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osbourne
Joined: 13 Jun 2005
Posts: 48
Helped: 1
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 16 Jun 2005 12:43 xst vs leonardo spectrum |
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Hi,
is there anybody who has experience with both synthesis engines, XST and Leonardo ? Are there major differences ? WHich one is better ?
Regards,
Osbourne (special greetings to HELMUT !!!!!)
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Renjith
Joined: 03 Jan 2005
Posts: 179
Helped: 9
Location: India
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16 Jun 2005 13:08 XST vs. Leonardo Spectrum |
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Leornardo is atleast a step higher compared with XST.
ISE is a unique IDE for acheiving the whole data flow in an FPGA design, and so u cannot expect a very high performance from the same.
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no_mad
Joined: 10 Dec 2004
Posts: 253
Helped: 20
Location: Naboo
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16 Jun 2005 13:16 Re: XST vs. Leonardo Spectrum |
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Hi osbourne,
In my opinion, I would say Leonardo Spectrum is much much better than XST (xilinx) synthesis engine.
The reason is
-Leonardo was developed to synthesis and it's cost you a lot. Means, the synthesis engine is definitely very good compare to XST.
-XST is come with Xilinx ISE and even you can donwload ISE for free (web edition). The thing is synthesis engine or tool (Xilinx XST) is not their main product. They selling FPGA not a synthesis tool  . While Leonardo is a synthesis engine.
Thus, of course there are major differences.
I hope I've answer your question 
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Aser
Joined: 01 Jul 2004
Posts: 73
Helped: 5
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17 Jun 2005 10:15 Re: XST vs. Leonardo Spectrum |
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XST is under permanent developing.
And each new version is much more speculative one.
Espscially XST recognizes many idioms which are mapped into hardware very well.
Because XST is adapted to Virtex architecture.
Leonardo has origined as the tool for the situation in general.
It optimizes logic very well. It is adapted to FPGA.
But it is not adapted specially to Virtex.
Therefore usually the designer feels what idioms are mapped very well into
hardware, and drives the project to the optimum structure.
The examples of these idioms are represented in the user manual.
And XST serves better because it recognizes these idioms very well.
It is very important in DSP applications where the logic minimization does not matter.
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