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Track Lists in Level 2

Track Lists in Level 2. Outputs from SLAM provide lists of tracks faster than the current path to SVT and Level 2 via XTRP Sparsify lists of tracks based on L1 bits Other applications: Sparsify list of segments passed to Level 2 Barrel pointer for SVT Specification draft:

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Track Lists in Level 2

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  1. Track Lists in Level 2 • Outputs from SLAM provide lists of tracks faster than the current path to SVT and Level 2 via XTRP • Sparsify lists of tracks based on L1 bits • Other applications: • Sparsify list of segments passed to Level 2 • Barrel pointer for SVT • Specification draft: http://www.physics.purdue.edu/~mjones/xft/ttl2_Nov10_2005.ps M Jones

  2. Level 1/Level 2 XFT Interfaces • Two main functionalities, each implemented using 3 Pulsar boards: • Segment List: concatenate segments from stereo finders and send to Level 2 • Track List: concatenate tracks from SLAM boards and send to various places • Connected together as shown... M Jones

  3. It might be easier to look at the draft of the note... M Jones

  4. Track List path to Level 2 • Track List Pulsars receive tracks from SLAM modules • Sparsify based on Level 1 trigger bits • If no subsequent path requires lower pT tracks, don’t bother to send them to Level 2. • Order tracks by φ, send to Level 2 merger • Level 2 merger sends complete list, ordered by φ, to Level 2 using S-Link. • How much faster is this? M Jones

  5. Track List path to SVT • Similar to previous path to Level 2... • Track List Pulsars receive tracks from SLAM modules • Sparsify based on Level 1 trigger bits • Order tracks by φ, send to SVT mergers using SVT cables and data format • How much faster is this? M Jones

  6. Track List path for Barrel Pointer • SLAM modules set bits corresponding to candidate SVX-II half barrels • OR all masks from tracks selected based on Level 1 trigger bits • Pass the resulting 6-bits per phi wedge to SVT by some convenient means, eg., copper serial link • Possible performance still a bit unclear but can only improve on what we have now M Jones

  7. Track List to Segment List Pulsars • One possible algorithm: • Sparsify tracks based on Level 1 trigger bits • For each track selected, set a bit for each possible stereo pixel in its road • Pass the resulting pixel masks to the Segment List Pulsars • Segment List Pulsars only send pixels in masked regions to Level 2 M Jones

  8. Implementation • Main prerequisite is the list of tracks out of SLAM • Good enough to start with axial XFT tracks with SLAM operating as Linker Output Module • Stereo confirmation with full SLAM implementation comes for free • Need to provide lots of information in L2 buffers for commissioning/diagnostics • Natural to implement in incremental stages M Jones

  9. Summary • Please send comments or suggestions on the draft of the specification • Should plan to distribute widely later this week. M Jones

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