using extra eeprom space

[Dave]

Hi,
I have a design using a spartanIIE and a xcs02f configuration eeprom. The
eeprom is 89% full (apparently it will always be that way even if I have a
larger design). I wonder if the fpga can use the extra 11% to store and read
data. I only need to store something like 10 bytes of data before the fpga
is powered off, and reading it back upon power up.

Rgds
Dave

 

[Jon Elson]

Dave wrote:

Hi,
I have a design using a spartanIIE and a xcs02f configuration eeprom. The
eeprom is 89% full (apparently it will always be that way even if I have a
larger design). I wonder if the fpga can use the extra 11% to store and read
data. I only need to store something like 10 bytes of data before the fpga
is powered off, and reading it back upon power up.


How will you erase what is in the EEPROM without erasing it all? Some

EEPROMS have
that capability, many don't. Any logic controlling this must be outside
the FPGA so
the FPGA can configure itself on power on.

Jon