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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

■ HardCopy

III

■ HardCopy IV

■ Stratix

III

■ Stratix IV

■ Stratix V

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Altera Dynamic Calibrated On-Chip Termination Manuale Utente Pagina 4