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From: sradio at opencores.org<sradio@o...>
Date: Thu Jul 8 04:05:03 CEST 2004
Subject: [oc] radix 4 complex fft by ZHAO Ming ==> DCT
The read address is diffrent from write address, so need a dualport ram.

My advice
1.Some new FPGA have many onchip dualport rams
2.slow down the speed, double size the singleport ram,add some
necessary circuit.




----- Original Message -----
From: dennis.binder@i...<dennis.binder@i...>
To:
Date: Wed Jul 7 12:43:06 CEST 2004
Subject: [oc] radix 4 complex fft by ZHAO Ming ==> DCT

> hello,
>
> I tried the cfft code with 64k and external dualported srams.
> everything worked well.
> because i'm analysing an interferrogramm, I neither need a complex
> fft
> nor a fft, but a discret cosinus transform would be enough.
> As a consequence, I would get disposed of one external dport-ram
> (the
> Qram).
> maybe anybody has an idea, how to modify the original code to get
> get cosinus transform.
> I tried the cfft code with only one external ram, but the
> intermediate
> results
> of the core are mixed in both dport-rams.
> glad about any response and still waiting
> greeting from the rainy south of germany
> Dennis
>
>