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- 4.1.2. s0_axi4_clock_out for Agilex 5 E-Series External Memory Interfaces (EMIF) IP - DDR4 Component
- 4.2.2. s0_axi4_clock_out for Agilex 5 E-Series External Memory Interfaces (EMIF) IP - DDR5 Component
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12.10.1.3. Skew
Trace length variations cause data valid window variations between the signals, reducing margin. For example, DDR4-3200 at 1600 MHz has a data valid window that is smaller than 313 ps. Trace length skew or crosstalk can reduce this data valid window further, making it difficult to design a reliably operating memory interface. Ensure that the skew figure previously entered into the Altera FPGA IP matches that actually achieved on the PCB, otherwise Quartus® Prime timing analysis of the interface is accurate.