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Ixiasoft
4.2. Arria V PLLs
PLLs provide robust clock management and synthesis for device clock management, external system clock management, and high-speed I/O interfaces.
The Arria® V device family contains fractional PLLs that can function as fractional PLLs or integer PLLs. The output counters in Arria® V devices are dedicated to each fractional PLL that support integer or fractional frequency synthesis.
Two adjacent PLLs share 18 C output counters. Any number of C counters can be assigned to each PLL, as long as the total number used by the two PLLs is 18 or less.
The Arria® V devices offer up to 16 fractional PLLs in the larger densities. All Arria® V fractional PLLs have the same core analog structure and features support.
Feature | Support |
---|---|
Integer PLL | Yes |
Fractional PLL | Yes |
C output counters | 18 |
M, N, C counter sizes | 1 to 512 |
Dedicated external clock outputs | 4 single-ended or 2 single-ended and 1 differential |
Dedicated clock input pins | 4 single-ended or 4 differential |
External feedback input pin | Single-ended or differential |
Spread-spectrum input clock tracking | Yes 8 |
Source synchronous compensation | Yes |
Direct compensation | Yes |
Normal compensation | Yes |
Zero-delay buffer compensation | Yes |
External feedback compensation | Yes |
LVDS compensation | Yes |
Voltage-controlled oscillator (VCO) output drives the DPA clock | Yes |
Phase shift resolution | 78.125 ps 9 |
Programmable duty cycle | Yes |
Power down mode | Yes |
Section Content
PLL Physical Counters in Arria V Devices
PLL Locations in Arria V Devices
PLL Migration Guidelines
Fractional PLL Architecture
PLL Cascading
PLL External Clock I/O Pins
PLL Control Signals
Clock Feedback Modes
Clock Multiplication and Division
Programmable Phase Shift
Programmable Duty Cycle
Clock Switchover
PLL Reconfiguration and Dynamic Phase Shift