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AN209

Using Terminator Technology in Stratix & Stratix GX Devices

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AN 209: Using Terminator Technology in Stratix & Stratix GX Devices

Figure 4. Terminator Technology Series-Parallel Termination

Driver with Series

Termination

External Resistor

Provided by User

VTT

RS

R T1

Z0

Receiver with Terminator

Technology Parallel Termination

VTT

R T2

VREF

Differential

Termination

(RD)

Terminator technology supports on-chip differential termination for

source-synchronous LVDS signalling. The differential termination

resistors are adjacent to the differential input buffers on the device. This

placement eliminates stub effects, improving the signal integrity of the

serial link. Using on-chip differential termination resistors also saves

board space. Figure 5 shows the differential termination connections for

Stratix and Stratix GX devices.

Figure 5. Terminator Technology Differential Termination

Differential

Transmitter

Differential Receiver with

Terminator Technology

LVDS Termination

Z0

RD

Z0

Altera Corporation

Differential termination for Stratix devices is supported for the left and

right I/O banks. Differential termination for Stratix GX devices is

supported for the left, source-synchronous I/O bank. Some of the clock

input pins are in the top and bottom I/O banks, which do not support

differential termination. External reference resistors are not required for

I/O banks that support differential termination. The value of on-chip

differential termination resistors is 100 Ω.

5

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