NIOS II addressing problem

If you are looking at the address coming from Nios, remember that the databus is 32-bits wide. Assuming your peripheral is 16-bits wide, the Avalon Switch Fabric is taking care of the bus-width matching for you. Therefore, if you really want to see the low order address bits, you'll be better off examining the address at the peripheral.

BTW, I assume you have no data cache in your system. Otherwise, these accesses will be cached, and the accesses won't make it to your peripheral as anticipated.

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originally posted by richy759@Dec 8 2006, 09:30 AM

this is not the case however. address bit 1 is 1 when i do a write but when i read, address 1 is 0.

bearing in mind these are the nios address lines and not mine.

has anyone come across this before or have any idea what the problem may be?

many thanks,

richard

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