Altera Dynamic Calibrated On-Chip Termination - Manual (Page 4)

February 2012 Altera Corporation Dynamic Calibrated On-Chip Termination (ALTOCT) Megafunction
User Guide
1. About this Megafunction
The Dynamic Calibrated On-Chip Termination (ALTOCT) megafunction is used in
double-data rate (DDR) external memory interfaces. This megafunction is closely
associated with the External DDR Memory PHY Interface (ALTMEMPHY)
megafunction. On-chip termination (OCT) improves signal quality over external
termination through reduced parasitic, board space, and external component costs.
Features
The ALTOCT megafunction provides the following features:
■ Support for up to 10 OCT blocks
■ Support for calibrated on-chip series termination (RS) and calibrated on-chip
parallel termination (RT) on all I/O pins
■ Calibrated termination values of 25 and 50 ohm
Device Support
TheALTOCT megafunction supports the following Altera ® devices:
■ Arria ® II GX
■ Arria II GZ
■ Arria V
■ Cyclone ® V
■ HardCopy ® III
■ HardCopy IV
■ Stratix ® III
■ Stratix IV
■ Stratix V