EP4SE360F35I4 Datasheet, PDF (220/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

6–46
Chapter 6: I/O Features in Stratix IV Devices
Design Considerations
Mini-LVDS
Stratix IV devices support the mini-LVDS output standard with data rates up to
340 Mbps using LVDS output buffer types. For transmitters, use two single-ended
output buffers with external one- or three-resistor networks, as shown in Figure 6–35.
The one-resistor topology is for data rates up to 200 Mbps. The three-resistor topology
is for data rates above 200 Mbps. The row I/O banks support mini-LVDS output using
true LVDS output buffers without an external resistor network.
Figure 6–35. Mini-LVDS I/O Standard Termination ⁽¹⁾
Termination
One-Resistor Network (mini-LVDS_E_1R)
Three-Resistor Network (mini-LVDS_E_3R)
External
On-Board
Termination
OCT
Transmitter
Transmitter
≤1 inch
RP
50 Ω
100 Ω
50 Ω
Receiver
≤1 inch
RP
50 Ω
50 Ω
Stratix IV OCT
100 Ω
Receiver
Transmitter
Transmitter
≤1 inch
RS
RP
RS
50 Ω
100 Ω
50 Ω
Receiver
≤1 inch
RS
RP
RS
50 Ω
50 Ω
Stratix IV OCT
100 Ω
Receiver
Note to Figure 6–35:
(1) The R_S and R_P values are pending characterization.
A resistor network is required to attenuate the LVDS output voltage swing to meet the
mini-LVDS specifications. You can modify the three-resistor network values to reduce
power or improve noise margin. The resistor values chosen must satisfy Equation 6–1
on page 6–45.
1 Altera recommends that you perform additional simulations using IBIS models to
validate that custom resistor values meet the RSDS requirements.
f For more information about the mini-LVDS I/O standard, see the mini-LVDS
Specification from the Texas Instruments website at www.ti.com.
Design Considerations
Although Stratix IV devices feature various I/O capabilities for high-performance
and high-speed system designs, there are several other design considerations that
require your attention to ensure the success of your designs.
I/O Bank Restrictions
Each I/O bank can simultaneously support multiple I/O standards. The following
sections provide guidelines for mixing non-voltage-referenced and voltage-referenced
I/O standards in Stratix IV devices.
Stratix IV Device Handbook
Volume 1
September 2012 Altera Corporation