EP1SGX10DF672C6 Datasheet, PDF (24/272 Pages) Altera Corporation – Section I. Stratix GX Device Family Data Sheet

Figure 2–10 shows a diagram of the receiver input buffer, which contains:
■ Programmable termination
■ Programmable equalizer
Figure 2–10. Receiver Input Buffer
Input
Pins
Programmable
Termination
Programmable
Equalizer
Differential
Input
Buffer
Programmable Termination
The programmable termination can be statically set in the Quartus II
software. Figure 2–11 shows the setup for programmable receiver
termination.
Figure 2–11. Programmable Receiver Termination
50, 60, or 75 Ω
V_CM
Differential
Input
Buffer
50, 60, or 75 Ω
If you use external termination, then the receiver must be externally
terminated and biased to 1.1 V. Figure 2–12 shows an example of an
external termination/biasing circuit.
2–14
Stratix GX Device Handbook, Volume 1
Altera Corporation
June 2006