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## Hardware
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### Q: does the board comply to CE regulations (EMC)?
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A: Yes it does. In June 2012 extensive EMC tests have been performed on
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the SPEC with a digital I/O (FMCDIO5chTTLa) card. These tests have been
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made by [AT4 wireless](http://www.at4wireless.com/), a testing
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laboratory accredited by the Spanish National Accreditation Body (ENAC
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-Entidad Nacional de Acreditación) to perform the tests indicated in the
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Certificate No. 51/LE 203.
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The [test report](https://www.ohwr.org/project/spec/wikis/Documents/EMC-Test-report) is publicly
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available and shows that the card has passed the most restrictive EMC
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tests of each class (domestic and industrial) successfully:
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- EM Radiated Emission: Class B (Domestic) EN 55022 (2006) / A1 (2007)
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- EM Immunity (Industrial): EN 61000-4-3 (2006) / A1 (2008) / A2
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(2010), EN 61000-4-4 (2004) / A1 (2010) / Corr (2010), EN 61000-4-6
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(2009), EN 61000-4-2 (2009), EN 61000-4-8 (2010).
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### Q: What are the differences between V1-0, V1-1 and V2-0?
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A: V1-0 and V1-1 have different output buffers (SN74LS125 vs SN74LVT125)
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caused by a mistake in the PCB library and resulting in poor output
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pulse rise time and inability to drive 50 ohm loads in V1-0. V2-0 has
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improved I/O protection circuit which works also when the card is not
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powered. V1-0/V1-1 PCB designs are identical, in order to identify the
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version, check the types of buffers soldered (IC2,
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IC5).
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### Q: My card seems to be missing IPMI FRU information in the EEPROM. Can it be fixed?
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A: Many cards miss that information, as it was not supported by the DIO
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PTS (Production Test System). A temporary procedure to fix this issue
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goes as follows:
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\- Make sure you're using the latest master of the SVEC/SPEC drivers.
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\- Download the
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[eeprom-dio.bin](https://www.ohwr.org/project/fmc-dio-5chttla/uploads/c4a017de2b47c61102aea23afd729435/eeprom-dio.bin)
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file from the Files section.
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\- Load the SPEC/SVEC driver and the golden bitstream
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\- Program the EEPROM with the command (as root, replace XXXX with the
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ID of the mezzanine):
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cat eeprom-dio.bin > /sys/bus/fmc/devices/fmc-XXXX/eeprom
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\- Reload the driver. Now it should enumerate the card correctly:
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svec svec.0: mezzanine 0
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Manufacturer: CERN
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Product name: FmcDIO5chTTLa
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-----
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Tomasz Wlostowski - 1 July 2014
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### Q: Does it work?
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A: No, not yet. The files current posted (as of 14/09/15) are for our
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version 1 prototype which has a number of known bugs/issues:
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including - readout speed issues with the Raspberry Pi (we're using
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interrupts that don't go fast enough under standard Raspian), an
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unintentional hard limit for the event detection rate of 1 Hz as a
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result of the way the high precision timing is implemented, and some
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issues with the ADC's - specifically they're not configured to caputre
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in the correct way and aren't pipelined. Finally, the rather neat Murata
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HV PSU we've integrated isn't sufficiently stable (too much noise) for
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use with our preference of Hammamatsu SiPMT. We're addressing all these
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issues (and more) for version 2\!
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### Q: What about the detector medium?
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A: Version 1 is based on using a pair of Hammamatsu SiPMT's, a block of
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plastic scintillator and a wavelength shifting fibre. All these items
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are commercially available from people like Saint Gobain.
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\---
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James Devine 14/09/15
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