Conceptual design
(Marvin Johnson March 1997)

1/6 of detector in one crate

• 1 CFT input card
  • handles 14 CFT sectors (wedge of 60 degrees)
  • puts track candidates on bus (max. 16 tracks per 60 degree wedge)
• 9 processor cards
  each handles SVX data from 4 HDI's;
  tasks:
  • SVX cluster finding
  • identify hits which are in CFT road
  • map to physical coordinates
  • put on VME bus
• 1 DSP card
  compute track parameters

total cost about 660k$ (880 k$ for no-crack design)

Time budget

start at L1 accept:

 
		 task  		    time (microseconds)
	

	CFT tracks on J3 bus  	     0.3

	SVX read-out   		     7

	hitfinding during read-out   0

        put data via VME into DSP   15

	compute track parameters    18

	transfer to global L2  	    10

	total  		            50