EP2AGX95EF29C6N Datasheet, PDF (248/380 Pages) Altera Corporation – Device Interfaces and Integration

8–2
Chapter 8: High-Speed Differential I/O Interfaces and DPA in Arria II Devices
LVDS Channels
f For specifications and features of the differential I/O standards supported in Arria II
devices, refer to the I/O Features in Arria II Devices and Arria II Devices Data Sheet
chapters.
LVDS Channels
In Arria II GX devices, there are true LVDS input buffers and LVDS I/O buffers at the
top, bottom, and right side of the device. The LVDS input buffers have 100- on-chip
differential termination (R_D OCT) support. You can configure the LVDS I/O buffers as
either LVDS input (without R_D OCT) or true LVDS output buffers. You can also
configure the LVDS pins on the top, bottom, and right sides of the device, as emulated
LVDS output buffers, which use two single-ended output buffers with an external
resistor network to support LVDS, mini-LVDS, and RSDS standards.
The Arria II GZ devices support LVDS on both row and column I/O banks. Row I/Os
support true LVDS input with 100- R_D OCT and true LVDS output buffers. Column
I/Os supports true LVDS input buffers without R_D OCT. You can also configure the
row and column LVDS pins as emulated LVDS output buffers that use two
single-ended output buffers with an external resistor network to support LVDS,
mini-LVDS, and RSDS standards. Arria II GZ devices offer single-ended I/O refclk
support for the LVDS.
Dedicated SERDES and DPA circuitries are implemented on the right I/O banks of
Arria II GX devices and row I/O banks of Arria II GZ devices to further enhance the
LVDS interface performance in the device. For column I/O banks in Arria II devices,
SERDES is implemented in the core logic because there is no dedicated SERDES
circuitry.
1 When you configure the I/O buffers as LVDS input with R_D OCT enabled, you must
set both V_CCIO and V_CCPD to 2.5 V.
f For more information about I/O banks, refer to the I/O Features in Arria II Devices
chapter.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
July 2012 Altera Corporation