Can't communicate with device.

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Can't communicate with device.

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hello,everyone:

i used some open cores,but i am sure that the connection cable and the Power are all right ,why dose Quartus give me this message?

Info: Ended Programmer operation at Wed Jun 15 09:19:43 2005

Info: Started Programmer operation at Wed Jun 15 09:20:50 2005

Info: Configuring device index 1

Info: Device 1 contains JTAG ID code 0x020930DD

Info: Configuration succeeded -- 1 device(s) configured

Info: Successfully performed operation(s)

Info: Ended Programmer operation at Wed Jun 15 09:20:55 2005

Error: Can't communicate with device. Device will stop functioning when it reaches its non-tethered mode timeout limit.

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