1. Home
  2. Field-Programmable Gate Arrays
  3. Error using SOPC builder - "Custom SDRAM" with 8-bits gives error with Signal "az_be_n"

Error using SOPC builder - "Custom SDRAM" with 8-bits gives error with Signal "az_be_n"

I'm trying to make a SDRAM controller with SOPC builder, but when I change the data width to 8bits I get the following error..

Warning: Signal "az_be_n" of type "byteenable_n" and width 1 must have width of 2, 4, 8, 16, 32, 64, 128.

I'm trying to make the system for a 64Mb SDR SDRAM, Micron MT48LC8M8A2P-75.

Even when I select the Alliance AS4LC2M8S0-10 chip it does the same thing. So I'm guessing it has to do with a width of 8 bits.

Thank you, Eric

Reply to
sendthis
Loading thread data ...

If this is your own component that you're trying to make up in SOPC Builder, then I think the problem has to do with that the 'byteenable_n' SOPC input is supposed to be a vector. When you have an 8 bit datapath, there will only be one byte enable input which I'm guessing you have defined as a std_logic and not a std_logic_vector.

Wrong: az_be_n: std_logic -- Maps to SOPC's byteenable_n Correct: az_be_n: std_logic_vector(0 downto 0); -- Maps to SOPC's byteenable_n

I'm not totally sure, I haven't used SOPC Builder in a while but I seem to recall an issue like this.

KJ

Reply to
KJ

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.