FEM card function

data mode:
- fans out & xmits beam clock, level 1 trigger, reset & resync signals to ROCs
- xfers event fifo contents from DMUs as required & verifies integrity via parity check
- xforms 45 DMU serial streams to parallel stream for FEM data formatter
- formats, tags and packetizes event data for xfer to DCM
control & set-up mode:
- xmits serial data to individual TGLDx chips for channel enable/disable, calibrate level , calibrate pulse & multiplex analog signal out address
- reports mode and status information