Altera DE2 Board Getting Started Manual page 71

You need to ERASE entire Flash memory before you can write to it. Remember
that the number of time a Flash memory can be erased is limited.
The time required to erase entire Flash memory is 15 secs - 21 secs. Please
do not close the DE2 Control Panel in the middle of operation
Follow the steps to exercise the operations to the Flash memory:
1. Click on Button Flash to change to Flash Memory Control Page (Refer to
Figure 11.4).
Figure 11.4. Flash Memory Control Page
2. Click on Chip Erase. The button and window frame title will prompt you to
wait until the operation is finished. It will take around 24 secs to finish the
operation.
3. Please refer to Figure 11.5. Key in a random address (0x1688 in the
example) and value in wDATA field (0x125 in the example ). Click on Write
will write 0x125 to address 0x1688.
4. Key in the address and click on Read. The rDATA will display the data read
back from the address specified.
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Lab 7: DE2 Control Panel