Avalon Speed

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originally posted by fplank@Sep 18 2006, 09:31 AM

hello

can anybody give me a iead how fast a avalon bus works.

i designed a hardwar which gets data from the software via the avalon bus. i write via the iowr on the bus. this is a very time critical part.

so my question how fast is a write on the avalon bus about. i can i achiev a higher speed.

thanks

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Assuming no other masters are attempting to access your designation (and no wait states either) then the numbers shown in here should tell you how fast your writes are:

http://www.altera.com/literature/hb/nios2/n2cpu_nii5v1.pdf (http://www.altera.com/literature/hb/nios2/n2cpu_nii5v1.pdf)

By the way, can you use a DMA in your system? If so then you may achieve better efficiency using it. With a DMA, a destination memory that has a write latency = 0, and no other masters accessing the destination you should be able to achieve a write every clock cycle assuming no wait states occur. I recommend taking a look at this document to learn more about how the switch fabric works:

http://www.altera.com/literature/manual/mnl_avalon_spec.pdf (http://www.altera.com/literature/manual/mnl_avalon_spec.pdf)