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Altera_Forum's avatar
Altera_Forum
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13 years ago

RAM and FLASH shared bus don't worked

Hello everyone, I developped my own custom board which have MT48LC16M16 (Micron SDRam), S29AL032D (Spansion Flash) and Cyclone III EP3C25. RAM and FLASH share data and address bus. The Flash me...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Hi,

I change the hardware configuration like you said:

Nios Cpu <-->Tristate Bridge<-->CFI. the flash and sdram share a common bus 16 bit data and address

|-> SDRam Controller

I use the nios-command-shell, the results are in the attached file. Please see it!

When I used this configuration working with on-chip memory ram, the program work fine. Then I change booting to SDRam, it can't run. I think that Flash can't boot to RAM or something wrong in declaration. Is there problem when i shared 16 bit common data?

I'm looking foward to hear you soon! Thanks very much!