2.9.7 Clock Skew Minimization

The following figure indicates how feedback from the clock network can be used to create minimal skew between the distributed clock network and the input clock. The input clock is fed to the reference clock input of the PLL. The output clock (CLK2) feeds a routed clock network. The feedback input to the PLL uses a clock input delayed by a routing network. The PLL then adjusts the phase of the input clock to match the delayed clock, thus providing nearly zero effective skew between the two clocks. For more information, see the Axcelerator Family PLL and Clock Management application note.