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Scholar mrbietola
Scholar
2,553 Views
Registered: ‎05-31-2012

Same time to write to DDR or to BRAM from Microblaze?

i'm trying to speed up microblaze write operations to do some graphics

I attached a BRAM to the AXI interconnect and a DDR memory controller.

Writing to the DDR or the BRAM takes the same time, is it normal?

I thought that writing in the BRAM was much faster!

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Scholar stephenm
Scholar
2,543 Views
Registered: ‎05-06-2012

Re: Same time to write to DDR or to BRAM from Microblaze?

How are you measuring this. You can estimate the expected latency from the DDR data sheet. The BRAM should take only a few ticks
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Scholar mrbietola
Scholar
2,530 Views
Registered: ‎05-31-2012

Re: Same time to write to DDR or to BRAM from Microblaze?

in a c program, i use a for cycle to initialize some memory locations, with a timer i measure the time to get the for cycle completed

 

I have to draw text strings, i thought that if i put the font in the BRAM the write process was much faster, but it wasn't

 

i need a way to draw graphics much faster!

to delete it i use a CDMA that blanks all the graphic memory buffer and it's ok

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