User guide

4–2 Chapter 4: Compiling and Simulating

Compiling the Design

External Memory Interface Handbook Volume 3 December 2010 Altera Corporation

Section II. DDR3 SDRAM Controller with ALTMEMPHY IP User Guide

2. You can either use the <variation_name>_pin_assignments.tcl or the

<variation_name>.ppf file to apply the I/O assignments generated by the

MegaWizard Plug-In Manager. Using the .ppf file and the Pin Planner gives you

the extra flexibility to add a prefix to your memory interface pin names. You can

edit the assignments either in the Assignment Editor or Pin Planner. Use one of the

following procedures to specify the I/O standard assignments for pins:

■ If you have a single SDRAM interface, and your top-level pins have default

naming shown in the example top-level file, run

<variation name>_pin_assignments.tcl.

■ If your design contains pin names that do not match the design, edit the

<variation name>_pin_assignments.tcl file before you run the script. To edit the .tcl

file, perform the following steps:

a. Open <variation name>_pin_assignments.tcl file.

b. Based on the flow you are using, set the

sopc_mode

value to Yes or No.

■ SOPC Builder System flow:

if {![info exists sopc_mode]} {set sopc_mode YES}

■ MegaWizard Plug-In Manager flow:

if {![info exists sopc_mode]} {set sopc_mode NO}

c. Type your preferred prefix in the

pin_prefix

variable. For example, to add the

prefix

my_mem

, do the following:

if {![info exists set_prefix}{set pin_prefix “my_mem_”}

After setting the prefix, the pin names are expanded as shown in the following:

■ SOPC Builder System flow:

my_mem_cs_n_from_the_

■ MegaWizard Plug-In Manager flow:

my_mem_cs_n[0]

1 If your top-level design does not use single bit bus notation for the

single-bit memory interface signals (for example,

mem_dqs

rather than

mem_dqs[0]

), in the Tcl script you should change

set

single_bit {[0]}

set

single_bit

{}