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Altera_Forum's avatar
Altera_Forum
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15 years ago

Byteeneables

hello, i wanted to whether adding byteenable signals to your sopc costum components is a must do. im working on a small system, interfacing my slave components to the main cpu's masters, i havent mad...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Your slave needs to be a 32bit slave, otherwise the SOPC builder will silently add a bus width adapter and then do multiple slave cycles for each Nios master cycle.

Even with a 32bit slave you should look at the byte enables, since if you ever connect the the PCIe bridge you'll discover it always generates two 32bit cycles - even when one of them has all the byte enables inactive (surely Altera could modify the bus width adapter to avoid such cycles?).