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AR# 41135

LogiCORE IP Image Statistics v2.0 - Why are the power, sum, min, max, hifreq, lofreq and edge signals not resetting after READOUT is deasserted?

Description

Why are the power, sum, min, max, hifreq, lofreq and edge signals and all the outputs except the histograms outputs not resetting after a READOUT is deasserted?

Solution

This is a known bug in the Image Statistics v2.0 release that is fixed in the Image Statistics v3.0.

Expected Usage:

  • Typically, you are expected to assert the READOUT flag, then wait for the DONE flag to come high.
  • At this point, you can read out the statistical information.
  • When you have completed the readout, you can deassert the READOUT.
  • After this, the core enters the clear_rams phase, but due toa bug, the sum, pow, min, max, hifreq, lofreq,edge, and so on are not reset.

Workaround:

  • Youcan work around this issue by waiting for another frame, for example, the core cycles through an acquisition => clear_rams transition.
  • The signals in question will then transition to zero, and you can assert theREADOUT again and resume statistics collection.

Additional Information:

(Xilinx Answer 33748) - List of LogiCORE IP Image Statistics Release Notes and Known Issues.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
33748 LogiCORE IP Image Statistics - Release Notes and Known Issues N/A N/A

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
33748 LogiCORE IP Image Statistics - Release Notes and Known Issues N/A N/A
AR# 41135
Date Created 10/25/2011
Last Updated 12/15/2012
Status Active
Type General Article
IP
  • Image Statistics Engine