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EP4CE40 Datasheet(PDF) 116 Page - Altera Corporation

Part # EP4CE40
Description  Cyclone IV Device Handbook, Volume 1
PDF  488 Pages
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP4CE40 Datasheet(HTML) 116 Page - Altera Corporation

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6–10
Chapter 6: I/O Features in Cyclone IV Devices
OCT Support
Cyclone IV Device Handbook,
May 2013
Altera Corporation
Volume 1
Figure 6–3 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
Cyclone IV devices support driver impedance matching to match the impedance of
the transmission line, which is typically 25 or 50
Ω. When used with the output
drivers, OCT sets the output driver impedance to 25 or 50
Ω. Cyclone IV devices also
support I/O driver series termination (RS = 50 Ω) for SSTL-2 and SSTL-18.
Figure 6–3. Cyclone IV Devices RS OCT with Calibration Setup
Cyclone IV 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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