DSP_Blockset_Upgrades - david-macmahon/wiki_convert_test GitHub Wiki

This page gives information on upgrades to the CASPER library DSP blockset.

Completed

Current

• FFT optimization
  • Tasks completed :
    • Xblocked everything in casper_library_ffts
    • Cooperated upgraded butterfly in xBlock, and a few rough tests passed.
    • Bit growth functionality
    • Removed replicated counters in FFT stages

  • Outstanding tasks:
  • contact people: Hong Chen, Suraj Gowda

• update testing infrastructure
  • motivation : provide a useful infrastructure to help other upgrade efforts
  • commenced : July 2011
  • outstanding tasks :
    • add new FFT unit tests for when generating for Virtex-2 architecture
    • update existing unit tests for PFBs library section
    • update existing unit tests for Correlator library section
    • parse testing file to auto-populate drop-down boxes in Misc/test block
  • tasks completed :
    • unit tests updated for Misc library section
    • unit tests updated for FFTs library section
    • unit tests updated for Delays library section
    • unit tests updated for Downconverter library section
    • unit tests updated for Multipliers library section
  • contact person : Andrew Martens

Proposed

• reduce coefficient BRAM usage in pfb_fir
  • motivation : BRAM is often a limiting factor for applications requiring large FFTs. the PFB consumes are large proportion of these.
  • possible tasks :
    • current filter windows used in the pfb_fir are symmetrical. Use two address counters, one counting up and one down as address inputs to each port on a dual port RAM. Only half the number of coefficients need be stored.
    • store the coefficients for all taps in a single (or optionally more for performance-sensitive applications) BRAMs allowing higher BRAM efficiency.
    • store only one set (or optionally more for performance-sensitive applications) of coefficients and use these in more than one data-path.