Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1 658
UG586 November 30, 2016
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Chapter 5: Multicontroller Design
System Clock Pins Selection
Select the system clock pins on the System Pins Selection page. System clock pins can be
selected for each controller; this varies based on the number of controllers (Figure 5-18).
System Clock Sharing
The criteria for sharing a system clock pin is as follows:
• System clock pins can be shared across the controllers when the input frequency is the
same for the controllers.
• Pins can be shared across the controllers as long as the memory interface chosen banks
are in the same column.
RECOMMENDED: Although the MIG allows system clock selection to be in different super logic regions
(SLRs), it is not recommended due to the additional clock jitter in this topology.
• One CCIO port can drive any number of PLLs and there is no restriction on maximum
number of PLLs that a system clock pin can drive. So the same pin can be used for any
number of controllers.
• MIG validates the rules after clicking Next and following the selection for System Clock
pins is done.
• Selecting the same pin indicates the same pin is shared across the controllers.
• One PLL and one MMCM are needed for each controller regardless of system clock pin
is shared or not. System clock pin can only be shared and no other resources (PLL or
MMCM) are shared across controllers.
X-Ref Target - Figure 5-18
Figure 5-18: System Clock Pins Selection Page
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