Am 01/17/2012 12:59 PM, schrieb jana1...@centrum.cz:
> So I found out TCK,TMS,TDO,TDI and RST signals on the JTAG connector
> on my PCB.
> The datasheet for the BCM7401 says the values for these are 3.3V.
> But I can not find Vcc/Vref on JTAG.
> Where should lead that Vcc/Vref from that JTAG connector on PCB?
> Directly to CPU?
> And what values should be ?Also 3.3V or lower?
Those are used by the JTAG dongle to power the buffers on the
transmitting signals and/or to auto-adjust the threshold on the
receiving side, so they should match the I/O voltage on the JTAG signals.
I don't know your chip, but if it uses 3.3V levels for JTAG, then
connecting to the 3.3V supply on the CPU (or any point that is connected
to the same voltage rail) should work.
cu
Michael
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