Specifications

Figure 5-11: Differential V
OD
This figure shows the V
OD
of the differential LVDS output.
Single-Ended Waveform
Positive Channel (p)
Negative Channel (n)
Ground
Differential Waveform
p - n = 0V
V
CM
V
OD
V
OD
V
OD
V
OD
(diff peak - peak) = 2 x V
OD
(single-ended)
Table 5-27: Quartus II Software Assignment Editor—Programmable V
OD
This table lists the assignment name for programmable V
OD
and its possible values in the Quartus II software
Assignment Editor. Value "0" is available for the RSDS and mini-LVDS I/O standards only, and is not available for
the LVDS I/O standard.
Assignment (Default setting in bold)Field
tx_out
To
Programmable Differential Output Voltage (V
OD
)Assignment name
00 (low), 01 (medium), 10 (high)Allowed values
Related Information
Programmable IOE Features in Cyclone V Devices on page 5-28
I/O Pins Features for Cyclone V Devices
Open-Drain Output on page 5-32
Bus-Hold Circuitry on page 5-33
Pull-up Resistor on page 5-33
Open-Drain Output
The optional open-drain output for each I/O pin is equivalent to an open collector output. If it is configured
as an open drain, the logic value of the output is either high-Z or logic low.
Use an external resistor to pull the signal to a logic high.
I/O Features in Cyclone V Devices
Altera Corporation
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I/O Pins Features for Cyclone V Devices
5-32
2013.06.21