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Honored Contributor
18 years agoNo, you do not need to create the 25MHz clock using a PLL. The DE Boards External Interface core does that for you. If you select the VGA clock using the check box in the DE Boards External Interface core's GUI, then your system will contain the output VGA_CLK_from_the_DE_Board_0, which you will need to connect to the pin: PIN_B8 (VGA_CLK).
There has been a recent update to the DE Boards External Interface core, which you should download and replace your existing core with. download the de boards external interface (ftp://ftp.altera.com/up/pub/university_program_ip_cores/de_boards_external_interface.zip)