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Altera_Forum
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20 years ago

Sharing data and address between SDRAM and Flash

Hello, Due to some limitation in the amount of IO pins SDRAM and Flash have to share the same address and data bus. Are there any differences between connecting the Flash to a separate tri-stat...
Altera_Forum's avatar
Altera_Forum
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20 years ago

NIIUser,

You're correct about A0 being the byte addressing bit, for the flash, but the current implementation of the SDRAM controller makes use of all address bits from A0-An, regardless of whether it's in tristate mode or not.

So, if you're in a situation where you have all 16 bit wide devices on the tristate bus, you'd still have to route A0 to the SDRAM. Please keep this in mind if you're implementing this on a board.

Best Regards,

- slacker