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 Posted - 11/19/2005 : 09:08:25
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I'm preparing a QPSK modulator,
until now I arrange it for a VIRTEX 1000 -4 , but it seem that could
be impossible to use it at a maximum clock speed of 165MHz especially
'cause I've to put in and out that speed and this seems not possible
(..or I'm wrong ??) I'm using less than 30% of VIRTEX 1000 so my
question is which FPGA is actually the one with best speed
performance, it could be not only Xilinx 'cause my scope is to verify
that there's actually a technology where my project could be
implemented. Thanks
Antonio
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Why not ?!? |
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ray
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 Posted - 11/21/2005 : 22:29:28
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The pick a smaller part it will be faster is true with the Altera parts, while it is not true in
the Xilinx parts with some minor variations in the setup and clock to out at the IOBs due to the size of
the clock network. Unlike Altera, the Xilinx structure features remain the same, as does the timing as
you move up the device size within the family. The virtex -4 is the earliest and slowest family of the
virtex architecture. If you are doing arithmetic logic, using block RAM or using the shift register
elements, you won't get those elements running at 165 MHz (with the exception of short carry chains) in
the -4 part. Unless you have a good reason (already have the parts on a board, forced to use -4 because
it is a Q-pro part, etc), move up to the Virtex-E family, it is faster and cheaper plus it has more BRAM
more clock DLLs and more options on the IO standards. You can make 165 MHz in pretty easily there. A
Virtex E-8 can run (with very careful design) at around 250 MHz, and the newer virtexII family is quite a
bit faster |
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The speedest FPGA
