how to increase the depth of dcfifo more than 131000 words ?

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Why do You need such a big FIFO? This is maximum available. Either do Your own FIFO using RAM or use external FIFO chip.

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To keep a large chunk of data given from ADC, generally i want a FIFO to be as big as possible. now i want to build a DCFIFO based on SRAM(2MB). Any ideas how?

Thank you.

regards,

Michael