Forum Discussion

LBart15's avatar
LBart15
Icon for New Contributor rankNew Contributor
5 years ago

Altera USB Blaster Presence Detection

I would like to know if there is a way to detect the presence of the USB Blaster on a board. I need to detect it to disable (Tri-State with buffer) another JTAG bus signal to avoid concurrent access to the bus.

  1. Is there any signal driven by the USB Blaster that can be used to getting knowledge of its presence?
  2. Are the two GND connected together internally (so i can use one of this pulled-up to get the information)?
  3. Is a schematic of USB Blaster available?

Thanks a lot

Best Regards

Lorenzo

3 Replies

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi Lorenzo,

    May i know what is the device that you are using so that i can share you the development kit schematic that we have for your reference?

    I think there is no way to detect that as the signal waveform needed to send on the 10 pin in the circuit board header is the same. Unless you have a controller connected to the 2 JTAG and that might be able to prevent concurrent on that.

    Thank You.

    Regards,

    Bruce

  • LBart15's avatar
    LBart15
    Icon for New Contributor rankNew Contributor
    5 years ago

    Hi Bruce,

    I am using a MAX II, but I need the schematic of the USB Blaster to understand how it is possible to detect its presence and .

    However could you please answer to question N. 2?

    Thanks a lot.

    Regards

    Lorenzo

  • YuanLi_S_Intel's avatar
    YuanLi_S_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Hi Lorenzo,

    Yes, GND are connected together. Apologize that we do not have schematic for USB Blaster.

    Thank You