Re: [Discuss-gnuradio] differences between USRP2 rev 3 and rev 4 boards

For now it doesn't do anything. If you'd like to connect it in the
verilog you are welcome to.

Matt

On 10/13/2010 09:16 AM, David Evans wrote:
>
>
> What's the push button for?
>
>
> Dave
>
>
> ----- Original Message ----
> From: Matt Ettus<matt@ettus.com>
> To: Steve Mcmahon<steve.mcmahon44@yahoo.com>
> Cc: GNR<discuss-gnuradio@gnu.org>
> Sent: Tue, 12 October, 2010 23:16:23
> Subject: Re: [Discuss-gnuradio] differences between USRP2 rev 3 and rev 4 boards
>
> On 10/12/2010 02:22 PM, Steve Mcmahon wrote:
>> I am wondering what are the differences between the USRP2 rev 3 board
>> and the rev 4 board?
>>
>> I have one of each (one I ordered maybe a year ago and one I ordered
>> this past summer), and I don't see any differences on the board
>> itself. I understand that the versions of the FPGA image and the
>> firmware that shipped on the SD card from the factory would be
>> different, since over a year of time elapsed between my purchasing
>> the two boards. But what else is different? I can't find a changelog
>> for the USRP2 boards anywhere.
>
> Some clocks were reorganized for layout reasons and the PPS input circuit was
> modified to have a more consistent delay. The same FPGA image works for both.
>
> Matt
>
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