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Entry  Thu Mar 4 19:14:10 2010, Hao Huan, Readout of DRS Data 
    Reply  Fri Mar 5 23:29:04 2010, Hao Huan, Readout of DRS Data 
    Reply  Thu Mar 11 11:45:52 2010, Stefan Ritt, Readout of DRS Data 
Message ID: 49     Entry time: Fri Mar 5 23:29:04 2010     In reply to: 48
Author: Hao Huan 
Subject: Readout of DRS Data 

Hao Huan wrote:

Hi Stefan,

    thanks to your help I can now successfully keep the Domino wave running at a stable frequency and maintain the channel cascading information in the Write Shift Register. (Since you told me WSR always reads and writes at the same time, I think I need to rewrite the information back every time after reading out from WSR to decide from which channel my data come, don't I?)

    However I'm still having difficulty in reading out from the DRS cells. I use the ROI readout mode and assume as long as I give a pulse on RSRLOAD the data will come out one by one. However, what I get is just a constant with some noise, which seems I'm always reading from the same cell. Actually I'm not very clear about how it works. What's the mechanism for RSRLOAD  and do I have to initialize the Read Shift Register to use the ROI mode? Also I read in the datasheet that WSROUT will give RSR output when DWRITE is low. Sometimes I see some random bits from this output and sometimes I see all zero's. What is the reasonable output I should see from WSROUT, say, when I'm running in the transparent mode with DWRITE low?

    Thank you very much!


Hi Stefan,

    I tried again and confirmed the problem... In the full readout mode I could successfully read out all the data, but in the ROI mode if I naively apply a pulse at RSRLOAD the results are not right. Is there anything I should be careful about in the ROI readout mode?



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