Re: [video] About DCT cores

[305liuzg@163.net]

Hi,Richard 
I synthesised your DCT core in synplify
and found it cost many Altera FPGA LEs,more than 10000LEs.my god!
The coefficents rom and multiply operation may cost much resoure.
How can I reduce the LE resoures?
Thanks & Regards
----- Original Message ----- 
From: Richard Herveille <richard@a... > 
To: video@o...  
Date: Mon, 25 Nov 2002 19:37:48 +0100 
Subject: Re: [video] About DCT cores 

> 
> 
> 
> > Hello All; 
> > 
> > I am a beginner to FPGA programming scratching around, 
> Therefore I would 
> > like to ask you some questions for your assistance.. I am 
> about to select a 
> > thesis project about compression systems. I need to compress 
> 256x256 
> > digitized video signal and after some operations i need to 
> decompress it by 
> > using IDCT.. For this I have seen Sherif Taher Eid's DCT cores 
> under 
> > http://www.opencores.org/cores/dct/dct.shtml . How can I use 
> these cores 
> > for my circuit? 
> 
> I only took a glance at Sherif Taher's core, but never really 
> looked at the 
> code. Anyway it is a mono-dimensional 8entries DCT. 
> 
> > 
> > On the other hand I have seen Video Systems project under 
> > http://www.opencores.org/projects/video_systems ..Can I also 
> use this 
> > Core?? 
> > 
> 
> Whereas the DCT unit from the video_compression_systems is a true 
> two-dimensional 8x8 DCT as needed by MPEG. 
> 
> > Are these Cores like java classes in practice? Should i 
> > process these cores in the same FPGA chip that i will be using 
> for my 
> > programs? 
> 
> Hmm. These are verilog cores. Verilog and VHDL are universal 
> languages that 
> allow you to write target independant hardware. This means you can 
> use the 
> same code to target an Altera or Xilinx FPGA, or target an ASIC. 
> JAVA classes is a different kind of sport (software not hardware), 
> but for 
> comparison purposes you might think of hardware modules as building 
> blocks to 
> generate the design. 
> 
> Richard 
> 
> 
> > 
> > I am bit confused, if you could help me about my questions 
> then i will be 
> > very happy. 
> > 
> > 
> > 
> > Have a good day, 
> > 
> > 
> > Aris 
> 
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