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EP4CE40 Datasheet(PDF) 87 Page - Altera Corporation |
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EP4CE40 Datasheet(HTML) 87 Page - Altera Corporation |
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87 / 488 page  Chapter 5: Clock Networks and PLLs in Cyclone IV Devices 5–25 Clock Feedback Modes October 2012 Altera Corporation Cyclone IV Device Handbook, Volume 1 Figure 5–14 shows a waveform example of the phase relationship of the PLL clocks in this mode. Zero Delay Buffer Mode In zero delay buffer (ZDB) mode, the external clock output pin is phase-aligned with the clock input pin for zero delay through the device. When using this mode, use the same I/O standard on the input clock and output clocks to guarantee clock alignment at the input and output pins. Figure 5–15 shows an example waveform of the phase relationship of the PLL clocks in ZDB mode. Figure 5–14. Phase Relationship Between PLL Clocks in Normal Mode Note to Figure 5–14: (1) The external clock output can lead or lag the PLL internal clock signals. PLL Reference Clock at the Input pin PLL Clock at the Register Clock Port External PLL Clock Outputs (1) Phase Aligned Figure 5–15. Phase Relationship Between PLL Clocks in ZDB Mode PLL Reference Clock at the Input Pin PLL Clock at the Register Clock Port External PLL Clock Output at the Output Pin Phase Aligned |
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