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  1. Hi @jpeyron, Thanks for your reply. The master generating the serial signals in the images is an i.MX6 ARM CPU. I'm away from my desk right now so I can't verify, but could it simply be that I've managed to disconnect the ground connection between the Digital Discovery and the board without noticing? Would a missing gnd connection result in signal behavior like what I'm seeing? Thanks, Staale
  2. Getting acquainted with WaveForms and my new Digital Discovery. I'm looking at SPI signals and see gray blocks in the signal plots. (See enclosed images.) What is the significance of these blocks? Too fast oscillation vs sampling rate? However, mouse-over doesn't show any change in values across the block. Sorry if this is an obvious question. Thanks for any input. Staale Overview: Same grid, max zoom: