 8950 Digital VITC Reader Manual TRS: Timing reference signals used in composite digital systems. (It is four words long). TRS-ID: Abbreviation for "Timing Reference Signal Identification". reference signal used to maintain timing in composite digital systems. (It is four words long.) 4:2:2 A commonly used term for a component digital video format.
  • Page 14 Model 8950 Digital VITC Reader Manual This page left intentionally blank OVERVIEW Page 1-6...
  • Page 15 2.4.2. Video Output ........................2-4 2.5. LINEAR TIME CODE TRANSLATOR OUT ..................2-4 2.6. TYPICAL APPLICATION ......................... 2-5 Figures Figure 2-1: 8950 Rear Panel......................2-1 Figure 2-2: Typical Application of 8950 for Character Generation and Translation to LTC ..2-5...
  • Page 16 Model 8950 Digital VITC Reader Manual This page left intentionally blank...

  • Page 17: Installation

    REMOTE CONTROL Figure 2-1: 8950 Rear Panel The following sections describe the purpose of the rear panel connectors of the 8950. Sections 2.1.1 to 2.1.3 describe the specific signals that should be connected to the 8950. 2.1.1. Digital Video Connections...

  • Page 18: Power Connections

    Ground 2.1.5. Power Connections LINE: The 8950 may be set for either 115v/60 Hz or 230v/50 Hz AC operation. The voltage selector switch is accessible on the rear panel. The line voltage connector contains an integral slow blow fuse (and a spare one).

  • Page 19: Changing The Fuse

    The 8950 requires that a digital video source be connected to the VIDEO IN SDI video input. The 8950 may be configured to accept either 525 or 625 line digital video in the component (4:2:2) format or 525 line digital...

  • Page 20: Video Output

    SDI digital video outputs are provided. 2.5. LINEAR TIME CODE TRANSLATOR OUT The 8950 provides a fully decoded and regenerated play speed LTC output containing the time and user bits of the VITC Reader. The output is available on an XLR connector at the rear panel. Output level is adjustable from approximately 0.5 V to 4 V using a trim pot inside the unit.

  • Page 21: Typical Application

    8950 MADE IN CANADA 115V: PARALLEL VIDEO OUT SERIAL .25 A VIDEO IN 230V: .125 A REMOTE CONTROL SERIAL DATA 12:45:30:00 DIGITAL VIDEO MONITOR Figure 2-2: Typical Application of 8950 for Character Generation and Translation to LTC INSTALLATION Page 2-5...
  • Page 22 Model 8950 Digital VITC Reader Manual This page left intentionally blank INSTALLATION Page 2-6...

  • Page 23: How To Operate The Digital Vitc Reader

    A front panel programming menu provides a quick and simple method of configuring the 8950 Digital VITC Reader for your application. Section 3.3 gives detailed information on the specific operations required to control the 8950.

  • Page 24: The Character Window-Button Group

    Following is a summary of the shifted key functions SHIFT+SETUP Enters the Engineering Setup menu system SHIFT+SELECT Resets the 8950 to factory defaults when you are in the FACTORY RESET menu item of the Engineering Setup Menu. OPERATION Page 3-2...

  • Page 25: An Overview Of The Status Indicators

    Indicates that the character generator keyer is enabled. (future) 3.2. AN OVERVIEW OF THE FRONT PANEL PROGRAMMING MENU The key to the operational flexibility of the 8950 Digital VITC Reader lies in the front panel programming menu system. The programming menu...

  • Page 26: Figure 3-2: Overview Of The 8950 Programming Menu System

    Char black+bkgnd Char black VCG FRAMES Vcg frames off Vcg frames on VCG FIELDS Vcg fields off Vcg fields on VCG SYMBOLS Vcg symbols off Vcg symbols on Figure 3-2: Overview of the 8950 Programming Menu System OPERATION Page 3-4...

  • Page 27: Engineering Setup Menu

    This menu should be used by advanced users only, as improper use can overwrite user setups. The 8950 Engineering Setup menu consists of a main menu with two or more choices for each menu item. The sub menu items are shown in lower case to allow them to be easily distinguished from the main level items.

  • Page 28: Programming The 8950 Operational Modes

    CCIR recommendation 601. Select 422 auto for operation with component video with a line rate of either 525 or 625 lines per field. The 8950 will auto detect the line rate and automatically reconfigure itself. Press SHIFT+WINDOW when you are not in the SETUP menus to display the standard that is currently active.

  • Page 29: Setting The Vitc Reader Line Range

    SELECT key. RDR START LINE and RDR END LINE determine a range of lines that the 8950 will look for VITC on. It will attempt to read VITC from the lower number to the higher number.

  • Page 30: Selecting The Character Size

    Model 8950 Digital VITC Reader Manual Select Rdsply direct to enable DIRECT display mode. Data is displayed exactly as it is read without 'look ahead' compensation. Displays from the VITC reader will be 'on time' but cannot be positioned at the very top of the raster.

  • Page 31: Programming The Engineering Setup Functions

    The SERIAL FORMAT menu item is used to set the word length, SERIAL FORMAT parity and number of stop bits of the remote control serial port. The 8950 Fixed to 8-N-1 currently supports only 8 bits, no parity, 1 stop bit.

  • Page 32: Adjusting The Front Panel Display Brightness

    Use the ! and "keys to adjust. Display Level = 2 3.4.5. Resetting the 8950 to Factory Defaults The FACTORY RESET menu item is used to return the 8950 to its factory FACTORY RESET When you press the ! or " keys, the display shows defaults.

  • Page 33: Positioning The Overall Character Display

    Model 8950 Digital VITC Reader Manual CHAR GEN WINDOW key to highlight the Status window. Use the CHAR GEN ON/OFF key to turn the Status window on or off and the arrow keys to move it to the desired location. Press the CHAR GEN WINDOW key to return to normal display mode.

  • Page 34: Parallel Remote Control Functions

    A 9 pin D connector located on the rear panel labelled REMOTE CTL provides 6 parallel control inputs for remote control of some of the model 8950 functions. The pinout of the D connector is as follows: Description Frame Ground...

  • Page 35: Serial Remote Control Protocol

    Model 8950 Digital VITC Reader Manual SERIAL REMOTE CONTROL PROTOCOL 4.1. OVERVIEW • Four wire communications channel utilized - RS-422 levels. Alternate 2 wire interface using RS- 232C levels • Data transmitted asynchronously, bit serial, word serial with data exchange between the devices being digital.

  • Page 36: Communications Protocol

    The Controller shall be denoted as the normal sender of a command (usually a computer). The Device shall be denoted as the normal sender of a Response ( the Evertz unit). All command values, arguments and data values shown in this document are expressed in hexadecimal format unless otherwise noted.

  • Page 37: Message Block Format

    Model 8950 Digital VITC Reader Manual to the broadcast communications state. The diagram shows the various states of the device. The designation R( ) indicates the data received from the controller, while the designation T( ) indicates the data transmitted by the Device.

  • Page 38: Commands

    Model 8950 Digital VITC Reader Manual MESSAGE variable length response message consisting of the data requested by the command message. CHECKSUM The two's complement of the one byte sum of the COMMAND ECHO, MESSAGE and the BYTE COUNT. For example, to request the current time code data in BCD format from the reader, the command...

  • Page 39: Table 4-2: Character Generator Commands And Their Valid Responses

    Model 8950 Digital VITC Reader Manual Command from Controlling Device Return to Controlling Device DATA DESCRIPTION DATA NAME BYTES ECHO BYTES BYTES Select Char Gen Size Preset Char Gen Window Pos’n Select Char Gen Window On/Off Select Char Gen Global On/Off...

  • Page 40: Data Formats

    Model 8950 Digital VITC Reader Manual 4.5. DATA FORMATS 4.5.1. Time Format Block 10 Frm 1 Frm 10 Sec 1 Sec 10 Min 1 Min 10 Hr 1 Hr Flags The Flags byte is a bitmapped byte of the timecode flag bits as follows:...

  • Page 41: Video Character Inserter Commands

    Model 8950 Digital VITC Reader Manual 02 = 4:2:2 625 03 = 4 Fsc 525 Sense Video Standard Returns 2 bytes as described in the Select Video Standard Command. 4.7. VIDEO CHARACTER INSERTER COMMANDS Several of the VCG commands need to specify which VCG window they apply to. The following table defines the VCG window numbers.
  • Page 42 Model 8950 Digital VITC Reader Manual Turns individual windows on and off. 00 = Off 01 = On Sense Char Gen Global On/Off Returns 1 byte as defined below. Select Char Gen Global On/Off 1 byte Turns all windows on and off.

  • Page 43: Reader Commands

    Model 8950 Digital VITC Reader Manual Sets the starting position of a VCG raster with respect to the active picture area. For example to start the raster down 2 lines from the top of active picture set the vertical position to 2. To start the raster 5 pixels to the right of active picture set the horizontal position to 5.
  • Page 44 Model 8950 Digital VITC Reader Manual Each bit represents a variable length block of data which is requested. Time and User Bits are formatted according to the Select RDR Mode command above. The broadcast data blocks are assembled in the following order:...

  • Page 45: Technical Description

    5.2.1. DIP Switch Functions The main circuit board of the model 8950 contains an 8 position DIP switch which is used to invoke various diagnostic and calibration functions. The functions of each switch are described below.

  • Page 46: Circuit Description

    (8037) which plugs into the main board via a forty-pin header. The relevant schematic drawings are shown in brackets for each section of the circuit. The heart of the model 8950 circuitry is a programmable logic array (LCA) device (U17) which contains the keyer circuitry and the support circuitry for addressing various devices on the board.

  • Page 47: Front Panel Display And Pushbuttons (5220-31)

    Model 8950 Digital VITC Reader Manual board. Addressable latches U24 and U34 provide mode select control lines used throughout the board. SERIAL MONITOR OUT SERIAL OUT SERIAL PARALLEL PARALLEL SERIAL KEYER VITC RDR/CHAR ANALOG GENERATOR MONITOR MAINS IN SWITCHING POWER...

  • Page 48: Serial Digital Video Input (8025-33)

    Connect a digital volt meter set on a 10 volt range to the Loop filter test point LF (located at the rear left corner of the 8025 board). Connect a serial digital video signal to the serial input of the 8950. Connect the serial output of the 8950 to a digital monitor, or connect the analog monitor output of the 8950 to an analog monitor.

  • Page 49: Serial Digital Video Output (8025-34)

    5.3.5. VITC Reader/Character Generator Logic (8034-31, 8034-32, 8034-33) or (8037-31, 8037-32, 8037-33) The 8950 may be fitted with either a 8034 or 8037 submodule which contains the VITC reader and character generator logic circuitry. Both submodules contain similar circuitry for the VITC reader and Character generator.

  • Page 50: Keyer Lca (8025-32, 8025-35, 8025-37)

    5.3.6. Keyer LCA (8025-32, 8025-35, 8025-37) The heart of the 8950 is the Keyer LCA U17 on the main board. Input video from the serial input circuitry is fed to the inputs of the keyer LCA by U7, U8, and U9.

  • Page 51: Analog Monitor Output - Optional (8026-31, 8026-32) Or (8029-31, 8029-32)

    MCU and is used to control the output level of the LTC. For 8950 units fitted with the 8034 VITC Reader submodule the LTC output driver circuitry is contained on a small circuit board (8036) mounted to the LTC Out connector.

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