Why to replace 1872s/1875s ?
¥Big conversion time: 10usec+2.5usec/hit is main contributor to CLAS front end busy time
¥Conversion time depends on occupancy
¥Slow readout: block readout is not supported; all remaining FASTBUS boards in CLAS support 64-bit single block readout
¥There is no headers in output data: slower data processing
¥ÒCommon startÓ mode only; delay cables are needed
¥Maintenance problems