1. “CHEF board” Gianluca Lamanna & Riccardo Fantechi (CERN) TDAQ meeting 28.3.2012

2. Choke/error Choke/ErrorL0TPThe Choke/Error lines are used to inform the L0TP of busy or error condition in the readout. L0TPThe L0TP: –Stop –Stop the triggers requests “false” –Wait until the choke/error condition become “false” “re-start” –Notify to the readout boards the “re-start” using a special trigger R/O boardsThe R/O boards choke“almost full” “faulty” –Send a choke if the buffers are “almost full” or if they are approaching a “faulty” condition: in principle the acquisition could be recovered error“full” “bad” –Send an error if the buffers are “full” or if there is some problem: the burst should be define “bad” choke/error LVDS pair L0TPEach detector have to send only one choke/error LVDS pair to the L0TP

3. Choke/error network “OR” R/OAn “OR” board is needed to merge the information coming from the R/O L0TPR/O OR CAT7The CAT7 cabling is already designed to include the “internal” lines for the detectors in daisy chains

4. CHEF board for LKr CHoke and Error Fan in VME 6UVME 6U board for LKr 8 inputs3 outputs8 inputs, 3 outputs (one common output, two 4 channels output) LVDSCAT7 RJ45LVDS input and output on CAT7 RJ45 cables (pins 4-5 (choke) and 6-3 (error)) Very simple board: no recording or propagation of the input line status. VMENo VME control.

5. CHEF Board: schematic DS90LV048 DS90LV047ATM 5V->3.3V RJ45 74HC32

6. CHEF Board: Layout PRELIMINARY

7. CHEF Board other detectorsThe same board should be used for other detectors LAV CEDAR, STRAW, RICH, MUV, LKrLAV (already in 2012), CEDAR, STRAW, RICH, MUV, LKr Standalone 1UStandalone 1U format for the other detectors Difficulttoo expensiveno elegant 6U9U TEL62Difficult/too expensive/no elegant to adapt the 6U to 9U TEL62 external power supplySmall modification to the 6U (external power supply) crate Patch panel CHEF