Guideline: Adhere To The Lvds I/O Restrictions And Differential Pad Placement Rules; I/O Banks Locations In Cyclone V Devices - Altera Cyclone V Device Handbook

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Perform IBIS or SPICE simulations to make sure the overshoot and undershoot voltages are within

the specifications.

Transmitter Application

If you use the Cyclone V device as a transmitter, use slow slew-rate and series termination to limit the

overshoot and undershoot at the I/O pins. Transmission line effects that cause large voltage deviations at

the receiver are associated with an impedance mismatch between the driver and the transmission lines. By

matching the impedance of the driver to the characteristic impedance of the transmission line, you can

significantly reduce overshoot voltage. You can use a series termination resistor placed physically close to

the driver to match the total driver impedance to the transmission line impedance.

Receiver Application

If you use the Cyclone V device as a receiver, use the on-chip clamping diode to limit the overshoot and

undershoot voltage at the I/O pins.

Related Information

Cyclone V Device Datasheet

Guideline: Adhere to the LVDS I/O Restrictions and Differential Pad Placement Rules

For Cyclone V LVDS applications, adhere to these guidelines to avoid adverse impact on LVDS performance:

I/O restrictions guideline—to avoid excessive jitter on the LVDS transmitter output pins.

Differential pad placement rule for each device—to avoid crosstalk effects.

Related Information

Cyclone V Device Family Pin Connection Guidelines

Describes the I/O restriction guidelines for the Cyclone V LVDS transmitters.

Cyclone V Differential Pad Placement Rule and Pad Mapping Files

Provides the pad mapping spreadsheets for Cyclone V devices.

The number of Cyclone V I/O banks in a particular device depends on the device density.

The availability of I/O banks in device packages varies. For more details, refer to the related links.

I/O Features in Cyclone V Devices

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Guideline: Adhere to the LVDS I/O Restrictions and Differential Pad Placement Rules

Altera Corporation

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