 Tue Jan 12 16:06:07 2016, Stefan Ritt, Use of Channel Cascading in drs_exam.cpp
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Hi Larry,
sorry my late reply, swamped with work here. You were right in the modifictions you did, congrats. The speed limitation of 500 events come from
USB2, which simply is not fast enough. The 500 Hz are mentioned on the evaluation board web site, so you should have seen that before ordering. Some people |
 Wed Apr 7 03:29:39 2021, Sean Quinn, Unexpected noise in muxout: t_samp related? 
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Dear DRS4 team,
I'm experiencing some issues that seem to be isolated to the ASIC, and would like to understand if we are doing something wrong. There are
several items to address in the post. |
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Wed Apr 7 08:26:12 2021, Stefan Ritt, Unexpected noise in muxout: t_samp related?
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Dear Sean,
noise in transparent mode comes from some coupling to your system clock. But 3.5 mV RMS seems rather hight to me. You should get it to below
1 mV if the DRS4 input is clean (try to short it). |
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Fri Apr 9 20:22:13 2021, Sean Quinn, Unexpected noise in muxout: t_samp related?
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Hi Stefan,
Thanks much for the quick reply. Ok, yes, things do seem ok after the offset calibration. I am running into some other issues I could use your |
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Fri Apr 9 20:55:28 2021, Stefan Ritt, Unexpected noise in muxout: t_samp related?
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If you do the cell calibration correctly, your noise should be ~0.4 mV. You seem to be 2-3x larger. The periodic negative spikes come if you dont'
sample at the right time. Adjust t_samp until they are gone.
Stefan |
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Fri Apr 9 21:56:54 2021, Sean Quinn, Unexpected noise in muxout: t_samp related?
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Yes, there is some systematic board noise on this prototype, unfortunately
Ok, then it seems the other post I made might still belong in this thread after all. |
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Mon Aug 18 06:52:51 2025, Jonathan Bradshaw, Unexpected behaviour following RSRLOAD
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Hello
I'm working to bring up a new capture board using a DRS4 and I'm having a minor problem and a major problem.
Minor problem: if I send a reset signal into the DRS4, the PLL doesn't work right. If I leave NRSESET pin with a wek pullup (and never |
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Tue Aug 19 02:40:58 2025, Jonathan Bradshaw, Unexpected behaviour following RSRLOAD 6x
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Some images
Notes:
top of the puicture shows the logic channels
Red: SRCLK
Blue: SRIN
Green: SROUT
Orange: normally |
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Tue Aug 19 23:10:30 2025, Jonathan Bradshaw, Unexpected behaviour following RSRLOAD
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Turns out it was a damaged DRS4 IC.
I ported the drs4_eval5_app code onto our board and observed much the same misbehaviour. So I bit the bullet and replaced the DRS4 IC,
and things are going better. |
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Mon Mar 23 15:03:28 2020, Ajay Krishnamurthy, USB trigger issue
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Hello,
I had forgotten to disable the turn off the power to the USB drive on Windows and DRS4 stopped triggering. Now, we are all on quarantine and
I am unable to reset the board to normal function. Are there any commands to reset the board remotely. I tried all of the default Windows based solutions |
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Tue Sep 10 10:31:30 2013, Akira Okumura, USB connection stops
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Hello the DRS4 team,
I and some of my colleagues are using DRS4 evaluation boards (ver. 3) for the R&D of the Cherenkov Telescope Array project. During
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Wed Sep 11 02:41:28 2013, Andrey Kuznetsov, USB connection stops
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Hi,
although I don't have a chance to test your code, it looks very similar to what I am using.
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Wed Sep 25 14:42:00 2013, Akira Okumura, USB connection stops
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Hello Andrey,
Thank you for your advise. But we never terminated the program before closing and deleting the DRS object. What we did was just executing the program multiple |
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Wed Jan 15 15:48:55 2014, Stefan Ritt, USB connection stops
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Hi,
finally I found some time to look into this problem, sorry for the late delay.
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Tue Oct 7 14:09:02 2014, Stephane Debieux, USB Microcontroller firmware
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Hi,
I'm trying to recompile the USB microcontroller firmware starting from the drs_eval.c file but I'm not able to get a .iic file close to the one
provided with the eval board. It seems to me that this drs_eval.iic file does not match the drs_eval.c and drs_eval.hex files or that I'm doing something |
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Mon Oct 13 16:46:56 2014, Stefan Ritt, USB Microcontroller firmware
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Stephane Debieux wrote:
Hi, |
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Mon Oct 13 17:08:40 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Mon Oct 13 17:14:58 2014, Stefan Ritt, USB Microcontroller firmware
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Stephane Debieux wrote:
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Tue Oct 14 16:21:07 2014, Stephane Debieux, USB Microcontroller firmware
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Stefan Ritt wrote:
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Tue Oct 14 16:29:12 2014, Stefan Ritt, USB Microcontroller firmware
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Stephane Debieux wrote:
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