STM32F4 PSRAM configuration

[ad23]

Posted on September 03, 2014 at 10:26

Hello,

At the moment I am designing a PCB with the STM32F4 and PSRAM. Are the FSMC_NEx signals the bank switch signals? Can I use all the FSMC_NEx signals for the PSRAM or are certain banks only for a certain memory (NOR, NAND, etc.)? I use FSMC_NE3 for the CE. Can I use the FSMC_NE1 instead? What can I do with the ZZ signal (Sleep enable) of the PSRAM? Must I connect this PSRAM input to a I/O or a FSMC_? signal? Which FSMC_? signal? Thank you very much for your help. Kind regards, Ad Ps. Example/reference STM32 schematics are also welcome.

 

#stm32f4-fsmc-psram

[balmukund66]

Posted on September 04, 2014 at 08:10 Hello , Yes,FSMC_NEx signals the bank switch signals. FSMC_NE1  to FSMC_NE4 can be used to select NOR as well as PSRAM. But based on this chip select the Memory region will change(Please select the memory region accordingly.0x6000 0000h to 0x6FFF FFFFh are the region for four equal banks,can be calculated accordingly). Please connect the ZZ signal to GPIO and handle it seperately. Thanks & Regards, Balmukund Prasad