CDF COT - ASDQ Operation

Setting Control Voltages:

The 6 control voltages for the ASDQ daughter boards are:

1. ATN - attenuation switch [`off'=0V, `on'=3V, default `off']
2. DTH - disc. thresh. [0 to 2V, default 250mV]
3. TRE - even trig. ref. [0 to 5V]
4. TRO - odd trig. ref.
5. QEN - dE/dx (charge) disable [`off'=0V, `on'=3V, default `off']
6. QDR - drain current (output width) [-3 to 3V, default 0V]

We use the 32-channel VMIC-4132 DAC:

• +/- 5V, 12-bit, 10mA output
• built-in testing (ADC)
• one module/quadrant/East(West):
  • CH 01-06 = SL1 (SL2)
  • CH 07-12 = SL4 (SL3)
  • CH 13-18 = SL5 (SL6)
  • CH 19-24 = SL8 (SL7)
  • CH 25-32 = (spare)

A stand-alone C-routine using VISION software sets the control voltages:

• cotcv.c - DAC utilities (using VISION)
• setcv.c - user interface

1. setup fision
2. cd ~ambrose/vme/dac/
3. ./setcv

Upon running setcv, the following list of commands is available:

 Command list:

    c                  -->  goto command line
    e [text]           -->  echo text
    f [file]           -->  input script file
    h                  -->  help list
    p                  -->  command line prompt
    q                  -->  quit program

    mc                 -->  close server
    mo [serv] [addr]   -->  open server at address (hex)
    mr [addr]          -->  read address (hex)
    mv [valu]          -->  verbose value (0-3)
    mw [addr] [data]   -->  write data (hex)

    dc                 -->  close DAC
    dl [func]          -->  DAC LED (0=off,1=on,>1=blink)
    do [serv] [addr]   -->  open DAC, go online
    dr [chan]          -->  read channel (1-32,0=all)
    dt [chan]          -->  test channel (1-32,0=all)
    dv [valu]          -->  verbose value (0-1)
    dw [volt] [chan]   -->  write voltage (integer,mV)

    atn [volt]         -->  attenuation (0=off,3000=on)
    dth [volt]         -->  disc threshold
    tre [volt]         -->  trigger ref (even)
    tro [volt]         -->  trigger ref (odd)
    qen [volt]         -->  charge enable (0=on,3000=off)
    qdr [volt]         -->  drain current

    ea, eb, ec, ed     -->  open East Quad A,B,C,D
    wa, wb, wc, wd     -->  open West Quad A,B,C,D
    def                -->  apply default settings
    tst [nv] [nt] [fn] -->  run module test procedure

    co [SL] [QD]              -->  open COT DAC, go online
    cr [CV] [SL] [QD]         -->  read COT DAC values
    ct [CV] [SL] [QD]         -->  test COT DAC values
    cw [CV] [volt] [SL] [QD]  -->  write COT DAC values

 Command(): q

Only the four commands c* are relevant for COT operation, and can be run interactively (by entering setcv) or from the Unix command line by passing the commands as parameters to setcv (separating each by a -). Here, SL refers to superlayer (1-8, or 0 for all), QD to quadrant (a-d or 0 for all), and CV is the control voltage (atn, dth, tre, etc.). Voltages [volt] are entered as integer millivolts.

For example, to open all DAC modules in SL8, set the thresholds to 350 mV, and set QDR to 1000mV, use the following commands:

    co 8
    cw dth 350 8
    cw qdr 1000 8

    setcv -co 8 -cw dth 350 8 -cw qdr 1000 8