writing an array to text file

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You didn't say if this was a simulation or in an FPGA. If it's simulation, see the modelsim documentation. For an FPGA you have two choices. You can use system console if you are connected via JTAG. Or, you can add a processor system and software with an interface to an SD card. All of this is described in the Altera documentation.

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it is for simulation

can u please tell some example codes