Chapter 5: Clock Networks and PLLs in the Cyclone III Device Family
Clock Feedback Modes
No Compensation Mode
In no compensation mode, the PLL does not compensate for any clock networks. This
provides better jitter performance because clock feedback into the PFD does not pass
through as much circuitry. Both the PLL internal and external clock outputs are
phase-shifted with respect to the PLL clock input.
shows a waveform example of the phase relationship of the PLL clock in
Figure 5–9. Phase Relationship Between PLL Clocks in No Compensation Mode
Clock at the Input Pin
PLL Clock at the
Register Clock Port
External PLL Clock
(1) Internal clocks fed by the PLL are phase-aligned to each other.
(2) The PLL clock outputs can lead or lag the PLL input clocks.
An internal clock in normal mode is phase-aligned to the input clock pin. The external
clock output pin has a phase delay relative to the clock input pin if connected in this
mode. The Quartus II software timing analyzer reports any phase difference between
the two. In normal mode, the PLL fully compensates the delay introduced by the
Cyclone III Device Handbook
|Home - IC Supply - Link|
|Copyright© 2001 - 2014 ICPDF All Rights Reserved ICPDF.COM