If you have the v2 board you can use the PLL to change that 12MHz up to a high frequency (150 Mhz maybe?). You have to use a block and the icepll tool will gene

If you have the v2 board you can use the PLL to change that 12MHz up to a high frequency (150 Mhz maybe?). You have to use a block and the icepll tool will generate the code for the frequency you want.