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Found 1 result

  1. cawhitley

    Fast internal clock on DUO

    Has anyone attempted to use a fast internal clock speed on the DUO? I tried to use the clk_32to960_pll.vhd entity (via its symbol), but the resulting clock is not stable, as far as I can tell. The two methods that I tested that with are (1) serial communications, and (2) watching a blinking LED. As far as I can tell, theoretically, the Spartan 6 can run at up to 1 GHz internally. For a 32 MHz input clock, the PLL would need a multiplier of 32 to reach 1 GHz. So, I am asking whether anyone has had success using such a fast clock rate (i.e., faster than about 375 MHz). Thanks!