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zcq
Joined: 14 Jul 2001
Posts: 112
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 26 Sep 2003 14:56 What's the max frequency Xilinx FPGA can run? |
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For Virtex 2 or virtex pro?
Thanks!
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drwho78
Joined: 01 Jan 1970
Posts: 214
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| 26 Sep 2003 15:15 Re: What's the max frequency Xilinx FPGA can run? |
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| I have run designs with the fastest speed grades at about 260 MHz. You may be able to squeeze more out of these chips. The speed can be affected by your design, routing, and placement.
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it_boy
Joined: 18 Jul 2002
Posts: 181
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| 26 Sep 2003 17:39 Re: What's the max frequency Xilinx FPGA can run? |
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1. Depends on the speedgrade you select,
2. Depends on your design. More of combination logic in your design, lesser will be the acheivable frequency.
3. Depends on how big your design will be. If you are occupying more than 90% of the logic inside the FPGA, frequency will reduce noticeably.
4. Depends on your placement.
5. Depends on what kind of constraints you apply.
6. Depends on what kid of optimisation you choose.. area or speed
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ktuluboy
Joined: 27 Sep 2002
Posts: 4
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| 27 Sep 2003 2:32 Re: What's the max frequency Xilinx FPGA can run? |
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You can run a Virtex 2 pro up to 300Mhz...but it really depends of your design.
ktuluboy
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igorz
Joined: 30 Mar 2002
Posts: 16
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| 27 Sep 2003 22:32 Re: What's the max frequency Xilinx FPGA can run? |
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Actually, it's quite a difficult matter to run complex designs at speeds more than 200-250 MHz, even on FPGA's with high speed grades.
But with simple circuits (without DCM, sometimes - without global clocks, manually placed and routed) your can go above 1 GHz, I presume.
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juggernaut
Joined: 25 Jan 2002
Posts: 33
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| 28 Sep 2003 9:32 Re: What's the max frequency Xilinx FPGA can run? |
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My experience has been that you can design large and complex designs to run around 200MHz if you are very careful with pipelining and so on. You can certainly push beyond this to the 300MHz mark for simple circuits but you don't get more than a layer or two of combinatorial logic at these speeds, thus restricting what you can do...
The next xilinx family (Virtex4 - not sure what happened to Virtex3) will be made on .75um process, which is significantly smaller than the 1.3um process used for Virtex2/Virtex2pro, so I imagine that you'll be able to sail right through the 300-400MHz barrier when these devices become available...
J
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zcq
Joined: 14 Jul 2001
Posts: 112
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| 28 Sep 2003 16:11 |
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| Thanks for all the reply!
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