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| EP3C5E144C8N Datasheet, PDF (112/348 Pages) Altera Corporation – Ability to disable external JTAG port | |||
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6â14
Chapter 6: I/O Features in the Cyclone III Device Family
Termination Scheme for I/O Standards
Voltage-Referenced I/O Standard Termination
Voltage-referenced I/O standards require an input reference voltage (VREF) and a
termination voltage (VTT). The reference voltage of the receiving device tracks the
termination voltage of the transmitting device, as shown in Figure 6â6 and Figure 6â7.
Figure 6â6. Cyclone III Device Family HSTL I/O Standard Termination
Termination
HSTL Class I
HSTL Class II
External
On-Board
Termination
Transmitter
VTT
50 ï
50 ï
VREF
Receiver
Transmitter
VTT
VTT
50 ï 50 ï
50 ï
VREF
Receiver
OCT with
and without
Calibration
Cyclone III Device
Family Series OCT
50 ï
Transmitter
VTT
50 ï
50 ï
VREF
Receiver
Cyclone III Device
Family Series OCT
25 ï
VTT
50 ï
VTT
50 ï
50 ï
VREF
Transmitter
Receiver
Figure 6â7. Cyclone III Device Family SSTL I/O Standard Termination
Termination
SSTL Class I
SSTL Class II
External
On-Board
Termination
VTT
25 ï
50 ï
50 ï
VREF
Transmitter
Receiver
OCT with
and without
Calibration
Cyclone III Device
Family Series OCT
50 ï
VTT
50 ï
50 ï
VREF
Transmitter
Receiver
VTT
VTT
50 ï
25 ï
50 ï
50 ï
VREF
Transmitter
Receiver
Cyclone III Device
Family Series OCT
25 ï
VTT
50 ï
VTT
50 ï
50 ï
VREF
Transmitter
Receiver
Cyclone III Device Handbook
Volume 1
December 2011 Altera Corporation
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