Current test set-up

1. Current test set-up Access VME with SBS620 PCI-VME link Throttle signals from FED to FT FT (slave) Clock & L1As from FT to FED FT (slave) FT (slave) PC with PCI-X slots FT (master) J1 Connector J2 Connector Simulate Local Trigger Control System Merge 96 fibres into 8 ribbons of 12 fibres SBS VME-PCI Card J0 Connector Generic PCI Card Slink-Tx Slink Rx LVDS cable FED LECC2004: Performance of the CMS Silicon Tracker FED: Greg Iles

2. TTC System Version 1 TTC Optical Distribution Clk Clk TTCvi TTCex FT Master Trigger Control System FED L1A Chan A Attenuation or fan-out BC0 3xBGo Chan B FED L1Reset Pipe Valid FED FED FT Slave FT can drive 4 NIM/ECL channels Do we need it to drive more? What about: - Event Counter Reset - Orbit Counter Reset TTCvi has 4xBGo + 1xL1A inputs FED FT Slave Clk and Control FED FT Slave FED FT Slave LECC2004: Performance of the CMS Silicon Tracker FED: Greg Iles

3. TTC System Version 2 Clk TTC Optical Distribution Clk TTCvi TTCex FT Master Trigger Control System FED L1A Chan A Attenuation or fan-out BC0 2xBGo Chan B FED L1Reset FED Difference compared with TTC v1 FT clk supplied by TTCex TTCvi clk supplied by FT Only drive 2 BGo inputs. What about - Event Counter Reset - Orbit Counter Reset - Pipe Valid FED FT Slave FED FT Slave Clk and Control FED FT Slave FED FT Slave LECC2004: Performance of the CMS Silicon Tracker FED: Greg Iles

4. Status & Plans • Done • James has written TTCvi software interface • FT firmware upgraded • New daughter card design complete • Pending • Workshop to layout and manufacture daughter card. At least another week before we get it back. A problem ? LECC2004: Performance of the CMS Silicon Tracker FED: Greg Iles