About this megafunction, Features, Device support – Altera Dynamic Calibrated On-Chip Termination User Manual
Page 4: Chapter 1. about this megafunction, Features –1 device support –1
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