Hi, I am working on a 10 Gb Ethernet project (deep packet inspection) and need to implement CAM in my FPGA. I am using a Stratix GX and I don't think I can use CAM (internal or external) in the stratix GX Dev Board. Let me know your thoughts about that. Thanks a lot.
CAM, TCAM in Stratix
Started by ●April 21, 2006
Reply by ●April 21, 20062006-04-21
Freechip, http://www.xilinx.com/products/design_resources/mem_corner/grouping/cam.htm I am not suggesting you switch to Xilinx, but we do have answers. Austin freechip wrote:> Hi, > I am working on a 10 Gb Ethernet project (deep packet inspection) and need > to implement CAM in my FPGA. I am using a Stratix GX and I don't think I > can use CAM (internal or external) in the stratix GX Dev Board. > > Let me know your thoughts about that. > > Thanks a lot.
Reply by ●April 21, 20062006-04-21
"freechip" <freechip@hotmail.fr> wrote in message news:VqSdnSn0Kpv2YtXZRVn_vA@giganews.com...> > Hi, > I am working on a 10 Gb Ethernet project (deep packet inspection) and need > to implement CAM in my FPGA. I am using a Stratix GX and I don't think I > can use CAM (internal or external) in the stratix GX Dev Board. > > Let me know your thoughts about that. > > Thanks a lot.How big a (Ternary?)CAM do you need?
Reply by ●April 24, 20062006-04-24
>"freechip" <freechip@hotmail.fr> wrote in message >news:VqSdnSn0Kpv2YtXZRVn_vA@giganews.com... >> >> Hi, >> I am working on a 10 Gb Ethernet project (deep packet inspection) andneed>> to implement CAM in my FPGA. I am using a Stratix GX and I don't thinkI>> can use CAM (internal or external) in the stratix GX Dev Board. >> >> Let me know your thoughts about that. >> >> Thanks a lot. > >How big a (Ternary?)CAM do you need? > >Hi, I don't yet. Do you think it is possible with Altera products? Have a good day.
Reply by ●April 24, 20062006-04-24
Hi freechip, yes I think it is possible to build a CAM around Altera RAM blocks. How big is the CAM ? After how many clock cycles do you need a hit ? Rgds Andr=E9
Reply by ●April 24, 20062006-04-24
>Hi freechip, > >yes I think it is possible to build a CAM >around Altera RAM blocks. > >How big is the CAM ? After how many clock cycles >do you need a hit ? > >Rgds >Andr=E9 > >Hi Andr, Actually, I am in the research phase and I really don't know how big is the cam. I just wanted to know, to compare to Xilinx Family, if it was poosible to use cam with Altera product. For my project (deep packet inspection), the use of the cam is necessary. If you can tell me how can a build a cam around Altera RAM block (and the max. of the cam without my answers to your questions), I will be very pleased. Thanks.
Reply by ●April 24, 20062006-04-24
>>How big a (Ternary?)CAM do you need? >> >>freechip wrote:> > Hi, > I don't yet. > Do you think it is possible with Altera products? > Have a good day.It's possible to build teeny, tiny CAMs. The information Austin pointed out gives you an idea of what you can accomplish with FPGA resources that can apply to all FPGAs, not just Xilinx. If you need a few entries, you might be okay. If you need small entries, you may be able to do many more. Read that documentation and you'll get a feel for the limits you're faced with. Personally, I'd love a 4kx20 CAM but I know there's no way to do it in an FPGA>
Reply by ●April 24, 20062006-04-24
John_H wrote:> It's possible to build teeny, tiny CAMs. The information Austin pointed > out gives you an idea of what you can accomplish with FPGA resources > that can apply to all FPGAs, not just Xilinx. > > If you need a few entries, you might be okay. If you need small > entries, you may be able to do many more.However, if you plan decode 32 bit or 128 bit IP addresses, an FPGA solution will likely cost just as much and not work quite as well as a real CAM. -- Mike Treseler
Reply by ●April 24, 20062006-04-24
"Mike Treseler" <mike_treseler@comcast.net> wrote in message news:4b4hneFvg226U1@individual.net...> > However, if you plan decode 32 bit or 128 bit IP addresses, > an FPGA solution will likely cost just as much and not > work quite as well as a real CAM. > > -- Mike TreselerBut if each 128-bit IP address only needs 4 slices and the number of IP addresses is rather limited, the cost can be much better than a real CAM.
Reply by ●April 25, 20062006-04-25