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