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Page 6 Getting Started

DQ (ALTDQ) and DQS (ALTDQS) Megafunctions November 2010 Altera Corporation

Invert dqs_padio port (when

driving output)

When you select this option, the

dqs_padio

port is inverted, if driven as an output.

Yes Yes No No

Notes to Table 2:

(1) For supported DQS frequencies in these devices, refer to the “Cyclone II DDR Memory Support Overview” section of the External Memory

Interfaces in Cyclone II Devices chapter in volume 1 of the Cyclone II Device Handbook or the “Introduction” section of the External Memory

Interfaces in Cyclone III Devices chapter in volume 1 of the Cyclone III Device Handbook.

(2) For number of DQS/DQSn pair pins available in supported devices, refer to the External Memory Interfaces in Arria GX Devices chapter in volume

2 of the Arria GX Device Handbook, External Memory Interfaces in Cyclone II Devices chapter in volume 1 of the Cyclone II Device Handbook,

External Memory Interfaces in Cyclone III Devices chapter in volume 1 of the Cyclone III Device Handbook, External Memory Interfaces in Stratix

and Stratix GX Devices chapter in volume 2 of the Stratix Device Handbook, or the External Memory Interfaces in Stratix II and Stratix II GX

Devices chapter in volume 2 of the Stratix Device Handbook.

(3) The delay-locked loop (DLL) controls the delay chain settings to achieve a compensated delay for PVT. For example, you can use a DQS read

strobe or clock that is edge-aligned to its associated read data to clock the data into I/O registers if the data is delayed before reaching the

register. The DLL block computes the necessary delay settings by comparing the period of an input reference clock to the delay through an

internal delay chain. For more information about DLL, refer to the “DQS Phase-Shift Circuitry” section of the External Memory Interfaces in

Stratix and Stratix GX Devices chapter in volume 2 of the Stratix Device Handbook, External Memory Interfaces in Stratix II and Stratix II GX

Devices chapter in volume 2 of the Stratix Device Handbook, and External Memory Interfaces in Arria GX Devices chapter in volume 2 of the

Arria GX Device Handbook.

(4) For more information about the clock delay control block, refer to the “Clock Delay Control” section of the External Memory Interfaces in Cyclone

II Devices chapter in volume 1 of the Cyclone II Device Handbook.

(5) For Cyclone III, Cyclone III GX, and Cyclone III LS devices, you must use the "Input Delay from Dual-Purpose Clock Pin" assignment in the

Assignment Editor to set DQS clock delay.

(6) For more information about the DQS postamble circuitry, refer to the “DQS Postamble” section of the External Memory Interfaces in Cyclone II

Devices chapter in volume 1 of the Cyclone II Device Handbook.

Table 2. General Settings (Part 3 of 3)

Option Description

Supported Devices

Cyclone II

Cyclone III, Cyclone IV GX

Stratix, Stratix GX,

Stratix II, Stratix II GX, Arria GX, HardCopy II

1 2 3 4 5 6 7 8 9 10 11 ... 30 31

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