Altera DQ (ALTDQ) Uživatelský manuál stáhnout pdf (Strana 12)

Page 12 Getting Started

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

Page 8 of the ALTDQS MegaWizard Plug-In Manager is the DQS/nDQS Delay Chain

page. Table 7 on page 12 describes options available on page 8 of the ALTDQS

megafunction.

Page 9 of the MegaWizard Plug-In Manager is the EDA page. This page lists the

simulation model files needed to simulate the generated design files. On this page,

you can enable the Quartus II software to generate a synthesis area and timing

estimation netlist for this megafunction for use by third-party tools.

Page 10 of the MegaWizard Plug-In Manager is the Summary page. On this final

page, the wizard displays a list of the types of files to be generated. The automatically

generated Variation file contains wrapper code in the language you specified on page

2a. On this page, you can specify additional types of files to be generated. Choose

from the AHDL Include file (<function name>.inc), VHDL component declaration file,

Table 7. DQS/nDQS Delay Chain Port Settings

Option Description

Device Supported

Cyclone II

Cyclone III, Cyclone III GX, Cyclone III LS

Stratix, Stratix GX,

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

Offset options for DQS/nDQS

delay chain

Allows tuning of the DQS delay chain. Depending on

settings from wizard page 4, the offset applies either a

coarse or fine delay. (1)

When a static delay is added, the value of delay is

equivalent to offset value multiplied by coarse or fine offset

buffer delay. If a dynamic delay is selected, a

dll_offset

port is added to the megafunction. The unsigned integer

values on

dll_offset

port may then be added,

subtracted, or dynamically controlled with a

dll_addsub

port by selecting one of the options. For static offset, the

value is added to the DLL feedback counter and output on

the

dll_delayctrlout

output bus. The legal integer

values are –63 to 63.

No No No Yes

Enable the latches for the DQS

delay chain setting (2)

These latches ensure that the offset value is not changed

while the DQS transitions, and also determines whether the

DQS delay buffer control signals are latched or not.

No No No Yes

Create reset for the DLL If enabled, a reset input is added to clear the DLL. No No No Yes

Note to Table 7:

(1) For more information, refer to Table 3 on page 7.

(2) For more information about utilizing the offset, refer to AN550: Using the DLL Phase Offset Feature in Stratix II and HardCopy II Devices.

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