Rearrange the address pin and BAx pins when routing the SDRAM to STM32

[diverger]

I'm layout a SDRAM to STM32F767. For convenience to layout the tracks, I want to rearrange the address and BAx lines as above. I've never done SDRAM with STM32, so I wonder if it will work well to do this?

Thanks.

[waclawek.jan]

Look at how the SDRAM works, concentrate on the commands.

JW

[berendi · Accepted solution]

Not going to work.

As JW has noted, commands won't work. This might perhaps be solved by likewise rearranging the bits in the command word.

Moreover, rearranging the address bits would make your memory non-contiguous and partially inaccessible. Note that the column address doesn't use A11-A12.

Swapping the banks could work.