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Altera_Forum
Honored Contributor
Honored ContributorDDR vs. SDR RAM...
Anyone know if DDR Ram will fare better with the NiosII data master than SDRAM? After Dirk figured out it takes a whopping 12 clocks @50MHz (~240ns) per SDRAM read when not using the dma, we re...
Altera_ForumHonored Contributor
Honored ContributorThe SDRAM controller included in the Nios II kit only keeps one bank open at a time.
The DDR controller from Altera keeps multiple banks open. This should help improve performance but is a function of your access pattern. The main problem with the Nios II/f data cache and DRAM performance (SDRAM or DDR) is that it only has a 4-byte line so it doesn't perform burst transfers to/from the DRAM.
