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33.7. Clock, PLL and Timing Considerations
Determine when the valid window occurs either by calculation or by analyzing the SDRAM pins with an oscilloscope. Then use a PLL to adjust the phase of the SDRAM clock so that edges occur in the middle of the valid window. Tuning the PLL might require trial-and-error effort to align the phase shift to the properties of your target board.
For details about the PLL circuitry in your target device, refer to the appropriate device family handbook.
For details about configuring the PLLs in Intel devices, refer to the ALTPLL IP Core User Guide.