Figure 2–10 shows a diagram of the receiver input buffer, which contains:
■
■
Programmable termination
Programmable equalizer
Figure 2–10. Receiver Input Buffer
Programmable
Termination
Input
Pins
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
Differential
Input
Buffer
50, 60, or 75 Ω
V
CM
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
ALTERA [ ALTERA CORPORATION ]
