JTAG power consumption

[Altera_Forum]

I am using a MAXII EPM240T100I5N device and I want to determine what the power consumption of the device is when it is running in JTAG (boundary-scan) mode when the device is running without any configuration on it. I have checked the device resources thoroughly and there is no indication as to how I would find this out. Does anyone have any ideas where I can find this information?

[Altera_Forum]

MAX II is a SRAM based device, power consumption is mainly caused by switching actions. I think, without JTAG activity, you can expect the standby supply current specified in the datasheet.

[Altera_Forum]

Assuming that in the worst case, all the boundary-scan capable pins were active and driving the output, what kind of power would that draw?

[Altera_Forum]

Solely depend on the output load.

[Altera_Forum]

I understand that it will depend on what load is attached to each pin, but I am trying to establish the worst-case current sourcing to use as a benchmark. In other words, what is the maximum current that each JTAG output can supply assuming a 3.3V output? Is there anywhere that such information is available?

[Altera_Forum]

--- Quote Start ---  the maximum current that each JTAG output can supply  --- Quote End ---   I presume, you mean IO pins configured as output.  IO pins have no current limiting function and you shouldn't short or overload them without risking to damage the chip. A maximum current of 25 mA has to be kept according to the datasheet. When shorted, a pin can sink or source up to 60 mA, which isn't permitted as continuous current.

[Altera_Forum]

Yes FvM, that is what I meant. I did not phrase it technically correctly. The information regarding the maximum allowed output current and the shorting is useful and is what I was looking for. Where can I obtain a reference containing such information?

[Altera_Forum]

Just look at the MAX II datasheet, Chapter 5. DC & Switching Characteristic.

[Altera_Forum]

Thank you FvM