[USRP-users] Fwd: USRP2 schematic vs. FPGA source discrepancy

Robin Coxe robin.coxe at ettus.com
Sat Nov 4 12:53:45 EDT 2017

Hi Michal.   The USRP2 is a discontinued product that was introduced before
Ettus Research was integrated into the National Instruments manufacturing
infrastructure.    Unfortunately, the only schematics and FPGA pin
constraints files that we have on hand are the ones that you have already
located.   All of the people who were involved in developing the USRP2 no
longer work at Ettus Research.

The Xilinx XC3S2000 FPGA used on the USRP2 is the FG456 package.   Detailed
information about the pinout can be found starting at p. 175 of the Xilinx

You could try powering on the board and probing pin V15 with an
oscilloscope to see if you observe either a clock signal or a pulse when
you press SW1.  If I had to guess, the FPGA constraints file is most likely
more up to date than the schematic.

If you would prefer to develop on a USRP that is still a released and
actively supported, you might consider the USRP N200 or N210.


On Sat, Nov 4, 2017 at 5:37 AM, Michał Wróbel via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Dear usrp-users,
> Maybe you've got the answer to my question below.
> Thanks,
> Michał
> ---------- Forwarded message ----------
> From: Michał Wróbel <michal.a.wrobel at gmail.com>
> Date: 2017-10-28 19:32 GMT+02:00
> Subject: USRP2 schematic vs. FPGA source discrepancy
> To: support at ettus.com
> Dear Ettus Research support team,
> I am considering customizing USRP2 FPGA contents, however there seems to
> be a discrepancy between USRP2 schematics
> <https://files.ettus.com/schematics/usrp2/usrp2.pdf> and FPGA constraints
> file
> <https://github.com/EttusResearch/fpga/blob/maint/usrp2/top/USRP2/u2_rev3.ucf>.
> On the schematics the pin V15 is connected to S1 switch, while the
> constraints file attaches this pin to PHY_CLK signal. Is it possible that
> the schematics and the constraints file are for different revisions of
> USRP2 hardware?
> Judging from the filename I presume the FPGA constraints file is for
> "revision 3". Which hardware revision do the schematics describe? Where can
> I find schematics and FPGA constraints file for "USRP2 Rev 4.0", which I
> own?
> Thank you in advance,
> Michał Wróbel
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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