[microblaze-uclinux] SDRAM and Flash memories sharing the same pins

[Ronaldo Valiati <rvaliati@xxxxxxxxxx>]

Hi all,

I'm starting in the Microblaze-uClinux world with a custom XC3S1000 
board and in this board the SDRAM and Flash data and address buses share 
the same IO pins in the FPGA. As SDRAM and Flash use different memory 
controllers I need to insert some misc logic to multiplex the signals 
that come from the memories controllers to the external pins. I already 
tried to insert this logic but had some problens with the bidirectional 
data buses from the controllers that can only be associated with 
external pins.
I also tried to work with the Mem_DQ_I,  Mem_DQ_O and  Mem_DQ_T from the 
opc_emc controller but in this case the wrapper generated by the EDK 
fails in the synthesis process.
Did someone already implemented some kind of hardware to share the same 
IO pins to access SDRAM and Flash? I would be very glad in hear some tips.

Thanks and regards,

-- 
Ronaldo Valiati
Engenheiro de Projetos
rvaliati@pd3.com.br
Fone: +55 51 33371227



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