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I think local support is more important. ie do you have FAE for Altera or Xilinx in your are, how good are they, how is relationship with supply chain.. other then that it is comparing toyota to honda
using a synthesis tool like SynplifyPro or leonardo spectrum to find which FPGA is suitable for you then go for that.in these tools you have the option of implementing it in varioUS fpga and see the results
If you are going to use only HDLC you can go for any low end devices with 6-12 thousand gates. But if you are going to use it as a module for some other communication block, better go for high end FPGA's like Virtex or Spartan Series form Xilinx or APEX III or Cyclone devices from ALTERA.
spartan-III or virtex-2 pro are generally sufficient..
But the best thing to do is to synthesize the modules first and choose the FPGA based on the number of CLB's reported.
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