Hi,
while I'm configuring the FMC interface i come cross this memory map and i couldn't understand it. Does the FMC SDRAM Bank 1 have 4 possible regions? if yes, does SDRAM Bank 2 have the same option.
what about the External Memory region, are those for SRAMs and External Device for SDRAM?
those kinds of questions come to my mind, if someone could help me with.
most important question, I want to use SDRAM bank 1 (SDCKE 0 will be enabled) and SRAM1 (NE1 will be enabled), is this possible?
i believe i have read this somewhere that it could be done, but not sure, also, is there some sort of limitation of both can be enabled together or i should use SDRAM bank 2 and one of the SRam banks and that will be more reliable and efficient?
Thank you and best regards
1 ACCEPTED SOLUTION
Accepted Solutions
Hello @Skane ;
From the FMC point of view, the external memory is divided into fixed-size banks of 256 Mbytes each (see the below figure):
• Bank 1 is used to address up to 4 NOR flash memory or PSRAM devices. This bank is split into 4 NOR/PSRAM sub banks with 4 dedicated Chip Selects, as follows:
– Bank 1 - NOR/PSRAM 1
– Bank 1 - NOR/PSRAM 2
– Bank 1 - NOR/PSRAM 3
– Bank 1 - NOR/PSRAM 4
• Bank 2 is used for SDRAM device, SDRAM bank 1 or SDRAM bank 2 depending on BMAP bits configuration.
• Bank 3 is used to address NAND flash memory devices. The MPU memory attribute for this space must be reconfigured by software to Device.
• Bank 5 and 6 are used to address SDRAM devices (1 device per bank).
For each bank the type of memory to be used can be configured by the user application through the Configuration register.
The FMC effectively will only look at one memory at a time, not both at the same time.
Is my reply answer your request?
Thank you.
Kaouthar
Hello @Skane ;
From the FMC point of view, the external memory is divided into fixed-size banks of 256 Mbytes each (see the below figure):
• Bank 1 is used to address up to 4 NOR flash memory or PSRAM devices. This bank is split into 4 NOR/PSRAM sub banks with 4 dedicated Chip Selects, as follows:
– Bank 1 - NOR/PSRAM 1
– Bank 1 - NOR/PSRAM 2
– Bank 1 - NOR/PSRAM 3
– Bank 1 - NOR/PSRAM 4
• Bank 2 is used for SDRAM device, SDRAM bank 1 or SDRAM bank 2 depending on BMAP bits configuration.
• Bank 3 is used to address NAND flash memory devices. The MPU memory attribute for this space must be reconfigured by software to Device.
• Bank 5 and 6 are used to address SDRAM devices (1 device per bank).
For each bank the type of memory to be used can be configured by the user application through the Configuration register.
The FMC effectively will only look at one memory at a time, not both at the same time.
Is my reply answer your request?
Thank you.
Kaouthar
