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How to do 8-bit wide write with FMC?

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hamidkavianathar

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Hey there
I am using an custom board which has a stm32h743. I want to send data to an fpga with FMC bus. I know that FMC in stm32h7 is a 74-bit bus. In stm32cube I have configure 8-bit data and 8-bit address in SRAM mode. when I issue a 8-bit write it performs sequentially 8 time write. but I only want to do write only once. could you please tell me how I can do that?
I also have another question, When I enable Dcache and Icache, the FMC does not write to external device. is it possible to disable the cache of FMC?

thanks in advance.
 

You really need to show us your code so that we can see what you have done.
I can only guess but you probably have not configured the FMC correctly.
Can you explain what you mean by a 74-bit bus? Are you counting all of the address, data and the various control signals together or what?
Susan
 

If you write 64 bit data objects to the 8 bit interface, it's split in eight writes. If you write 8 bit objects, it's done in a single write.
 

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