Trigger Control Computer (TCC)

• TCC = Interface between hardware and rest of experiment

           for Programming, Monitoring, and Testing
 
• No involvment in trigger decision (132 ns)

No involvment in readout mechanism or content (100 us)
 
• Windows NT PC

Visual C++

•  Bus Adapter for interface to crates of electronics

 
• Bit3 PCI to VME

   ~3 us per VME access for memory mapped
   ~30 us per individual call to Bit3 API
 
• One Bus Adapter in TCC per target VME Crate

    with bit3 PCI expansion backplane
   cf. www.pa.msu.edu/hep/d0/ftp/tcc/vme_access/tcc_to_l2_trigger_communication.txt
 
• Or tiered set of adapter, one in TCC

     with bit3 VME to VME Bus Adapters
     or Fermi built Vertical Interconnects
    cf. www.pa.msu.edu/hep/d0/ftp/tcc/vme_access/vme_communication_crate.txt