Altera ALTDLL Instrukcja Użytkownika Pobierz pdf (Strona 13)

2–7 Chapter 2: Getting Started

Design Example: Implementing Read Paths Using Stratix III Devices

ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation

8. On the DLL Offset Controls/Optional Ports page, specify the parameters as

shown in Table 2–4.

9. Click Finish.

10. Click Finish. The ALTDLL instance is generated.

11. Click OK to close the Symbol window.

12. Place the instance on the Block Editor.

Generate the ALTDQ_DQS Megafunction

To generate the ALTDQ_DQS megafunction, perform the following steps:

1. Double-click anywhere on the Block Editor window. The Symbol window appears.

2. Click MegaWizard Plug-In Manager. Page 1 of the MegaWizard Plug-In Manager

appears.

3. Select Create a new custom megafunction variation.

4. Click Next. Page 2a of the MegaWizard Plug-In Manager appears. Select

ALTDQ_DQS, and Verilog HDL, and type the file name as dq_dqs_input_path.v.

5. On the Parameter Settings page, specify the parameters as shown in Table 2–5.

These parameters configure the general settings for the ALTDQ_DQS instance.

DQS Delay Buffer Mode Low

Refer to Stratix III Device Datasheet: DC and

Switching Characteristics of Stratix III Devices

chapter in the Stratix III Device Handbook, and

pick a DLL mode that supports 150 MHz and

find the DLL setting.

Input Clock Frequency 150 MHz

Turn on jitter reduction Turned off.

Table 2–4. ALTDLL Parameter Settings/DLL Offset Controls/Optional Ports Settings

Settings Value

DLL Phase Offset Control A

Instantiate dll_offset_ctrl block

Turned off.

The design is intended to run slow, so you do

not need to select this parameter. However, if

the read timing is unbalanced, you can

fine-tune the DQS phase shift using this

parameter.

DLL Phase Offset Control B

Instantiate dll_offset_ctrl block

Turned off.

Optional Ports

Create a dll_aload port

Turned off.

Optional Ports

Create a dll_dqsupdate port

Turned off.

Table 2–3. ALTDLL GeneraL Settings

Settings Value

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 116 117

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