ep1agx50d Altera Corporation, ep1agx50d Datasheet - Page 20

• Manufacturer Part Number: ep1agx50d
• Description: Arria Gx Device Data Sheet
• Manufacturer: Altera Corporation

Transceivers
Figure 2–9. Differential Signaling
2–12
Arria GX Device Handbook, Volume 1
V
= V
OD
high
(Differential)
Complement
−
V
low
True
Single-Ended Waveform
Differential Waveform
Programmable Pre-Emphasis
The programmable pre-emphasis module controls the output driver to
boost high frequency components and compensate for losses in the
transmission medium, as shown in
statically using the ALTGXB megafunction.
Figure 2–10. Pre-Emphasis Signaling
Pre-emphasis percentage is defined as (V
V
the differential steady-state voltage (peak-to-peak).
MAX
is the differential emphasized voltage (peak-to-peak) and V
Pre-Emphasis % = (
+V
OD
V
V
high
low
V
+V
2 * V
MAX
-
OD
OD
V
V
V
MAX
MIN
Figure
MIN
− 1) × 100
MAX
2–10. Pre-emphasis is set
/V
MIN
-V
– 1) × 100, where
OD
Altera Corporation
+400
0-V Differential
−400
May 2008
MIN
is