HC4GX15 Datasheet, PDF (128/668 Pages) Altera Corporation – HardCopy IV Device Handbook

8–18
Chapter 8: High-Speed Differential I/O Interfaces and DPA in HardCopy IV Devices
Differential Pin Placement Guidelines
Figure 8–18. Corner and Center Left/Right PLLs Driving DPA-Enabled Differential I/Os in the Same
Bank Using Both Center Left/Right PLLs
Corner
Left/Right PLL
Reference
CLK
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
Diff I/O
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
DPA-enabled
Diff I/O
Channels driven by
Corner Left/Right PLL
One Unused
Channel for Buffer
Channels driven by
Center Left/Right PLL
DPA-enabled
Diff I/O
Reference
CLK
Center
Left/Right PLL
You can use center left or right PLLs to drive DPA-enabled channels simultaneously,
as long as they drive these channels in their adjacent banks only, as shown in
Figure 8–19.
If one of the center left or right PLLs drives the top and bottom banks, the other center
left or right PLL cannot be used to drive differential channels, as shown in
Figure 8–19.
HardCopy IV Device Handbook, Volume 1
© January 2010 Altera Corporation