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So, I need a LP-serial 4x RapidIO. Thus can I use any of these transceivers?
And what about the DE4 dev board is it able (it's cheaper)?
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Please don't quote things like "LP-serial", it means nothing to people who do not use that specification. Provide 'real' numbers, like lane rates.
Googling LP-serial x4 RapidIO ...
http://www.rapidio.org/data/specs/serialspec_v_1pt2.pdf Given the lane speeds and use of 8/10B encoding, you would use transceivers on the boards.
Both the Stratix IV GX development kit and the DE4 board can be used to implement the serial RapidIO protocol.
Before buying a board, do yourself a favor and implement a design using Quartus and simulate the IP using Modelsim. You can download the pinout files for either kit. That'll help you decide whether or not what you want to do is possible, and it costs you nothing.
Cheers,
Dave