DAQ Motherboard (DMB)
The DMB serves as a link to the
central DAQ of CMS. There is one DMB for each CSC module.
The readout of the data from each CFEB is initiated by the DMB.
The bits that indicate which of the CFEB boards
contain SCA-stored analog data are received from the TMB
board and passed back to the CFEB.
Digitization of the SCA samples will begin on the CFEB's if the bit(s) are
time-correlated with the Level-1 accept.
The stored samples
within a time window of 400 ns for all channels on the CFEB are
digitized. The digitized data is sent to the FIFO to the DMB
and transfered by optical link to the central DAQ.
Click here for a detailed descrition of the Data Acquisistion Process.
The DMB also act as interface to Slow control. The interfaced
functions include downloading of the FPGA and DSP
programs, resetting of the readout controller on the CFEB's, downloading
calibration information, downloading commands for turnning off bad channels,
monitoring of low voltage levels and temperature.
JTAG will be used for the slow control.