Altera ALTDLL Uživatelský manuál stáhnout pdf (Strana 90)

Chapter 4: Functional Description 4–54

Design Example: Implementing Half-Rate DDR2 Interface in Stratix III Devices

12. Click Finish. The dq_dqs_inst module (dq_dqs_inst.v) is generated.

Instantiate the ALTIOBUF Megafunction

After instantiating the ALTDLL and ALTDQ_DQS megafunctions, you must

instantiate the ALTIOBUF megafunction with the following I/O buffer settings:

■ 1 bidirectional buffer for the differential DQS pins

■ 1 output buffer for the output DQ pins

■ 8 bidirectional buffers for the bidirectional DQ pins

To instantiate these three types of I/O buffers, perform the following steps:

1. In the Quartus II software, on the Tools menu, click MegaWizard Plug-In

Manager.

2. On page 1, select Create a new custom megafunction variation. Click Next. Page

2a appears.

3. On page 2a, select or verify the configuration settings shown in Table 4–34. Click

Next to advance from one page to the next.

4. On the Parameter Settings page, specify the parameters as shown in Table 4–35.

These parameters configure the general settings for the ALTIOBUF instance.

Create ‘output_dq_sreset’ input port Turned off

Create ‘bidir_dq_areset’ input port Turned on

Create ‘bidir_dq_sreset’ input port Turned on

Create 'config_clk' input port Turned on

Create 'config_datain' input port Turned on

Create 'config_update' input port Turned on

Table 4–33. Advanced Options (Reset and Config Ports) (Part 2 of 2)

Parameter Value

Table 4–34. ALTIOBUF Configuration Settings

Settings

Value

1 bidirectional buffer for

the differential DQS pins

1 output buffer for the

output DQ pins

8 bidirectional buffers for

the bidirectional DQ pins

Which device family will you be

using?

Stratix III Stratix III Stratix III

Which megafunction would you like to

customize?

ALTIOBUF ALTIOBUF ALTIOBUF

Which type of output file do you want

to create?

Verilog HDL Verilog HDL Verilog HDL

What name do you want for the output

file?

dqs_iobuf_inst.v output_dq_iobuf_inst.v bidir_dq_iobuf_inst.v

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 116 117

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