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Altera_Forum
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12 years ago

Increasing the speed of consecutive IOWR functions

Hi everyone, I have a dsp builder system and registers on it. When I want to write these register from NIOS by using IOWR function, there are about 30 clock cycles between two consecutive com...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

If the avalon slave isn't a 32bit slave you'll have a bus width adapter that converts the 32bit cycle into (say) four 8bit ones (with the byte enable set appropriately). If you have a clock crossing bridge as well it can get very slow.

Also make sure you've compiled everything with optimisation enabled (-O2 or -O3) otherwise the code itself will get large.