Arria GX Architecture
Figure 2–8. Output Buffer
Serializer
Output Buffer
Programmable
Pre-Emphasis
Output
Pins
Programmable
Output
Driver
Programmable Output Driver
The programmable output driver can be set to drive out differentially 400
to 1200 mV. The differential output voltage (VOD) can be statically set by
using the ALTGXB megafunction.
The output driver may be configured using 100 Ω on-chip termination or
external termination.
Differential signaling conventions are shown in Figure 2–9. The
differential amplitude represents the value of the voltage between the
true and complement signals. Peak-to-peak differential voltage is defined
as 2 (VHIGH – VLOW) = 2 single-ended voltage swing. The common mode
voltage is the average of VHIGH and VLOW
.
Altera Corporation
May 2008
2–11
Arria GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
