[hpsdr] Mercury

[Philip Covington]

On 9/23/06, Eric Blossom <eb at comsec.com> wrote:
> On Sat, Sep 23, 2006 at 06:16:13PM -0400, Philip Covington wrote:
>
> > Hi Phil,
> >
> > Mercury:
> > If we go with the AD6636, by using a couple of 74LVC16374
> > <http://www.nxp.com/pip/74LVC16374ADL.html>
> > 16 bit D FFs, we can either route the ADC input to the AD6636 or
> > straight to the FPGA on the Mercury board.  That way we can support
> > radio mode with the AD6636 and spec/oscope mode in the FPGA.  To use
> > the board just as a scope or spectrum analyzer the AD6636 would not
> > have to be populated on the board.  It would also allow
> > experimentation with DDC in the FPGA with a fallback to the AD6636
> > otherwise.
>
> > The IDT72V293 <http://www.idt.com/?genID=72V293> looks like a good
> > candidate for a FIFO.  I think we'd be better off with an external
> > FIFO than just SRAM.  What do you think?
>
> Sorry, not clear to me where you're thinking the FIFO goes...
> How much FIFO do you think you'll need?
> Can you just burn a bit of your FPGA ram?
>
> Eric, K7GNU
>

The FIFO is part of the oscilloscope/spectrum analyzer function.
Currently we are using FPGA Ram for this but we would like to have a
larger FIFO than what we can currently fit in the FPGA.  This has
nothing to do with its function as a receiver.

Phil N8VB

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