DFE as FRC Issues

1
DFE as FRC Issues

• D8 Transfers An Annoyance
• Transfers over VME
• Monitoring Regs to FRC
• L3 Buffer Units to VBD
• Configuration Download (minor for FRC)
• LVDS OK
• Remember
• L1CTT Local STT Trk No. ? 40 bits / trk
• SLC Info ? 40 bits
• SCL Receiver Some Work
• SCL Mezzanine not compatible w/ DFE Daughterboard
• Need to Design a New Board for SCL Receiver
• Intra-FRC Comm. Split FRC
• Only issue is SCL information
• SCL ? Road, Buffer-Ctrl, FRC-Ctrl Units
• Use Separate Boards for SCL-Rec FRC
• Minimal Impact system is modular

2
Possible DFE-FRC System

• Card 1 SCLR custom
• Basically SCL Mezzanine Support
• Lots of DØ examples
• Card 2 FRC DFE
• Daughterboards Required
• Control / Status Unit
• Road Unit
• Buffer Control Unit
• L3 Buffer Unit (STT-wide)
• Communication
• SCLR ? FRC LVDS
• FRC ? SCLR User Pin
• INIT-ACK, L1/L2_BUSY, L1/L2_ERROR
• Open Questions
• Is D8 enough for VBD Transfers ?
• Note VBD is supposed to handle D8 - but not
  apparent from doc