madscifi

Members
  • Content count

    2
  • Joined

  • Last visited

Community Reputation

0 Neutral

About madscifi

  • Rank
    Newbie

Profile Information

  • Gender
    Not Telling
  1. madscifi

    16-Bit I/O Buffer Wing Issue

    Anything with a chip labelled CB3Q16245 will not work correctly. Based on the spec sheet I believe that boards with the IDT chip will also fail, but I don't have a board with that chip to test and so it is possible I'm wrong about that. This issue only affects the 16-Bit I/O Buffer Wing boards. The Logic Sniffer 16-bit Input Buffer Wing is not affected. If someone can test one of the boards with the IDT chips, please make certain the board is not attached to a Papillo or OLS (or any other device) when the test is made - the internal diodes on the pins of the Xilinx chip will confuse the issue.
  2. madscifi

    16-Bit I/O Buffer Wing Issue

    I just tested a 16-Bit I/O Buffer Wing that I purchased from LinkSprite and it does not appear to limit the pass-through voltage to 3.3 volts. Test procedure (number in parentheses is the actual meter readings): 3.3 (3.297) volts/ground connected to the 3.3 volt and ground power connectors. A volt meter was connected from pin A16 (pin 26 on the chip) to ground. 3.3 (3.297) volts was applied to JP7 pin 8 (pin 23 on the chip, labeled as 15 on the board). 3.3 (3.297) volts was shown on the volt meter. 5 (4.73) volts was applied to JP7 pin 8 (pin 23 on the chip, labeled as 15 on the board). 5 (4.73) volts was shown on the volt meter. Is there something I'm doing wrong? (Full disclosure - I've exchanged emails with Gadget Factory in the past about this board because I had concerns about the chip used on this board, but the board was out of stock at the time so I was unable to test an actual board at that time.)