[hpsdr] Mercury

[Eric Blossom]

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

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