EP2AGX95EF29C6N Datasheet, PDF (281/380 Pages) Altera Corporation – Device Interfaces and Integration

Chapter 8: High-Speed Differential I/O Interfaces and DPA in Arria II Devices
Differential Pin Placement Guidelines
8–35
Using Both Center PLLs
You can use both center PLLs simultaneously to drive DPA-disabled channels on
upper and lower I/O banks. Unlike DPA-enabled channels, the center PLLs can drive
DPA-disabled channels cross-banks. For example, the upper center PLL can drive the
lower I/O bank at the same time the lower center PLL is driving the upper I/O bank,
and vice versa, as shown in Figure 8–29.
1 Center PLLs are available at the right I/O banks of Arria II GX devices and the right
and left I/O banks of Arria II GZ devices.
Figure 8–29. Both Center PLLs Driving Cross-Bank DPA-Disabled Channels Simultaneously
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
Reference
CLK
Center
PLL
Center
PLL
Reference
CLK
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
DPA-disabled
Diff I/O
July 2012 Altera Corporation
Arria II Device Handbook Volume 1: Device Interfaces and Integration