STM32F429I SDRAM controller without byte select

[michkhol]

Posted on November 08, 2014 at 05:37

I waited for a 208 pin version for about a year and it is still not available (RUTRONIC now has 14 weeks wait time). So I want to try the STM32F429I (176 pins) for driving an RGB888 LCD with 32-bit SDRAM. It is ''kinda'' possible if I sacrifice byte select in the FMC controller. According to the manual I can live without it because a) read mode does not use it and b) for writing I can always align my data to a 4-byte boundary. The question is, will the SDRAM controller work with byte select disabled/uninitialized?

[Tesla DeLorean]

Posted on November 08, 2014 at 05:54

They all share the same die, so you could route to pins that don't exist, or simply mux a different AF to a given pin. I don't think the controller cares if outputs escape the part, or not.

[michkhol]

Posted on November 08, 2014 at 20:36

Thanks!