Altera Nios Development Board Cyclone II Edition - Manual (Page 50)

2–38 Reference Manual Altera Corporation
Nios Development Board Cyclone II Edition May 2007
Board Components
Flash Memory Partitions
The configuration controller expects user and factory configuration data
to be stored at fixed locations (offsets) in flash memory. In addition, the
factory-programmed reference design expects Nios II software and data
to exist at certain locations in flash memory.
Table 2–20 shows the
expected flash memory partitioning.
1 This partitioning scheme is merely a convention used by the
configuration controller and the factory-programmed reference
design. Custom FPGA designs can use the flash memory space
in any way necessary.
c
Altera recommends that you do not overwrite the factory-
programmed flash memory contents. Without a valid factory
configuration, the configuration controller may not be able to
successfully configure the FPGA. If you alter the factory
configuration, you can restore the board to its factory-
programmed state. Refer to Appendix B: Restoring the Factory
Configuration.
User Application Space
The lower 11 MB of flash memory is the user application space. This is
free space for user designs to store code and data for Nios II programs.
The Nios II IDE allows you to compile Nios II programs and program
them into the user application space.
Table 2–20. Flash Memory Partitions
Offset Usage Factory-Programmed Content
0x00000000 – 0x00BFFFFF User Application Space (11 MB)
0x00C00000 – 0x00CFFFFF User Configuration (1 MB)
0x00D00000 –0x00DFFFFFF Free Space (1 MB)
0x00E00000 – 0x00EFFFFF Factory Configuration (1 MB) Nios II Processor Reference
Design
0x00F00000 – 0x00FAFFFF Web Pages Web Pages
0x00FB0000 – 0x00FEFFFF Web Server Software Web Server Software
0x00FF0000 – 0x00FFFFFF Persistent Data Network Settings for Web Server