6–14
Chapter 6: I/O Features in Cyclone IV Devices
Termination Scheme for I/O Standards
March 2016
Altera Corporation
Voltage-Referenced I/O Standard Termination
Voltage-referenced I/O standards require an input reference voltage (V
REF
) and a
termination voltage (V
TT
). The reference voltage of the receiving device tracks the
termination voltage of the transmitting device, as shown in
and
.
Figure 6–5. Cyclone IV Devices HSTL I/O Standard Termination
HSTL Class I
HSTL Class II
External
On-Board
Termination
OCT with
and without
Calibration
VTT
50
Ω
50
Ω
VTT
50
Ω
VTT
50
Ω
Transmitter
Transmitter
Receiver
Receiver
VTT
50
Ω
Transmitter
Receiver
VTT
50
Ω
VTT
50
Ω
Transmitter
Receiver
Cyclone IV Device
Family Series OCT
50
Ω
Cyclone IV Device
Family Series OCT
25
Ω
VREF
VREF
VREF
VREF
Termination
50
Ω
50
Ω
50
Ω
Figure 6–6. Cyclone IV Devices SSTL I/O Standard Termination
SSTL Class I
SSTL Class II
External
On-Board
Termination
OCT with
and without
Calibration
VTT
50
Ω
25
Ω
VTT
50
Ω
25
Ω
VTT
50
Ω
Transmitter
Transmitter
Receiver
Receiver
VTT
50
Ω
50
Ω
Transmitter
Receiver
Cyclone IV Device
Family Series OCT
50
Ω
VTT
50
Ω
25
Ω
50
Ω
VTT
50
Ω
Transmitter
Receiver
Cyclone IV Device
Family Series OCT
VREF
VREF
VREF
VREF
Termination
50
Ω
50
Ω
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...
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Страница 280: ...I 2 Section I Transceivers Cyclone IV Device Handbook February 2015 Altera Corporation Volume 2...
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