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Is there an exposed buss for

Is there an exposed buss for address and data or are you restricted to being on the other side of I/O registers?  With the speeds of SPI you might be able to use SPI to replace  parallel access.


Yes.  According to my help, the FSMC peripheral allows direct mapping of external memories into the address space such as SRAM and Flash and on the F4 chip, it includes SRAM.
I did google STM32 and HDMI and I think there is future for this chip and there are 1.6 Ghz dual core ARM chips as well.

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