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CDPCLK4 Scheda tecnica(PDF) 112 Page - Altera Corporation

Il numero della parte CDPCLK4
Spiegazioni elettronici  Cyclone III Device Handbook
PDF  274 Pages
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Produttore elettronici  ALTERA [Altera Corporation]
Homepage  http://www.altera.com
Logo ALTERA - Altera Corporation

CDPCLK4 Scheda tecnica(HTML) 112 Page - Altera Corporation

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6–14
Chapter 6: I/O Features in the Cyclone III Device Family
Termination Scheme for I/O Standards
Cyclone III Device Handbook
July 2012
Altera Corporation
Volume 1
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 6–6 and Figure 6–7.
Figure 6–6. Cyclone III Device Family HSTL I/O Standard Termination
HSTL Class I
HSTL Class II
External
On-Board
Termination
OCT with
and without
Calibration
VTT
50
50
VTT
50
VTT
50
Transmitter
Transmitter
Receiver
Receiver
VTT
50
Transmitter
Receiver
VTT
50
VTT
50
Transmitter
Receiver
Cyclone III Device
Family Series OCT
50
Cyclone III Device
Family Series OCT
25
VREF
VREF
VREF
VREF
Termination
50
50
50
Figure 6–7. Cyclone III Device Family SSTL I/O Standard Termination
SSTL Class I
SSTL Class II
External
On-Board
Termination
OCT with
and without
Calibration
VTT
50
25
VTT
50
25
VTT
50
Transmitter
Transmitter
Receiver
Receiver
VTT
50
50
Transmitter
Receiver
Cyclone III Device
Family Series OCT
50
VTT
50
25
50
VTT
50
Transmitter
Receiver
Cyclone III Device
Family Series OCT
VREF
VREF
VREF
VREF
Termination
50
50



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