Author Topic: RIGOL MSO5000 Parallel Decode issues  (Read 693 times)

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Offline JetForMeTopic starter

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RIGOL MSO5000 Parallel Decode issues
« on: December 08, 2022, 12:15:04 am »
I recently got a Rigol MSO5074 and did all the hacks to fully upgrade it. So far so good.

Last night I was working on troubleshooting a serial-to-parallel shift register circuit, and used the scopes D8-D15 channels to view the shifted data. The output is a simple 8-bit value that increments by one each iteration. The data line traces show the correct value, but the decoder sets every other MSB bit high. I have the decoder configured to decode on the falling edge of RCK

Here’s a wider view (annoyingly, if you zoom in too far, the Rigol won’t show the decoded values) for context:

(Huh, i can't figure out how to get an inline thumbnail for the attached images. Image "12.png")

Here it is zoomed in. The bitstream shown is 0b01010011, as shown by the AX cursor value in the lower-right. But the decoded value (as seen on the zoomed-out view above) is 0xD3.

(Image "13.png")

As far as I can tell, this is just a bug in the Rigol, but perhaps there’s something else going on with the signaling that I'm misunderstanding?

Also, you can configure "Bit X" and "CH" when setting up the Decoder, but the manual doesn’t explain what those are. Does anyone know?
« Last Edit: December 08, 2022, 12:16:40 am by JetForMe »
 

Offline thm_w

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Re: RIGOL MSO5000 Parallel Decode issues
« Reply #1 on: December 08, 2022, 01:18:20 am »
Yeah don't worry about the inline, its a bug, you can fix it if you really want but I don't think its needed: https://www.eevblog.com/forum/blog/inserting-attached-images-inline/msg3692618/

BITX and CH are described in the users guide: https://www.batterfly.com/PDF/RIGOL/mso5000/MSO5000_UserGuide_EN.pdf
if you want to trigger off a specific bit.

Did you zoom in more to see if there are no glitches when RCK falling edge occurs? Maybe check that channel with an analog channel measurement as well, to make sure its not doing anything weird.

I would also consider buying a $10 saleaea clone, if you prefer debugging on the PC.
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