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Entry  Mon Aug 29 09:36:34 2016, benjamin legeyt, increment write config register on the fly? 
    Reply  Mon Aug 29 10:57:33 2016, Stefan Ritt, increment write config register on the fly? 
       Reply  Mon Aug 29 12:18:49 2016, benjamin legeyt, increment write config register on the fly? 
          Reply  Mon Aug 29 12:51:48 2016, Stefan Ritt, increment write config register on the fly? 
Message ID: 534     Entry time: Mon Aug 29 10:57:33 2016     In reply to: 533     Reply to this: 535
Author: Stefan Ritt 
Subject: increment write config register on the fly? 

The issue with "stopping at cell 767" would also affect this mode of operation. Furthermore, the DRS4 chip has only 10 bit register which records in which cell the event has occured, and where the readout must be started. If you record 8 separate events, you don't know where to start the readout.

The DRS5 chip will have all this possibilitied, but unfortunately it won't be ready before 2-3 years from now.

Stefan

 

benjamin legeyt wrote:

Hello,

I have a question about using the write config register to enable/disable sampling on the fly.  I am looking to instrument an experiment at EPFL where multiple short events need to be captured during a 20us period followed by an 80us quiet period during which we could read out the chip.  Would it be possible to start an acquisition with all channels seeing the same signal and the write config register set to 111111111 and then shift a zero into the write config reg after each event is detected to freeze the channels in time one-by-one?  In this way we could measure up to 8 different events during the active period and then read them all out together during the quiet period.  I have read the posts about the simultaneous read-write mode and the issue with waveforms stopping at cell 767.  not knowing the exact details of what causes this issue I wonder if it would effect this sort of operation?  Also, I would like to know if dwrite must be de-asserted while the write config register is being updated or if it could be done while the sampling is active?  The latter would obviously be preferable as we would not incur any dead-time during the active period.

Thanks in advance for the information,

Benjamin LeGeyt

 

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