4-Dec-97
						  Kevin Pitts


COT online database needs

 -assumes split wires, SL1 and SL2
   => 34560 channels, 1440 ASD boards, 360 TDCs


FE electronics (ASD) 
            per superlayer:  
                        superlayer              I   1 byte
                        discriminator thresh    R   4 bytes
                          (by quadrant => 4/SL)
                        dE/dx drain current     R   4 bytes
                        dE/dx enable            I   1 byte
                        attenuator              I   1 byte
            global (all COT)
                        Vref even               I   1 byte
                        Vref odd                I   1 byte
                        calib pulse width       I   1 byte
                        dE/dx calib sequence    I   1 byte
                                                   --------
                        total (all *8)             92 bytes

note:  Vref even, Vref odd, and calib pulse width all refer
       to the "timing" calibration.  dE/dx calib sequence would
       be an identifier which would be associated with a specific
       sequence of Vrefs and pulse widths for the dE/dx calibration.
       i.e. somewhere we would have it documented that for example
            sequence 2 was the following sequence with n (15)
            pulses at each point):
             1. Vref=1V, width=20nsec
             2. Vref=1V, width=30nsec
             3. Vref=1.5V, width=20nsec
                ...
       Then if we wanted to change the sequence at some point during
       the run, we would identify the new sequence in the database with
       a new number.
 

TDC
            global (all TDCs)
                        DSP program                4K bytes
            per TDC
                        max drift time          I   2 bytes
                        max hits/chan           I   1 byte
                        enable/dead/skip        I  96 byte 
                                                   --------
                        total (360 TDCs)           36K bytes

note:  I believe TDC FRAM data will be stored in a separate 
       database at the University of Michigan and does not have
       to be part of the online database.
               

FE calibration (timing and dE/dx)
            per channel
                        superlayer              I   1 byte
                        wire(0-5760 in SL8)     I   2 bytes
                        timing slope            R   4 bytes
                        timing offset           R   4 bytes
                        dE/dx slope             R   4 bytes 
                        dE/dx offset            R   4 bytes
                        dE/dx nolinearity       R   4 bytes 
                                                   --------
                        total (34,650 channels)  797K bytes


High Voltage
            per channel
                         superlayer             I   1 byte
                         wire(0-24)             I   1 byte 
                         voltage                R   4 bytes 
                         current limit          R   4 bytes
                         v limit ?              R   4 bytes
                                                   --------
                         total (all*200)          2.8K bytes

note:  Need to check on V_limit, but likely not necessary.

Environment
                         temperature
                         pressure
                         drift gas mixture (e.g. Ar:Et 50:50, etc.)
                         drift gas flow rate
                         alcohol temperature

note:  Temperature and pressure will go into the event stream,
       although it is possible that we may want to archive some
       temperatures (e.g. cooling water temp?) in the database.
                         

Drift constants (Stage 0/Post 0)
                         global t0 
                         drift velocity
                         lorentz angle

Alignment
                         wire positions 

note:  Alignment is still a database issue for us, but is categorized
       under Level 3.