CONTROLS
CAMAC 181
DIGITAL I/O
ED-35359

CONTROLS HARDWARE RELEASE NO. 49.0

CAMAC 181 Module

Digital Input/Output

Robert J. Ducar

December 10, 1985

CONTENTS

1  DESCRIPTION
2  CAMAC 181 OP CODES
3  CAMAC 181 MODULE - I/O ASSIGNMENTS
4  CAMAC 181 MODULE - FRONT PANEL
5  SPARES
6  DOCUMENTATION          
7  PALS DOCUMENTATION
         
 1  DESCRIPTION
             The one-wide CAMAC  181  module  provides  basic  digital
          input  and  output  control facilities.  The module provides
          twelve control lines and accepts 16 bits  of  monitor  data.
          Inputs and outputs are active high and TTL compatible.
             The 181 module is a modified version  of  the  CAMAC  180
          module  and  is  quite  similar in operation.  The presented
          monitor data are latched into on-board  cache  memory  every
          ten  microseconds.   A front panel led, "UA", indicates that
          the monitor update process is active.
             The twelve control lines are normally static high or  low
          outputs.   A  two  microsecond strobe pulse is always issued
          when the control bit register is overwritten.  When the  "P"
          bit  is asserted, all addressed output lines will pulse high
          for  two  microseconds  as  the  control  bit  register   is
          overwritten.  The pulsed feature is rarely used.
             The control and strobe lines are sourced by 74128 drivers
          and  may be terminated in 100 ohms.  The monitor line inputs
          are terminated with 1000 ohms to ground.  Upon clear command
          or powering-up, all control lines are set low.
             This module will assert LAM if the  monitor  word  update
          process  is  not  active.   Provision  has also been made to
          assert LAM when any bit of the upper and/or  lower  byte  of
          the  16  bit  monitor word is not asserted.  This feature is
          activated by insertion of 74LS30 chips at IC  locations  #52
          and/or #53.
 
          2  CAMAC 181 OP CODES
                  All codes return module Q and X immediately.
                  This module may assert LAM.

              F(0) A(0)   Read Monitor Word 
              ---------   
                          R16              -               R1
                          -----------------------------------
                          M15 (MSB) - Monitor Data - (LSB) M0
                          F(0) A(1-15) codes are acknowledged but are
                          not appropriate to this implementation.

              F(1) A(0)   Read Status and Control Bit Register
              ---------
                           R16 | R15 | R14 | R13 | R12 - R1 
                          ----------------------------------
                          | P  | LAM | UA  |  0  | C11 - C0 |
                          P: When asserted, P indicates that the last
                             overwrite of the control bit register 
                             was pulse mode.
                          LAM: When asserted, indicates UA is false.
                               May also indicate that any bit of the
                               upper and/or lower byte of the monitor 
                               word is not asserted.
                          UA:  Update Active.  Assertion indicates 
                               the monitor update process is active.

              F(4) A(0)      This code is acknowledged but is not 
              ---------     appropriate to this implementation.
 
              F(6) A(0)   Read Module Number 
              ---------
                          R16  - R9 | R8      -      R1
                          -----------------------------
                          |    0    | B5 Hex, 181 Dec |
               F(9) A(0)   Reset Module
               ---------
                           This command is a logical or with 
                           Z*S2 and power-up clear.  It resets 
                           the control outputs to zero.

               F(17) A(0)  Write P and Control Bit Register
               ---------- 
                             W16 | W15-W13 | W12  -  W1
                            ----------------------------
                           |  P  |    X    | C11  -  C0 |
                           P=0: All Control Bits static 0 or 1.
                           P=1: Control Bit output pulses for
                                2 microseconds if set.
 
          3  CAMAC 181 MODULE - I/O ASSIGNMENTS
               Rear I/O:  36 Position Edge Connector   A = R    B = L
               POS  SIGNAL            POS  SIGNAL               
               ---  --------------    ---  ----------------
                1L  M15 (MSB)          1R  M14
                2L  M13                2R  M12
                3L  M11                3R  M10
                4L  M9                 4R  M8
                5L  M7                 5R  M6
                6L  M5                 6R  M4
                7L  M3                 7R  M2
                8L  M1                 8R  M0 (LSB)
                9L  C11                9R  C10
               10L  C9                10R  C8
               11L  C7                11R  C6
               12L  C5                12R  C4
               13L  C3                13R  C2
               14L  C1                14R  C0
               15L  MA8 (always 0)    15R  MA4 (always 0)
               16L  MA2 (always 0)    16R  MA1 (always 0)
               17L  BP /AIP           17R  STROBE (2 usec)
               18L  Common            18R  Common
             The BP /AIP output reflects the state of the P1  line  of
          the  CAMAC dataway connector.  In Tevatron crates, this line
          generally indicates the state of the  Tevatron  Abort  Link.
          BP  (active  high) signifies Beam Permit.  /AIP (active low)
          signifies Abort In Progress.  This line is driven by a 74128
          driver and may be terminated in 100 ohms.
 
          4  CAMAC 181 MODULE - FRONT PANEL
                  The CAMAC 181 module has the following front
                  panel features:
               N led:  Red (stretched)
               LAM led:  Red
               UA led:  Green (stretched), Indicates monitor 
                        update process is active.
 
          5  SPARES
             A supply of CAMAC 181 operational spares is maintained on
          the  second  floor  of the Linac Annex.  Upon replacement be
          sure to check the optional installation  of  74LS30  ICs  at
          locations #52 and #53.
 
          6  DOCUMENTATION
               0812-ED-35359  Schematic
               0812-BD-35360  Artwork
               0812-BD-35361  Master Drawing
               0812-MD-34863  Outline Drawing
               0812-MC-35522  Front Panel Mechanical
               0812-MC-35523  Front Panel Silkscreen
 
          7  PALS DOCUMENTATION
               Directory:   DEVL::USR$DISK3:[DUCAR.PALS]
               Filenames:  18151A.DAT Camac 181 RF-102B
          rjd:  DEVL::USR$DISK3:[DUCAR.DOC]CMC181.RNO

Security, Privacy, Legal