[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] FPGA firmware
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] FPGA firmware |
Date: |
Tue, 28 Aug 2007 15:11:44 -0700 |
User-agent: |
Mutt/1.5.9i |
On Tue, Aug 28, 2007 at 11:02:25PM +0200, Dominik Auras wrote:
> Hi!
>
> Am I right to state that the fpga firmware is configured as followed:
>
> Tx chain (0 to 2 possible)
> - NCO fine+coarse on Analog Devices Chip
> - low-pass 4x interpolation on AD-Chip
> - CIC interpolation filters, separate for I- and Q-Data
>
> Especially:
> Cordic turned off, internal DUC (duc.v) turned off?
Correct.
> And RX Chain (0 to 4 possible)
> - Cordic for downconversion
> - CIC decimator per I- and Q-Stream
> - Halfbandfilter, after CIC, per I/Q-Stream
The half-band is missing from the 4 DDC version because of resource
constraints.
> Also:
> DDC not used? (I mean, ddc.v)
Correct.
> Low-pass decimation filter on AD-Chip disabled.
Correct.
> I wonder if http://gnuradio.org/trac/wiki/UsrpRfxDiagrams is still correct.
yes, with the annotations.
> Greetings
> Dominik
Eric