Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

How can I mux an AvalonMM Bus (VIP_VFR -> 2x SDRAM)

My question is: How I can mux an AvalonMM bus from the FrameReader to access two different SDRAM-modules? The idea I had was to create one bit I connect to a custom-module. By this bit I would ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Ok, I am now again working on this problem and I did not get it to work. Can you please help me again?!

I followed Kevins advise and I am now trying to access the SDRAM by the addresses.

SDRAM_0: 0x000000000 to 0x07fffffff

SDRAM_1: 0x080000000 to 0x0ffffffff

My selfwritten module is connected to both Rams. I have got a 32Bit address std_logic_vector. How can I now access one time the SDRAM_0 and one time the SDRAM_1? Everytime I try to access I only get the data from SDRAM_0. Is there some kind of trick with this? In my opinion the Address Decode Logic wants to fool me, but I did not find the right key to get it properly working.

Thanks for any advise.