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CDPCLK7 Scheda tecnica(PDF) 108 Page - Altera Corporation

Il numero della parte CDPCLK7
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

CDPCLK7 Scheda tecnica(HTML) 108 Page - Altera Corporation

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6–10
Chapter 6: I/O Features in the Cyclone III Device Family
OCT Support
Cyclone III Device Handbook
July 2012
Altera Corporation
Volume 1
Figure 6–4 shows the external calibration resistors setup on the RUP and RDN pins and
the associated OCT calibration circuitry.
RUP
and RDN pins go to a tri-state condition when calibration is completed or not
running. These two pins are dual-purpose I/Os and function as regular I/Os if you
do not use the calibration circuit.
On-Chip Series Termination Without Calibration
The Cyclone III device family supports driver impedance matching to the impedance
of the transmission line, which is typically 25  or 50 . When used with the output
drivers, OCT sets the output driver impedance to 25  or 50 . The Cyclone III device
family also supports output driver series termination (RS =50 ) for SSTL-2 and
SSTL-18
.
Figure 6–4. Cyclone III Device Family On-Chip Series Termination with Calibration Setup
Cyclone III Device Family OCT with
Calibration with RUP and RDN pins
OCT
Calibration
Circuitry
VCCIO
VCCIO
RUP
RDN
External
Calibration
Resistor
External
Calibration
Resistor
GND



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