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Author Topic: Eprom 27c256 D0-D7 data waveform  (Read 534 times)

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Offline DaxxinTopic starter

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Eprom 27c256 D0-D7 data waveform
« on: April 24, 2019, 08:14:42 am »
looking with scope at the data D0-7 i get this shape ..thats a valid data , garbage , freerunning , Z-state ?

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Offline bson

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Re: Eprom 27c256 D0-D7 data waveform
« Reply #1 on: April 24, 2019, 08:15:40 pm »
Check where you attached the probe's ground clip... this looks a lot like you don't have a good signal reference.
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Online T3sl4co1l

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Re: Eprom 27c256 D0-D7 data waveform
« Reply #2 on: April 24, 2019, 09:11:34 pm »
Also, make sure probe is on 10x setting, and scope is >= 20MHz.

Tim
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Online Ian.M

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Re: Eprom 27c256 D0-D7 data waveform
« Reply #3 on: April 24, 2019, 10:30:47 pm »
... 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
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