Altera Dynamic Calibrated On-Chip Termination Manual de usuario Pagina 4

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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
®
V
HardCopy
®
III
HardCopy IV
Stratix
®
III
Stratix IV
Stratix V
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