Figure 2–7. VOD Differential
Single-Ended Waveform
Positive Channel (p) = V
OH
V
ID
Negative Channel (n) = V
Ground
OL
V
CM
Differential Waveform
(V (Differential) = 2 x V (single-ended))
ID
ID
V
ID
p − n = 0 V
V
ID
Programmable Pre-Emphasis
The programmable pre-emphasis module controls the output driver to
boost the high frequency components, to compensate for losses in the
transmission medium, as shown in Figure 2–8. The pre-emphasis can be
dynamically or statically set. There are five possible pre-emphasis
settings (1 through 5), with 5 being the highest and 0 being no
pre-emphasis.
Figure 2–8. Programmable Pre-Emphasis Model
V
PP
V
S
V
V (p-p)
V
(p-p)
PP
CM
S
Bit
Time
Bit
Time
2–12
Stratix GX Device Handbook, Volume 1
Altera Corporation
June 2006
ALTERA [ ALTERA CORPORATION ]
