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Altera_Forum's avatar
Altera_Forum
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21 years ago

SDRAM does not retain data

I have a custom board with an altera EP1C12, a flash memory and a MT48LC4M32B2 SDRAM memory. Timings I set in SOPC builder are the default timings for this part. When I set the value 0x00000000 ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Are you using a data cache? If so, you should be using the IO macros and/or the bit 31 override to circumvent the cache.

Alternately, you can use alt_uncached_malloc, which will return a pointer to an uncached location in memory. There are examples of this exact usage in the memtest software example.

Cheers,

- slacker