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Re: [Discuss-gnuradio] USRP2 and ISE 12


From: Matt Ettus
Subject: Re: [Discuss-gnuradio] USRP2 and ISE 12
Date: Thu, 20 May 2010 08:29:52 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4


The problem is not the aeMB, it is how ISE is synthesizing it. We have been working on this problem and are very close to having a solution.

Matt


On 05/20/2010 08:22 AM, Tiago Rogério Mück wrote:
Well, it seems the aeMB guys are working on a new version of the the
core. Maybe the new core will perform better.


Em 14 de maio de 2010 18:17, Brian Padalino <address@hidden
<mailto:address@hidden>> escreveu:

    2010/5/14 Tiago Rogério Mück <address@hidden
    <mailto:address@hidden>>:
     > Hello,
     >
     > It seems that everyone is having troubles with ISE 11.x, but has
    anyone
     > tried the new ISE 12 ?
     >
     > We have successfully synthesized the USRP2 fpga code with ISE
    12.1, but we
     > got a timing error and the bitstream didn't seem to work:
    find_usrps didn't
     > find anything and the leds didn't flash.
     >
     > We are using the latest code from the repositories for both fpga and
     > firmware.
     >
     > Is there anyone who has tried ISE 12 and want to share the
    experience ?

    I am not building the USRP2 FPGA, or have experience with ISE 12, but
    the errors you have are all related to BRAM feeding the aeMB CPU -
    more specifically RAM output -> Mux -> Adder -> FF, mostly with 7 to
    10 layers of logic inbetween.

    Good luck debugging that portion of the CPU.  Hopefully you can
    achieve timing closure.

    Brian




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