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Hello,
I have a 100Mhz clock input to ARRIA-V GX device. this clock input connected to the negative input clock I/O - CLK0N_AP31/DIFFIO_RX_B2N. This clock is driven to a PLL (integer PLL). Is it posible to connect PLL input to a negative input clock (CLK0N_AP31/DIFFIO_RX_B2N)?????? When I compile the project I am getting this ERROR: Error (175001): Could not place fractional PLL Info (175028): The fractional PLL name: check_clk2pll_0002:check_clk2pll_inst|altera_pll:altera_pll_i|general[0].gpll~FRACTIONAL_PLL Error (177020): The PLL reference clock was not placed in a dedicated input pin that can reach the fractional PLL. Attached a test case (a CLK0N_AP31 I/O connected to a PLL ) THANKSLink Copied
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you may search for rd03302012_430.
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Or you can try connecting the clock input to CLK#p (positive clock) which has dedicated routing path to the PLL.
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