EP1C3 datasheet(8/385 Pages) ETC2

8 / 385 page

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Altera Corporation

Preliminary

Cyclone Device Handbook, Volume 1

Section V. Design Considerations

Revision History .................................................................................................................................. 10–1

Chapter 10. Implementing Double Data Rate I/O Signaling in Cyclone Devices

Introduction .......................................................................................................................................... 10–1

Double Data Rate Input ...................................................................................................................... 10–1

Double Data Rate Output ................................................................................................................... 10–2

Bidirectional Double Data Rate ......................................................................................................... 10–3

DDR Memory Support ........................................................................................................................ 10–4

Conclusion ............................................................................................................................................ 10–4

Referenced Documents ....................................................................................................................... 10–4

Document Revision History ............................................................................................................... 10–5

Chapter 11. Using Cyclone Devices in Multiple-Voltage Systems

Introduction .......................................................................................................................................... 11–1

I/O Standards ...................................................................................................................................... 11–1

MultiVolt I/O Operation .................................................................................................................... 11–2

5.0-V Device Compatibility ................................................................................................................ 11–3

Hot-Socketing ....................................................................................................................................... 11–6

Devices Can Be Driven before Power-Up ................................................................................... 11–6

I/O Pins Remain Tri-Stated during Power-Up .......................................................................... 11–6

Signal Pins Do Not Drive the VCCIO or VCCINT Power Supplies .............................................. 11–6

Power-Up Sequence ............................................................................................................................ 11–7

Power-On Reset ................................................................................................................................... 11–7

Conclusion ............................................................................................................................................ 11–8

Document Revision History ............................................................................................................... 11–8

Chapter 12. Designing with 1.5-V Devices

Introduction .......................................................................................................................................... 12–1

Power Sequencing and Hot Socketing ............................................................................................. 12–1

Using MultiVolt I/O Pins ................................................................................................................... 12–2

Voltage Regulators .............................................................................................................................. 12–3

Linear Voltage Regulators ............................................................................................................. 12–4

Switching Voltage Regulators ...................................................................................................... 12–6

Maximum Output Current ........................................................................................................... 12–8

Selecting Voltage Regulators ........................................................................................................ 12–8

Voltage Divider Network ............................................................................................................ 12–10

1.5-V Regulator Circuits .............................................................................................................. 12–10

1.5-V Regulator Application Examples .......................................................................................... 12–19

Synchronous Switching Regulator Example ............................................................................ 12–20

Board Layout ...................................................................................................................................... 12–21

Split-Plane Method ....................................................................................................................... 12–23

Conclusion .......................................................................................................................................... 12–24

References ........................................................................................................................................... 12–24

Referenced Documents ..................................................................................................................... 12–25

Document Revision History ............................................................................................................. 12–25

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