Eprom 27c256 D0-D7 data waveform

• Eprom 27c256 D0-D7 data waveform
  Posted by Daxxin on 24 Apr, 2019 08:14
• looking with scope at the data D0-7 i get this shape ..thats a valid data , garbage , freerunning , Z-state ?
  
  
• #1 Reply
  Posted by bson on 24 Apr, 2019 20:15
• Check where you attached the probe's ground clip... this looks a lot like you don't have a good signal reference.
  
• #2 Reply
  Posted by T3sl4co1l on 24 Apr, 2019 21:11
• Also, make sure probe is on 10x setting, and scope is >= 20MHz.
  
  Tim
• #3 Reply
  Posted by Ian.M on 24 Apr, 2019 22:30
• ... and that the x10 probe's compensation adjustment is set up correctly for the flattest possible tops/bottoms on the scope's test signal with no visible over/undershoot on the edges