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Chapter 6: I/O Features in Cyclone IV Devices
6–15
Termination Scheme for I/O Standards
March 2016
Altera Corporation
Differential I/O Standard Termination
Differential I/O standards typically require a termination resistor between the two
signals at the receiver. The termination resistor must match the differential load
impedance of the bus (refer to
).
Cyclone IV devices support differential SSTL-2 and SSTL-18, differential HSTL-18,
HSTL-15, and HSTL-12, PPDS, LVDS, RSDS, mini-LVDS, and differential LVPECL.
Figure 6–7. Cyclone IV Devices Differential HSTL I/O Standard Class I and Class II Interface and Termination
External
On-Board
Termination
OCT
Transmitter
Receiver
VTT
VTT
Transmitter
Receiver
VTT
VTT
Cyclone IV Device
Family Series OCT
50
Ω
Differential HSTL Class I
Termination
Differential HSTL Class II
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT VTT
50
Ω
50
Ω
VTT VTT
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT
VTT
50
Ω
50
Ω
VTT
VTT
Cyclone IV Device
Family Series OCT
25
Ω
50
Ω
50
Ω
50
Ω
50
Ω
50
Ω
50
Ω
50
Ω
50
Ω
Figure 6–8. Cyclone IV Devices Differential SSTL I/O Standard Class I and Class II Interface and Termination
:
(1) Only Differential SSTL-2 I/O standard supports Class II output.
Differential SSTL Class I
Differential SSTL Class II
External
On-Board
Termination
OCT
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT
VTT
25
Ω
25
Ω
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT VTT
25
Ω
25
Ω
50
Ω
50
Ω
VTT VTT
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT
VTT
50
Ω
50
Ω
VTT
VTT
Cyclone IV Device
Family Series OCT
25
Ω
Transmitter
Receiver
50
Ω
50
Ω
50
Ω
50
Ω
VTT
VTT
50
Ω
Cyclone IV Device
Family Series OCT
Termination
Содержание Cyclone IV
Страница 10: ...x Chapter Revision Dates Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Страница 14: ...I 2 Section I Device Core Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Страница 106: ...II 2 Section II I O Interfaces Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Страница 164: ...III 2 Section III System Integration Cyclone IV Device Handbook March 2016 Altera Corporation Volume 1...
Страница 274: ...vi Contents Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Страница 276: ...viii Chapter Revision Dates Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Страница 280: ...I 2 Section I Transceivers Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
Страница 440: ...iv Contents Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
Страница 442: ...vi Chapter Revision Dates Cyclone IV Device Handbook December 2016 Altera Corporation Volume 3...
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