Altera Stratix GX Transceiver - Manual (Page 21)

Altera Corporation 2–3
January 2005 Stratix GX Transceiver User Guide
Stratix GX Analog Description
Programmable Voltage Output Differential (V
OD
)
Stratix GX transceivers let you customize the differential output voltage
(V
OD
) to handle different length, backplane, and receiver requirements
(see Figure 2–3 ). You can select the V
OD
(differential) from a range of 400
to 1,600 mV, as shown in Table 2–1 .
Figure 2–3. V
OD
(Differential) Signal Level
Table 2–1 shows the differential output voltage (V
OD
) setting per current
level for each of the on-chip transmitter programmable termination
values.
Single-Ended Waveform
Differential Waveform (VOD (Differential) = 2 x VOD (single-ended))
Positive Channel (p) = V
OH
Negative Channel (n) = V
OL
Ground
V
OD
V
OD
V
OD
p − n = 0 V
V
CM
Table 2–1. Programmable V
O D
(Differential)
100 Ω (mV) 120 Ω (mV) 150 Ω (mV)
400 480 600
800 960 1,200
1,000 1,200 1,500
1,200 1,440
1,400
1,600