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Altera_Forum
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22 years ago

sdram transfer

We have tested block transfer in sdram with memcpy() fonction on développement kit stratix 1S10 NIOS II with uclinux v1.1. The frequency CPU is 50Mhz. We obtained with nois ii /s (no data cac...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
22 years ago

Hi Fred,

Here are some preliminary results.

I modified your source to use nr_timer_milliseconds() instead of gettimeofday(), but that is all. I additionally added dmaMemcpy() and dmaMemcpy4() to test dma transfers.

Here is the summary.

The system is NiosI with single Micron 4Mx32 sdram @75MHz 2K I-cache, 0K D-cache.

memcpy() 10.4-10.7MB/s

dma1() 8.6-9.1MB/s

dma4() 30.3-35.5MB/s

Kind of dissapointing considering I've read we should be able to get roughly one transfer per clock in burst. I wonder if we're missing some setting?

I'll try to get the Nios2 results today as well.

Ken