Hi,
i am quite new to FPGA programming,
and a bit confused about the range for on-chip memory.
In my project i am using an Cyclone IV EP4CE10E22C8N board.
I would like to know now how much memory i can assign in Qsys to my on-chip RAM module.
The total memory size must be less tha the available in the target FPGA.
From the cyclone IV dev handbook i know that the FPGA i use has 414 Kb
organized in M9K memory blocks (so i have 46 M9K blocks)
So i should be able to use slightly less for my RAM if the cpu takes some memory for itself as i read in
http://www.alteraforum.com/forum/showthread.php?t=39788 In qsys my nios processor uses tweo m9k blocks. So i should be able to set up a system with about 45 KB. But compiling
in Quartus i get the error message,
that my design does not fit into the device, so i'm not sure how to calc the max usable memory size.
Also i stumbled over the Mega Wizard Plugin Manager where i can setup my own blocks in quartus.
When i want to create a RAM device there and increase the amount of 32 -bit words (as my nios cpu has a 32 bit data bus) i monitor that the resource usage contains for example 34 luts; 64 M9K blocks and 2 register.
Now i dont really understand how many M9K blocks are there on the FPGA?
Thanks a lot in advance for your answers!
Cheers
Tim
