EP4SE360F35I4 Datasheet, PDF (217/432 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
6–43
LVDS
The LVDS I/O standard is a differential high-speed, low-voltage swing, low-power,
general-purpose I/O interface standard. In Stratix IV devices, the LVDS I/O standard
requires a 2.5-V V_CCIO level. The LVDS input buffer requires 2.5-V V_CCPD. Use this
standard in applications requiring high-bandwidth data transfer, such as backplane
drivers and clock distribution. LVDS requires a 100- termination resistor between
the two signals at the input buffer. Stratix IV devices provide an optional 100-
differential termination resistor in the device using on-chip differential termination.
Figure 6–31 shows LVDS termination. The on-chip differential resistor is only
available in the row I/O banks.
Figure 6–31. LVDS I/O Standard Termination ⁽¹⁾
Termination
Differential Outputs
LVDS
Differential Inputs
External On-Board
Termination
50 Ω
50 Ω
100 Ω
Differential Outputs
Differential Inputs
OCT Receive
(True LVDS
Output)
(2)
50 Ω
50 Ω
100 Ω
Stratix IV OCT
OCT Receive
(Single-Ended
LVDS Output
with One-Resistor
Network,
LVDS_E_1R)
(3)
Single-Ended Outputs
≤ 1 inch
50 Ω
Rp
50 Ω
External Resistor
Differential Inputs
100 Ω
Stratix IV OCT
OCT Receive
(Single-Ended
LVDS Output
with Three-Resistor
Network,
LVDS_E_3R)
(3)
Single-Ended Outputs
≤ 1 inch
Rs
Rp
Rs
50 Ω
50 Ω
External Resistor
Differential Inputs
100 Ω
Stratix IV OCT
Notes to Figure 6–31:
(1) For LVDS output with a three-resistor network, the R_S and R_P values are 120 and 170 , respectively. For LVDS output with a one-resistor network, the
R_P value is 120 .
(2) Side I/O banks support true LVDS output buffers.
(3) Column and side I/O banks support LVDS_E_1R and LVDS_E_3R I/O standards using two single-ended output buffers.
September 2012 Altera Corporation
Stratix IV Device Handbook
Volume 1