I/O lines standards


#1

I’m just checking so’s I don’t destroy my USRP mboard. The I/O lines
such
as io_tx_13 etc. that are available on the flex 2400’s seem to go
straight
to the Cyclone FPGA. If that’s the case, are they set to LVCMOS or
LVTTL?
And, is the voltage used 3.3 V? I think I read the answer on the
schematics, but I need to check!
Thanks, All.


Dr. Don L. AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com


#2

Don L. wrote:

I’m just checking so’s I don’t destroy my USRP mboard. The I/O lines such
as io_tx_13 etc. that are available on the flex 2400’s seem to go straight
to the Cyclone FPGA. If that’s the case, are they set to LVCMOS or LVTTL?
And, is the voltage used 3.3 V? I think I read the answer on the
schematics, but I need to check!
Thanks, All.

They go straight to the FPGA. They are 3.3V CMOS. Don’t pull more than
about 5mA.

Matt