I/O Pins Features For Cyclone V Devices; Open-Drain Output; Bus-Hold Circuitry - Altera Cyclone V Device Handbook

CV-52005
2014.01.10
Figure 5-12: Differential V
This figure shows the V
Table 5-27: Quartus II Software Assignment Editor—Programmable V
This table lists the assignment name for programmable V
Assignment Editor.
To
Assignment name
Allowed values
Related Information
Programmable IOE Features in Cyclone V Devices

I/O Pins Features for Cyclone V Devices

Open-Drain Output

Bus-Hold Circuitry

Pull-up Resistor
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.
Bus-Hold Circuitry
Each I/O pin provides an optional bus-hold feature that is active only after configuration. When the device
enters user mode, the bus-hold circuit captures the value that is present on the pin by the end of the
configuration.
I/O Features in Cyclone V Devices
Send Feedback
OD
of the differential LVDS output.
OD
Single-Ended Waveform
V
CM
Differential Waveform
V
OD
Field
on page 5-33
on page 5-33
on page 5-34
I/O Pins Features for Cyclone V Devices
Positive Channel (p)
V
OD
Negative Channel (n)
Ground
V (diff peak - peak) = 2 x V
OD OD
p - n = 0 V
V
OD
OD
and its possible values in the Quartus II software
OD
Assignment (Default setting in bold)
tx_out
Programmable Differential Output Voltage (V
00 (low), 01 (medium), 10 (high)
on page 5-29
(single-ended)
Altera Corporation
5-33
)
OD