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C-DITEG   Processor   Drawer
TACTICAL   VIDEO   GENERATOR

Fire Controlman Volume 05-Display Systems and Devices
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O-data  receivers Input/output   (I/O)   controller Control   synchronizer System   memory Peripheral   input/output Formatter Function   generator Tabular   video   generator I-data  transmitters O-DATA  RECEIVERS.—  The   O-data   receivers accept  32  bits  of  parallel  computer  data,  provide  the proper  level  shifting,  and  send  the  computer  data  to the  I/O  controller. INPUT/OUTPUT CONTROLLER.—  The input/output ( I / O )    c o n t r o l l e r    m a n a g e s    t h e communication   with   the   system   computer.   The   I/O controller  receives  computer  data  through  the  O-data receivers  and  sends  data  to  the  computer  through  the I-data    transmitters. There  are  two  identical  I/O channels  in  the  C-DITEG,  although  only  one  maybe active  at  any  time.  Channel  0  is  the  default  channel; and   if   the   active   channel   fails,   the   normally   idle channel  will  become  active. The  I/O  controller  decodes  incoming  computer data   for   C-DITEG   control   words   or   display   data words.  Display  data  is  sent  to  system  memory. CONTROL   SYNCHRONIZER.—   The   control synchronizer  uses  four  crystal  oscillators  to  generate the  system  clocks.  The  crystal  oscillators  generate  40- MHz,   27-MHz,   24-MHz,   and   16-MHz   clocks.   The 40-MHz  clock  is  divided  by  two  and  four  to  generate 50-nanosecond   and   100-nanosecond   clock   pulses. The  27-MHZ  clock  is  divided  by  16  to  become  the universal  asynchronous  receive/transmit  clock.  The 24-MHz  and  16-MHz  clocks  are  divided  by  two  to become  the  video  format  pixel  clocks. The  control  synchronizer  also  produces  the synchronization  and  timing  signals  for  the  three tabular   (text   only)   video   formats. These  video formats   are:   40 9-pixel  character x  80  x  9  (40-line  x  80-column  x width), 40 x 80 x 8, and 16 x 48 x 9. SYSTEM  MEMORY.—  The   system   memory fiction   consists   of   512K   of   random   access   memory (RAM)   and   192K   of   erasable,   programmable read-only  memory  (EPROM).  The  RAM  is  used  for temporary   data   storage   (file   memory).   The   EPROM contains   the   operational   firmware   required   by   the C-DITEG.   If   the   C-DITEG   has   field   change   3 installed,  the  RAM  is  increased  to  1M. PERIPHERAL I/O FUNCTION.— The peripheral   I/O   (PIO)   function   interfaces   the   external peripherals  with  the  C-DITEG.  The  peripherals  are up   to   two   hard-copy   printer-plotters,   up   to   six   TV monitors,  up  to  six  display  control  consoles  (DCCs), and  up  to  two  large  screen  displays  (LSDs).  The  PIO function also generates data and control signals for the tabular   video   generator.   The   PIO   function   also interrogates   the   display   control   consoles   for   any switch   actions.   If   a   switch   action   has   occurred,   the switch   data   is   received   from   the   DCC   by   the   PIO, reformatted,  and  transferred  to  the  system  computer, via   the   system   memory,   by   the   I/O   controller.   The PIO  also  sends  the  signals  to  control  the  lighting  of the  lamps  on  the  DCC  control  panels. When  a  hard-copy  printout  is  requested,  the  PIO obtains  the  data  from  the  video  drawer’s  bit  mapped memory,  reformats  the  data  for  the  printer-plotter,  and sends  the  data  to  the  printer  plotter. FORMATTER.—  The formatter generates formatted  display  data  for  the  display  control  console graphics  display,  large  screen  display,  and  the  hard- copy   printer-plotter   from   file   memory   data.   The formatter  also  produces  the  control  signals  for  the function  generator  of  the  processor  drawer  and  the  bit map  memory  of  the  video  drawer. FUNCTION   GENERATOR.—   The   function generator  creates  display  data  consisting  of  conies (circles  and  ellipses),  vectors,  and  characters  from formatted   data   received   from   the   formatter.   This display  data  is  sent  to  the  video  drawer  in  the  form  of pixel  data  for  the  generation  of  DCC  and  large  screen displays. 4-23






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