Honored ContributorHas anyone had problems or issues of the /SS lines glitching when being switch from one /SS to another? I have four slave devices and when I select a /SS line the previous /SS that was active glitches which is erasing the data within that SPI slave device.
Honored ContributorI was just looking into the SPI device. Do you have a capture of this? (I would like to see this). I'll run a test to see if I can cause this as well. Try pipelining that signal and if that doesn't work try debouncing using a few registers with their outputs going through an 'AND' (+ve chip select) or 'NOR' (-ve chip select) gate followed by another register (this is overkill so reduce the logic if you don't need this much debouncing).
Also are you using the function call 'alt_avalon_spi_command()' or your own implementation (for your problem it doesn't matter, I just want to know how to recreate this)? Email me so that I can get back to you sooner. CheersHonored Contributor<update>
I have finally got around to looking at this and it doesn't appear to be a bouncing signal, but the previous slave is being selected. If you have a SPI core in your SOPC system then you may want to determine if this is going to cause your logic some problems. If anyone needs a fix for this let me know and I'll provide it.Honored ContributorThis previous glitch is causing a problem. I would like to see Altera fix this with in the SPI peripheral itself and not have to come up with an external fix.
Honored ContributorI agree and this issue has been raised.
