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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

Transceiver

Termination

f

Reference

Resistors

Stratix GX devices feature built-in on-chip termination within the

transceiver at both the transmit and receive buffers. This termination

improves signal integrity and provides support for the 1.5-V PCML I/O

standard.

See AN 237: Using High-Speed Transceiver Blocks in Stratix GX Devices for

more information on transceiver termination.

Connect the two reference resistors (RUP and RDN) to the two dual-

purpose reference pins per I/O bank. RUP is a pull-up resistor and is

connected to the VCCIO of that I/O bank. RDN is a pull-down resistor and

is connected to GND of that I/O bank. Figure 6 below shows the reference

resistor connections.

Figure 6. Terminator Reference Resistor Connections

VCCIO

Device

R UP

R DN

GND

Table 3 shows the external reference resistor values for different types of

terminations.

Table 3. External Reference Resistance Values Note (1)

Termination Type

Impedance Matching

Series Termination

Parallel Termination

Differential Termination

Impedance (Ω)

25

50

25

50

100

RUP/RDN

10 × Z0

10 × Z0

10 × Z0

20 × Z0

Not needed

Note to Table 3:

(1) Z0 is the target on-chip impedance.

6

Altera Corporation

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