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How can I find the reason why my Stratix III EP3SL340H1152I3N doesn't work.

ZNiu0
Beginner
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I designed circuitry for Stratix III EP3SL340H1152I3N. The FPGA doesn't work. I tested the voltage of the nStatus, CONF_DONE, and CRC_ERROR. The nStatus and CONF_DONE are always low and aren't released. The CRC_ERROR is always high which means there is wrong with SRAM. I don't know how to solve this problem. My power chipsets are switchers whose Line regulation and Load regulation satisfied the reqierement in Pin Connection Guidelines. Please help me .

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