vi Altera Corporation
Contents Stratix Device Handbook, Volume 2
Mixing Voltage Referenced & Non-Voltage Referenced Standards ....................................... 4–25
Drive Strength ...................................................................................................................................... 4–26
Standard Current Drive Strength .................................................................................................4–26
Programmable Current Drive Strength ...................................................................................... 4–27
Hot Socketing ....................................................................................................................................... 4–27
DC Hot Socketing Specification ................................................................................................... 4–28
AC Hot Socketing Specification ................................................................................................... 4–28
I/O Termination .................................................................................................................................. 4–28
Voltage-Referenced I/O Standards ............................................................................................. 4–28
Differential I/O Standards ............................................................................................................ 4–29
Differential Termination (RD) ...................................................................................................... 4–29
Transceiver Termination ............................................................................................................... 4–30
I/O Pad Placement Guidelines .......................................................................................................... 4–30
Differential Pad Placement Guidelines ....................................................................................... 4–30
VREF Pad Placement Guidelines ................................................................................................. 4–31
Output Enable Group Logic Option in Quartus II .................................................................... 4–34
Toggle Rate Logic Option in Quartus II ...................................................................................... 4–35
DC Guidelines ................................................................................................................................. 4–35
Power Source of Various I/O Standards ......................................................................................... 4–38
Quartus II Software Support .............................................................................................................. 4–38
Compiler Settings ........................................................................................................................... 4–38
Device & Pin Options .................................................................................................................... 4–39
Assign Pins ...................................................................................................................................... 4–39
Programmable Drive Strength Settings ...................................................................................... 4–40
I/O Banks in the Floorplan View .................................................................................................4–40
Auto Placement & Verification of Selectable I/O Standards ................................................... 4–41
Conclusion ............................................................................................................................................ 4–42
More Information ................................................................................................................................ 4–42
References ............................................................................................................................................. 4–42
Chapter 5. High-Speed Differential I/O Interfaces in Stratix Devices
Introduction ............................................................................................................................................ 5–1
Stratix I/O Banks ................................................................................................................................... 5–1
Stratix Differential I/O Standards ................................................................................................. 5–2
Stratix Differential I/O Pin Location ............................................................................................. 5–5
Principles of SERDES Operation ......................................................................................................... 5–6
Stratix Differential I/O Receiver Operation ................................................................................. 5–7
Stratix Differential I/O Transmitter Operation ........................................................................... 5–9
Transmitter Clock Output ............................................................................................................. 5–10
Divided-Down Transmitter Clock Output ................................................................................. 5–10
Center-Aligned Transmitter Clock Output ................................................................................ 5–11
SDR Transmitter Clock Output ....................................................................................................5–12
Using SERDES to Implement DDR ................................................................................................... 5–13
Using SERDES to Implement SDR .................................................................................................... 5–14
Differential I/O Interface & Fast PLLs ............................................................................................. 5–16
Clock Input & Fast PLL Output Relationship ............................................................................ 5–18
Fast PLL Specifications .................................................................................................................. 5–20
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