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can anybody provide some basic idea to get digital data from A/D converter(HSMC) into cyclone IVE fpga and pass it into computer via USB port.
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Not really, your questions are too vague.
1) What ADC? How many bits and at what speed does it operate?
2) Which version of USB - 1.0 (12Mbps), 2.0 (480Mbps), or 3.0 (5Gbps)?
3) Do you have a specific board in mind? Since you mention HSMC, its likely you already have a board.
Provide this information and you'll get more help.
Cheers,
Dave