EP4SE360F35I4 Datasheet, PDF (219/432 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

Chapter 6: I/O Features in Stratix IV Devices
Termination Schemes for I/O Standards
6–45
RSDS
Stratix IV devices support the RSDS output standard with data rates up to 230 Mbps
using LVDS output buffer types. For transmitters, use two single-ended output
buffers with the external one- or three-resistor networks in the column I/O bank, as
shown in Figure 6–34. 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
RSDS output using true LVDS output buffers without an external resistor network.
Figure 6–34. RSDS I/O Standard Termination ⁽¹⁾
Termination
External
On-Board
Termination
OCT
One-Resistor Network (RSDS_E_1R)
≤1 inch
RP
50 Ω
50 Ω
100 Ω
Transmitter
Receiver
≤1 inch
RP
50 Ω
50 Ω
Stratix IV OCT
100 Ω
Transmitter
Receiver
Three-Resistor Network (RSDS_E_3R)
Transmitter
Transmitter
≤1 inch
RS
RP
RS
50 Ω
50 Ω
100 Ω
Receiver
≤1 inch
RS
RP
RS
Stratix IV OCT
50 Ω
50 Ω
100 Ω
Receiver
Note to Figure 6–34:
(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
RSDS 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.
Equation 6–1.
-^R----^s----^-----^R-----2----^p--- = 50
Rs
+
R_-----p-
2
1 Altera recommends performing additional simulations using IBIS models to validate
that custom resistor values meet the RSDS requirements.
f For more information about the RSDS I/O standard, refer to the RSDS Specification
from the National Semiconductor website at www.national.com.
September 2012 Altera Corporation
Stratix IV Device Handbook
Volume 1