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FAQ

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Frequently Asked Questions¶

Hardware¶

Q: does the board comply to CE regulations (EMC)?¶

A: Yes it does. In June 2012 extensive EMC tests have been performed on the SPEC with a digital I/O (FMCDIO5chTTLa) card. These tests have been made by AT4 wireless, a testing laboratory accredited by the Spanish National Accreditation Body (ENAC -Entidad Nacional de Acreditación) to perform the tests indicated in the Certificate No. 51/LE 203.
The test report is publicly available and shows that the card has passed the most restrictive EMC tests of each class (domestic and industrial) successfully:
  • EM Radiated Emission: Class B (Domestic) EN 55022 (2006) / A1 (2007)
  • EM Immunity (Industrial): EN 61000-4-3 (2006) / A1 (2008) / A2 (2010), EN 61000-4-4 (2004) / A1 (2010) / Corr (2010), EN 61000-4-6 (2009), EN 61000-4-2 (2009), EN 61000-4-8 (2010).

Q: What are the differences between V1-0, V1-1 and V2-0?¶

A: V1-0 and V1-1 have different output buffers (SN74LS125 vs SN74LVT125) caused by a mistake in the PCB library and resulting in poor output pulse rise time and inability to drive 50 ohm loads in V1-0. V2-0 has improved I/O protection circuit which works also when the card is not powered. V1-0/V1-1 PCB designs are identical, in order to identify the version, check the types of buffers soldered (IC2, IC5).

Q: My card seems to be missing IPMI FRU information in the EEPROM. Can it be fixed?¶

A: Many cards miss that information, as it was not supported by the DIO PTS (Production Test System). A temporary procedure to fix this issue goes as follows:
- Make sure you're using the latest master of the SVEC/SPEC drivers.
- Download the eeprom-dio.bin file from the Files section.
- Load the SPEC/SVEC driver and the golden bitstream
- Program the EEPROM with the command (as root, replace XXXX with the ID of the mezzanine):

cat eeprom-dio.bin > /sys/bus/fmc/devices/fmc-XXXX/eeprom

- Reload the driver. Now it should enumerate the card correctly:

svec svec.0: mezzanine 0
      Manufacturer: CERN
      Product name: FmcDIO5chTTLa

Tomasz Wlostowski - 1 July 2014

 
 
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