Related Information
on page 4-22
Provides more information about PLL migration between Cyclone V SX C2, C4, C5, and C6 devices.
PLL Migration Guidelines
If you plan to migrate your design between Cyclone V SX C2, C4, C5, and C6 devices, and your design
requires a PLL to drive the HSSI and clock network (GCLK or RCLK), use the PLLs on the left side of the
device.
Table 4-8: Location of PLLs for PLL Migration
PLL Location (Left Side)
Member Code
Variant
FRACTIONALPLL_X0_Y14
C2
Cyclone V SX
C4
FRACTIONALPLL_X0_Y32
C5
C6
Related Information
PLL Locations in Cyclone V Devices
on page 4-17
Provides more information about
CLKIN
pin connectivity to the PLLs.
Fractional PLL Architecture
Figure 4-23: Fractional PLL High-Level Block Diagram for Cyclone V Devices
Clock
Switchover
Block
inclk0
inclk1
Dedicated
Clock Inputs
Cascade Input
from Adjacent PLL
pfdena
clkswitch
clkbad0
clkbad1
activeclock
PFD
Lock
Circuit
locked
÷N
CP
LF
VCO
÷2
GCLK/RCLK
8
4
FBIN
DIFFIOCLK Network
GCLK/RCLK Network
Direct Compensation Mode
ZDB, External Feedback Modes
LVDS Compensation Mode
Source Synchronous, Normal Modes
÷C0
÷C1
÷C2
÷C3
÷C8
÷M
PLL
Output
Multiplexer
Casade Output
to Adjacent PLL
GCLKs
RCLKs
External Clock Outputs
TX Serial Clock
TX Load Enable
FBOUT
External Memory
Interface DLL
8
PMA Clocks
Delta Sigma
Modulator
Dedicated refclk
VCO Post Divider
Only C0 and C2 drive the TX
serial clock and C1 and C3
can drive the TX load enable.
This FBOUT port is fed by
the M counter in the PLLs.
For single-ended clock inputs, only the CLK<#>p pin
has a dedicated connection to the PLL. If you use the
CLK<#>n pin, a global or regional clock is used.
Fractional PLL Usage
You can configure the fractional PLL to function either in the integer or in the enhanced fractional mode.
One fractional PLL can use up to 9 output counters and all external clock outputs.
Fractional PLLs can be used as follows:
• Reduce the number of required oscillators on the board
Clock Networks and PLLs in Cyclone V Devices
Altera Corporation
CV-52004
PLL Migration Guidelines
4-22
2014.01.10