Experimental Physics and
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Hi Lin,
How is everything at CSNS?
That is good that you did get a chance to have a simple test.
During your test, did you observe any jitter issue?
Were you able to turn on and off the delay compensation function smoothly?
Or do you have to go with a work around solution, for example leaving the compensation function on and putting zero delay there?
When you disable the delay compensation, how about the signal quality? Any performance issue?
Thanks,
Guobao
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From: Wang, Lin <wanglin at ihep.ac.cn>
Sent: Tuesday, February 18, 2020 7:59:54 PM To: Shen, Guobao <gshen at anl.gov> Cc: tech-talk <tech-talk at aps.anl.gov> Subject: Re: MRF Delay Compensation Function Hi Guobao, In 2018, in the task of event timing system prototype of the HEPS-TF project, I built a test stand with MRF VME-EVM-300 and VME-EVR-300, and did a simple test of the delay compensation function.
Hardware platform: MVME-5100 VME-EVM-300 VME-EVR-300
Software platform: Debian 8.7 32-bit running in VirtualBox vxWorks 6.8 PSI fork of mrfioc2 [1] EPICS-3.14.12.3 devlib2-2.8
The caQtDM OPI (included in mrfioc2) developed by PSI was very straightforward and contained everything I wanted. I enabled the delay compensation mode in both VME-EVM-300 and VME-EVR-300 as well as some other configurations, and set a appropriate delay compensation target value to VME-EVR-300, then the internal FIFO in VME-EVR-300 did the compensation.
Actually, the only test I did was switching optical fiber from 3 meter to 6 meter, and it turned out that the compensation function worked properly. Due to my work assignment, I did not do any further test since then. Shortly, I will send you a memo document written in Chinese which records my test procedure.
Regards, Lin
[1] https://github.com/paulscherrerinstitute/mrfioc2
-----Original Messages-----
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ANJ, 19 Feb 2020 |
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