Quartus Error: Can't place all RAM cells in design - Seeking Help

[ErenYagar]

Hi everyone,

I'm encountering an issue with Quartus where I'm getting the following error:
"Error (170040): Can't place all RAM cells in design
Info (170034): Selected device has 720 memory locations of type M9K. The current design requires 774 memory locations of type M9K to successfully fit.
Info (170033): Memory usage required for the design in the current device: 108% M9K memory block locations required"

I'm using the DE2-150 board and trying to display a 680*480 image. Interestingly, the default example code for DE2-150 works for this resolution, but my custom design is running into this RAM issue.

Also, the default example code uses two ROMs. How can I adapt this to use 680*480 ROMs?

Any help or insights would be greatly appreciated. Thank you!

EP4CGX150DF31C7

[ShengN_Intel]

Hi,

Check this link https://community.intel.com/t5/Intel-Quartus-Prime-Software/A-question-about-the-block-memory/m-p/142932:

M9Ks only has these configurations 

1 bit x 8K addresses 

2 x 4k 

4 x 2k 

8 or 9 x 1k 

16 or 18 x 512 

32 or 36 x 256 

Make sure M9Ks are being used efficiently. Any bits or memory space that cannot be mapped will then be wasted.

For ROM-1 PORT, try to adjust the Set the maximum block depth check this manual link https://faculty-web.msoe.edu/johnsontimoj/EE3921/files3921/ug_ram_rom.pdf (page 13). Probably can help to reduce some of the M9Ks usage. The resource usage box can be checked at the bottom left corner of ROM-1 PORT GUI. The RAM Summary located in Fitter -> Resource Section.

Btw, the DE2-150 design example only consumes 2,664,296 / 6,635,520 ( 40 % ) memory bits and 351 M9Ks.

Thanks,

Best regards,

Sheng

[ShengN_Intel]

Hi,

Do you have any further concern or update?

Thanks,

Best Regards,

Sheng