SiPPCUser

H1 Silicon Tracker Power PC Hit Finding Routines

Version 2.1 Markus Kausch October 17, 1997

This document describes the code structure and the implementation of the ``User'' routines used for online data processing of the H1 Silicon strip detectors. Their task is to find the hits and to update the ``calibration constants'' periodically. During running they are called with every event by the main readout task. These routines are compiled separately from the main readout function and loaded to a fixed address in the PPC memory. The main routine then calls the the ``user'' task at that address.

Since the actual hitfinding strategies and algorithms for the different ``subdetectors'' of the H1 Silicon branch (that is CST, BST, and - in the near future - VLQ) are different, a common framework has been developped, which is layered between the main readout function and the specific routines.

In section 1 general remarks on the Silicon readout are made and the common framework is described. Section 2 describes the Routines for the CST, section 3 those for the BST.

For general information about the Silicon PowerPC data acquisition and about the main readout task refer to the manuals:

W.J.Haynes, SiPPCvmexi_SSP, H1 Silicon Tracker Power PC Readout - VMEtaxi Mark-2 System Software Package.
W.J.Haynes, SiVMExi, H1 Silicon Trackers: VMEtaxi Data Acquisition.

!! WORKING DOCUMENT - SUBJECT TO MODIFICATION !!

• Contents
• 1 Silicon Hit Finding on the PowerPC boards: the framework
  • 1.1 Hardware
  • 1.2 Data flow
  • 1.3 Memory
  • 1.4 Readout options
    • 1.4.1 Modes
    • 1.4.2 Power PC masks
    • 1.4.3 Other options and parameters
  • 1.5 Data formats
    • 1.5.1 Raw data
    • 1.5.2 PPC-formatted data
    • 1.5.3 Constants
  • 1.6 Compiling and loading code
  • 1.7 Main User Routine
• 2 Routines for the CST
  • 2.1 Data Formats
    • 2.1.1 PPC output
    • 2.1.2 Pedestals & Sigmas
  • 2.2 Initialization
  • 2.3 Hit Finding
    • 2.3.1 Handling Special Voltages
  • 2.4 Constant Updating
• 3 Routines for the BST
• A BOS Bank Formats
  • A.1 Front End banks
  • A.2 CST Reconstruction banks
  • A.3 BST reconstruction banks
• B List of Subroutines
  • B.1 CST
• References
• About this document ...